PEN PLOTTER

MP303-UM251-02-9370
PEN PLOTTER
MP303 SERIES
SERVICE MANUAL

MP303-UM-251-9370 i
1. GENERAL DESCRIPTIONS
HISTORY OF REVISIONS
No. Date issued Description of revision Page Edition
1 2004.05.21 First printing All 01
2 2004.12.01 Part numbers for the AC power cables corrected. 9-9 02

MP303-UM-251-9370 ii
CONTENTS
1. GENERAL DESCRIPTIONS
HISTORY OF REVISIONS ...................................................................................................... i
1. GENERAL DESCRIPTION .......................................................................1-1
1.1 Special Features ..................................................................................................... 1-1
1.2 Specifications ......................................................................................................... 1-2
1.3 External Dimensions .............................................................................................. 1-3
2. DESCRIPTION OF PARTS .......................................................................2-1
2.1 Description of Parts ................................................................................................ 2-1
2.2 The Control Panel ................................................................................................... 2-2
3. RECOMMENDED PARTS LIST ...............................................................3-1
4. REPLACING THE MECHANISMS ...........................................................4-1
4.1 Replacing the Rear Cover B .................................................................................. 4-1
4.2 Replacing the Right Cover ..................................................................................... 4-2
4.3 Replacing the Front Cover ..................................................................................... 4-3
4.4 Replacing the Top Left Cover ................................................................................ 4-4
4.5 Replacing the Bottom Left Cover .......................................................................... 4-5
4.6 Replacing the Y Motor Cover ................................................................................. 4-6
4.7 Replacing the Solenoid Cover ............................................................................... 4-7
4.8 Replacing the Y Bar Cover ..................................................................................... 4-8
4.9 Replacing the X Belts ............................................................................................. 4-9
4.10 Replacing the X Motor .......................................................................................... 4-10
4.11 Replacing the Y Bar .............................................................................................. 4-11
4.12 Replacing the Y Belt ............................................................................................. 4-12
4.13 Replacing the Y Motor .......................................................................................... 4-13
4.14 Replacing the Y FPC Cable .................................................................................. 4-14
4.15 Replacing the Pen Solenoid ................................................................................ 4-15
4.16 Removing the Bottom Panel Assembly .............................................................. 4-16
5. MECHANICAL ADJUSTMENTS ..............................................................5-1
5.1 Adjusting the X Belt Tension ................................................................................. 5-1
5.2 Adjusting the Y Belt Tension ................................................................................. 5-2
5.3 Adjusting the Y Bar Height .................................................................................... 5-3

MP303-UM-251-9370 iii
1. GENERAL DESCRIPTIONS
5.4 Checking the Perpendicularity Precision ............................................................. 5-4
5.5 Adjusting the Perpendicularity Precision ............................................................ 5-5
5.6 Adjusting the X Rollers .......................................................................................... 5-6
5.7 Adjusting the Pen Holder and Pivot Screws ........................................................ 5-7
5.8 Adjusting the Pen Holder Height ........................................................................... 5-8
5.9 Adjusting the Pen UP Spring ................................................................................. 5-9
5.10 Adjusting the X Home Position ........................................................................... 5-10
5.11 Adjusting the Y Home Position ........................................................................... 5-11
5.12 Adjusting Pen Retrieval ....................................................................................... 5-12
6. ELECTRICAL ADJUSTMENTS ................................................................6-1
6.1 Wiring Diagrams ..................................................................................................... 6-1
6.1.1 Component Layout on the Main Board .........................................................................6-2
6.2 DIP Switch Settings ................................................................................................ 6-3
6.3 Checking the Voltage Level for the Main Board .................................................. 6-4
6.4 Updating the System Firmware ............................................................................. 6-5
6.5 NOV-RAM Clear ....................................................................................................... 6-6
6.6 Adjusting the Pen Force ........................................................................................ 6-7
6.7 Using the Test Modes ............................................................................................. 6-8
6.7.1 Self Test ...........................................................................................................................6-8
6.7.2 Character Dump Mode ...................................................................................................6-9
6.7.3 Debug Mode ..................................................................................................................6-10
6.7.4 Pen Retrieval Test Mode ...............................................................................................6-11
6.7.5 Running Test Mode .......................................................................................................6-12
6.7.6 Sensor Test Mode .........................................................................................................6-13
6.7.7 Control Panel Key Test Mode ......................................................................................6-15
7. TROUBLESHOOTING ..............................................................................7-1
7.1 The Plotter is Turned On But Doesn’t Operate .................................................... 7-1
7.2 During Plotting Operations .................................................................................... 7-1
8. ERROR MESSAGES ................................................................................8-1
8.1 Hardware Error ........................................................................................................ 8-1
8.2 GP-GL Command Errors ........................................................................................ 8-1
8.3 HP-GL Command Errors ........................................................................................ 8-2

MP303-UM-251-9370 iv
1. GENERAL DESCRIPTIONS
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS ...................................9-1
9.1 Main Unit .................................................................................................................. 9-1
9.2 External Casing ....................................................................................................... 9-2
9.3 Control Panel Section ............................................................................................ 9-3
9.4 Bottom Panel ........................................................................................................... 9-4
9.5 X-Axis Slider, X-Axis Drive, Pen Station ............................................................... 9-5
9.6 Y-Axis Slider, Y-Axis Drive ..................................................................................... 9-7
9.7 Standard Accessories ............................................................................................ 9-9
9.8 Others ...................................................................................................................... 9-9
10. CIRCUIT DIAGRAMS .............................................................................10-1
10.1 Main Board ............................................................................................................ 10-1
Main board (Top) ........................................................................................................................10-1
Main board (Connections) .........................................................................................................10-2
Main board (CPU) .......................................................................................................................10-3
Main board (DC Driver) ..............................................................................................................10-4
Main board (GRC1507 Servo) ...................................................................................................10-5
Main board (I/F) ..........................................................................................................................10-6
Main board (Memory) .................................................................................................................10-7
Main board (USB) .......................................................................................................................10-8
10.2 Control Panel ........................................................................................................ 10-9
10.3 Relay Board ......................................................................................................... 10-10
10.4 High Voltage Power Board ................................................................................. 10-11

1. GENERAL DESCRIPTION
1.1 Special Features
• High-speed, high-quality plotting
MP303-UM-251-9370 1-1
1. GENERAL DESCRIPTION
A digital servo drive system and a 32-bit CPU combine to produce detailed plots with smooth curves at a
maximum plotting speed of 700 mm/s (in all directions) and a mechanical resolution of 0.005 mm.
• Various functions ensure clearly-defined plots
A wide variety of functions come standard to ensure clearly-defined plots, including the Auto Pen Cap
function which prevents pens at the pen station from drying up when not in use and a mechanical soft-landing
mechanism that extends the pen's lifetime while providing a quieter working environment. The plotting speed
and pen force most suitable for the pen type being used can be easily selected from the control panel.
• Upright installation possible
To conserve space, the plotter can be mounted on a pair of stands (provided as a standard accessory) for
installation at a 60˚ angle.
• Interface conditions are easily set
The interface mode (RS-232C serial or Centronics parallel or USB-compatible) is automatically selected
when the plotter is connected to a computer via the respective interface connector.
If the plotter is set to Auto RS-232C mode, you just need to send plot data from the computer; the RS-232C
settings are automatically selected so no bothersome settings are required.
• Interactive operation
Various functions can be set interactively by using the panel keys according to messages and prompts
appearing on the display.
• Vector sorting function
This function speeds up plotting by minimizing the distance the pen travels in raised status from the end point
of one line to the starting point of the next line.
• Pen sorting function
To speed up plotting by reducing the number of pen exchanges required, this function reorganizes the
sequence in which plotting is performed so that each color is completely plotted before selecting the next
pen.

MP303-UM-251-9370 1-2
1. GENERAL DESCRIPTION
1.2 Specifications
Model no. MP303-04
CPU 32-bit CPU
Configuration Flatbed type
Drive system Digital servo
Effective plotting area EXPAND : 432 x 297 mm (17.0 x 11.7 in)
ANSI B : 416 x 268 mm (16.3 x 10.5 in)
ISO A3 : 404 x 285 mm (15.9 x 11.2 in)
ISO A4 : 281 x 198 mm (11.1 x 7.8 in)
Maximum plot speed 70 cm/s
Mechanical resolution 0.005 mm (.0019 in)
Programmable resolution GP-GL mode : 0.1/0.025 mm (.004/.001 in)
HP-GL mode : 0.025 mm (.001 in)
No. of pens 8
Compatible ink pen types Water based fiber-tip pens,
Disposable ink pens (0.2, 0.3, 0.5, 0.7 mm),
Refillable ink pens (0.2, 0.3, 0.5 mm),
Ceramic pens (0.2, 0.3, 0.5, 0.7 mm)
Chart hold method Electrostatic adhesion
Accuracy Distance : within ±0.3% or ±0.1 mm, whichever is larger
Repeatability : within 0.1 mm
Perpendicularity : within 1.0 mm/297 mm
Pen exchange : within 0.3 mm
Interfaces RS-232C/Centronics/USB1.1
Command sets GP-GL (MP-GL and FP-GL)
HP-GL (HP7475 emulation)
Display panel LCD (8 characters x 2 lines)
Buffer memory 2 Mbytes
Power supply 100 to 240 VAC ±10% 50/60 Hz
Power consumption Within 45 VA
Operating environment Temperature : +5˚C to +35˚C
Humidity : 35% to 75% RH
External dimensions 670 mm (W) x 449 mm (D) x 130 mm (H)
Weight Approx. 6.2 kg

1.3 External Dimensions
MP303-UM-251-9370 1-3
1. GENERAL DESCRIPTION

2. DESCRIPTION OF PARTS
2.1 Description of Parts
MP303-UM-251-9370 2-1
2. DESCRIPTION OF PARTS
(1) Pen station
Holds pens ready for use and is numbered consecutively from pen 1 through pen 8, from the bottom to the
top.
(2) Control panel
Contains the keys used for controlling the plotter’s operations and the lamps which indicate the current
plotter status.
(3) Pen carriage
Holds the currently selected pen.
(4) Y bar
This sliding bar travels in the X-axis direction to move the pen carriage and enable plotting.
(5) Writing panel
Holds the paper using an electrostatic adhesion panel.
(6) Display
Liquid-crystal display allows functions to be set interactively.
(7) AC inlet
Plug the AC adapter into this AC line inlet.
(8) Power switch
This switch controls the ON/OFF status of the plotter’s power supply.
(9) RS-232C connector
To use the RS-232C serial interface, connect your computer to the plotter via this connector.
(10) Centronics connector
To use the Centronics-compatible parallel interface, connect your computer to the plotter via this connector.
(11) USB connector
To use the USB interface, connect your computer to the plotter via this connector.

2.2 The Control Panel
Keys
POSITION ................. Move the pen carriage in the direction indicated by each key.
These keys are also used to set functions at the display.
ENTER ...................... Completes input of the function being set.
PAUSE ...................... Press to temporarily stop plotting and press again to resume plotting.
MP303-UM-251-9370 2-2
2. DESCRIPTION OF PARTS
CANCEL .................... To cancel a setting shown on the display, press this key instead of the ENTER key.
MODE ....................... Press to use the POSITION keys to move the pen carriage or to set function menus.
LEDs
CHART HOLD ........... Switches the ON/OFF status of electrostatic adhesion. After placing a sheet on the
writing panel, press this key to secure the paper.
POWER/PROMPT .... Lights when the power is turned on.
Flickers to prompt you to press the ENTER key or to inform you that an error has
occurred.
PAUSE ...................... Lights to indicate that plotting is temporarily suspended.

MP303-UM-251-9370 3-1
2. Description of Parts
3. RECOMMENDED PARTS LIST
No. Part No. Part Name Description Quantity Remarks
1 035130123 Electrostatic Panel 1 Compatible with MP5300
2 773513500 High Voltage Board 1 Compatible with MP5300
3 618260300 Control Panel PR312003 1
4 500051951 AC Adapter SA45-3129 1
5 771826500 Main Board 303 1
6 773513490 Control Board 1 Compatible with MP5300
7 691801540 Keyboard Flexible Printed Cable FPC,05412 1 Compatible with MP5300
8 509000014 X Motor TS3747N31ES 1 Compatible with MP5300
9 035132210 X Belt 1820 2 Compatible with MP5300
10 773513080 Relay Board PR05406 1 Compatible with MP5300
11 508000015 X Home Sensor GP1A53HR 1 Compatible with MP5300
12 508102285 Y Home Sensor SW,SPPB/TYPE1 1 Compatible with MP5300
13 691801520 X Flexible Printed Cable FPC,05410 1 Compatible with MP5300
14 795320716 Pen Station 1 Compatible with MP5300
15 035033051 Y Belt 1 Compatible with MP5300
16 509000015 Y Motor TS3747N32ES 1 Compatible with MP5300
17 773513100 Pen Holder Assembly 1 Compatible with MP5300
18 509000035 Solenoid 1 Compatible with MP5300
19 035134081 Y Roller 10B 3 Compatible with MP5300
20 035132070 Y Roller B 1 Compatible with MP5300
21 105401090 Pen Flexible Printed Cable FPC,05401 1 Compatible with MP5300

4. REPLACING THE MECHANISMS
4.1 Replacing the Rear Cover B
Disassembly
(1) Move the Y bar next to the pen station as shown in Fig. 4-1.
Fig. 4-1
MP303-UM-251-9370 4-1
4. REPLACING THE MECHANISMS
(2) Place the plotter upside down on a table or other flat surface as shown in Fig. 4-2, making sure not to
strike the Y bar or pen block against the surface.
Fig. 4-2
(3) After removing the three M3 x 8 mm tapping screws and two M3 x 8 mm binding-head screws, remove
the rear cover B (see Fig. 4-3).
Fig. 4-3
Re-assembly
(4) Attach the rear cover B by performing the above “Disassembly” procedure in reverse.
Tightening torque: 4 kg / cm (M3 x 8 binding-head screws only)

4.2 Replacing the Right Cover
MP303-UM-251-9370 4-2
4. REPLACING THE MECHANISMS
Disassembly
(1) Loosen the three M3 x 8 mm tapping screws securing the right cover, then remove one M3 x 8 mm
binding-head screw from the rear cover B.
(2) Remove the right cover while turning it slightly toward you (see Fig. 4-4) to release its three hooks (see
Fig. 4-5).
Fig. 4-4
Fig. 4-5
Re-assembly
(3) To attach the right cover, insert its three hooks into the holes provided and then perform the above
“Disassembly” procedure in reverse.

4.3 Replacing the Front Cover
Disassembly
(1) Remove the right cover.
(2) Remove the three M3 x 8 mm tapping screws.
(3) Slide off the front cover as shown in Fig. 4-6.
Fig. 4-6
Re-assembly
(4) To attach the front cover, perform the above “Disassembly” procedure in reverse.
MP303-UM-251-9370 4-3
4. REPLACING THE MECHANISMS

4.4 Replacing the Top Left Cover
MP303-UM-251-9370 4-4
4. REPLACING THE MECHANISMS
Disassembly
(1) Remove the black M3 x 12 mm tapping screw from the bottom of the top left cover (see Fig. 4-7).
(2) Remove the two M3 x 8 mm tapping screws from the top of the top left cover (see Fig. 4-7).
(3) Disconnect the flat cable, then remove the top left cover.
Top Left Cover
M3 x 8 mm
tapping screw
M3 x 12 mm tapping screw
Fig. 4-7
Re-assembly
(4) To attach the top left cover, perform the above “Disassembly” procedure in reverse.

4.5 Replacing the Bottom Left Cover
MP303-UM-251-9370 4-5
4. REPLACING THE MECHANISMS
Disassembly
(1) From the bottom panel, remove the six M3 x 8 mm tapping screws, and two black M3 x 5 mm tapping
screws (see Fig. 4-8).
Bottom panel M3 x 5 tapping screw
M3 x 8 tapping screw
Fig. 4-8
(2) Remove the one M3 x 8 mm tapping screw from the rear cover B, then remove the bottom left cover (see
Fig. 4-9).
M3 x 8 tapping screw
Fig. 4-9
Bottom left cover
Re-assembly
Caution: Be sure not to mix up the screws when replacing them.
Insertion of the wrong screws will damage the circuitry.
(3) To attach the bottom left cover, perform the above “Disassembly” procedure in reverse.

4.6 Replacing the Y Motor Cover
MP303-UM-251-9370 4-6
4. REPLACING THE MECHANISMS
Disassembly
(1) Remove the two black M3 x 12 mm binding-head screws, then remove the Y motor cover (see Fig.
4-10).
M3 x 12 mm
binding head screw
Y bar
Fig. 4-10
Y motor cover
(2) To attach the Y motor cover, perform the above “Disassembly” procedure in reverse.

4.7 Replacing the Solenoid Cover
MP303-UM-251-9370 4-7
4. REPLACING THE MECHANISMS
Disassembly
(1) Remove the two M2 x 6 mm binding-head screws, then remove the solenoid cover (see Fig. 4-11).
M2 x 6 mm binding head screw
Y bar
Fig. 4-11
Solenoid cover
(2) To attach the solenoid cover, perform the above “Disassembly” procedure in reverse.
Caution: Ensure that the solenoid cover does not contact the Y bar.
Fig. 4-12 shows an example of an incorrectly attached solenoid cover.
Y bar
NG
Fig. 4-12
Solenoid cover

4.8 Replacing the Y Bar Cover
MP303-UM-251-9370 4-8
4. REPLACING THE MECHANISMS
Disassembly
(1) Place an A3 size sheet of paper on the plotter’s writing panel to avoid scratching it.
(2) Remove the two black M3 x 12 mm tapping screws securing the Y bar cover (see Fig. 4-13), then
remove the Y bar cover.
Y bar
M3 x 12 mm black
tapping screw
Fig. 4-13
Re-assembly
(3) To attach the Y bar cover, perform the above “Disassembly” procedure in reverse.

4.9 Replacing the X Belts
MP303-UM-251-9370 4-9
4. REPLACING THE MECHANISMS
After the X belts are replaced, the X belt tension and perpendicularity precision must be adjusted.
Disassembly
(1) Remove the rear cover B, right cover, front cover, and top left cover.
(2) Loosen the two M3 x 6 mm binding-head screws securing the tension bracket (see Fig. 4-14) to loosen
the X belt.
(3) Remove the X belts.
Tension bracket
Fig. 4-14 Fig. 4-15
18 to 20 mm
(Protruding length of X belt)
Re-assembly
(4) Pull both ends of each X belt to the length indicated in Fig. 4-15.
(5) Attach the X belts to the corresponding pulleys.
(6) Adjust the X belt tension (see Section 5.1, “Adjusting the X Belt Tension”).
(7) Adjust the perpendicularity precision (see Section 5.5, “Adjusting the Perpendicularity Precision”).

4.10 Replacing the X Motor
MP303-UM-251-9370 4-10
4. REPLACING THE MECHANISMS
After the X motor is replaced, the X belt tension and perpendicularity precision must be adjusted.
Disassembly
(1) Remove the X belts.
(2) Remove the bottom panel assembly and bottom left cover.
(3) Disconnect the X motor cable from the main driver board.
(4) Loosen the two M3 x 4 mm double-point screws from the coupling of the M shaft (see Fig. 4-16).
Double-point screw
Fig. 4-16
X-motor
Coupling
M shaft
(5) Remove the two M3 x 6 mm binding-head screws securing the X motor, then slide off the X motor.
(6) Remove the drive pulley from the X motor.
Re-assembly
Caution: The double-point screws in the X drive shaft’s coupling are easily breakable and should
be tightened with care.
The tightening torque must not exceed 2 kg / cm.
(7) To mount the X motor, perform the above “Disassembly” procedure in reverse.
(8) Mount the X belts.
(9) Adjust the X belt tension (see Section 5.1, “Adjusting the X Belt Tension”).
(10) Adjust the perpendicularity precision (see Section 5.5, “Adjusting the Perpendicularity Precision”).

4.11 Replacing the Y Bar
MP303-UM-251-9370 4-11
4. REPLACING THE MECHANISMS
After the Y bar is replaced, the Y bar height, Y belt tension and perpendicularity precision must be adjusted.
Disassembly
(1) Remove the Y motor cover.
(2) Remove the Y bar cover.
(3) Loosen the two black M3 x 4 mm binding-head screws securing the Y pulley bracket (see Fig. 4-17).
Y bar cover
Fig. 4-17
M3 x 4 mm binding head screw
(4) Remove the rubber holder securing the pen FPC (Flexible Printed-Circuit) cable to the X roller bracket,
then disconnect the Y FPC cable from the relay board and separate it from the X slider.
(5) Remove the Y belt (see Section 4.12, “Replacing the Y Belt”).
(6) Remove the two M3 x 12 mm tapping screws securing the Y bar to the X slider, then remove the Y bar (see
Fig. 4-18).
Fig. 4-18
Rubber holder
M3 x 12 mm
tapping screw
(7) Slide the pen block assembly off the Y bar.
(8) Slowly peel the Y FPC cable off the Y bar, being careful not to damage the cable.
Re-assembly
(9) To mount the Y bar, perform the above “Disassembly” procedure in reverse.
(10) Adjust the Y bar height (see Section 5.3, “Adjusting the Y Bar Height”) so that the gap between the Y
bar and X rail is about 11.6 mm.
(11) Adjust the perpendicularity precision (see Section 5.5, “Adjusting the Perpendicularity Precision”).
(12) Adjust the Y belt tension (see Section 5.2, “Adjusting the Y Belt Tension”).

4.12 Replacing the Y Belt
After the Y belt is replaced, the Y belt tension and X rollers must be adjusted.
MP303-UM-251-9370 4-12
4. REPLACING THE MECHANISMS
Disassembly
(1) Loosen the M3 x 6 mm tapping screw at the X roller adjustment bracket (see Fig. 4-19).
(2) Remove the two black M3 x 4 mm binding-head screws securing the Y pulley bracket, then remove the
Y pulley bracket.
(3) While slightly raising the Y bar toward you, slide the Y slider assembly off the Y bar (making sure not to
damage the Y FPC cable).
(4) Remove the Y belt from the Y slider (see Fig. 4-20).
X slider
Y bar
Y belt
X roller adjustment bracket
Fig. 4-19 Fig. 4-20
Re-assembly
(5) Attach the Y belt to the Y slider.
(6) Mount the Y slider and Y pulley bracket onto the Y bar.
(7) Adjust the Y belt tension (see Section 5.2, “Adjusting the Y Belt Tension”).
(8) Attach the Y bar cover.
(9) Adjust the X rollers (see Section 5.6, “Adjusting the X Rollers”).
Note: Check the Y FPC cable to ensure that it is undamaged.
Y slider

4.13 Replacing the Y Motor
MP303-UM-251-9370 4-13
4. REPLACING THE MECHANISMS
After the Y motor is replaced, the X rollers, X belt tension, and Y belt tension must be adjusted. Next, run the
pen retrieval test to check that pens are properly exchanged.
Disassembly
(1) Remove the rear cover B and Y motor cover.
(2) Remove the relay board, then disconnect the Y motor cable from the relay board.
(3) Remove the top left cover, then push the X slider as far as possible in the -X axis direction (near the pen
station).
(4) Remove the Y bar cover.
(5) Remove the X belt closer to the back of the plotter.
(6) Loosen the Y belt.
(7) Remove the two M3 x 6 mm tapping screws securing the X roller adjustment bracket assembly, remove
the X roller adjustment bracket assembly (see Fig. 4-21), then shift the entire Y bar assembly in the +Y
direction.
Note: Be careful not to scratch the X rail.
X slider
Fig. 4-21
Y bar
X roller adjustment bracket
(8) Remove the two M3 x 6 mm binding-head screws securing the Y motor, then remove the Y motor.
(9) Remove the Y drive pulley from the Y motor.
Re-assembly
(10) To mount the Y motor, perform the above “Disassembly’’ procedure in reverse.
(11) Adjust the X rollers (see Section 5.6, “Adjusting the X Rollers”).
(12) Adjust the Y belt tension (see Section 5.2, “Adjusting the Y Belt Tension’).
(13) Adjust the X belt tension (see Section 5.1, “Adjusting the X Belt Tension”).
(14) Run the pen retrieval test to check that pens are properly exchanged (see Section 6.7 , “The Test
Modes”).

4.14 Replacing the Y FPC Cable
MP303-UM-251-9370 4-14
4. REPLACING THE MECHANISMS
After the Y motor is replaced, the Y bar height and perpendicularity precision must be adjusted.
Disassembly
(1) Disconnect the Y FPC cable from connector J2 on the relay board.
(2) Remove the Y bar.
(3) Remove the M2 x 6 mm binding-head screw securing the Y FPC cable to the Y slider (see Fig. 4-22),
then use a soldering iron to detach the pen solenoid’s lead wires from the Y FPC cable.
Y FPC cable
Fig. 4-22
Y slider
(4) Slide the Y slider assembly off the Y bar.
(5) Remove the Y FPC holder bracket (which is secured by black adhesive).
(6) Peel the Y FPC cable off the Y bar.
Re-assembly
(7) Fold the Y FPC cable as shown in Fig. 4-23, and wrap a piece of filament tape (about 25 mm long)
around the folded section. Attach the Y FPC cable to the Y bar with double-sided tape as shown in Fig.
4-24. To prevent the folded section of the Y FPC cable from lifting up, attach a piece of filament tape as
shown in Fig. 4-25.
Y FPC cable
15 mm
Range of double-sided tape
Y bar
Black line
Fold here
Fold here
Fig. 4-23
Wrap with filament tape
About 25 mm
Align the double-sided tape’s edge
with the Y bar’s edge
Filament tape
15 mm
5 to 8 mm
Wrap filament tape around
the section indicated above
Fig. 4-24 Fig. 4-25
(8) Process the Y FPC cable as shown in Fig. 4-26.

90˚
+2 0
Align the FPC cable’s edge
with the top of the rib
Apply adhesive to
inside of bracket
Fig. 4-26
MP303-UM-251-9370 4-15
The cable should contact the
pins at the circuit board’s edge
* Make sure the Y FPC holder is not
loose or tilted.
4. REPLACING THE MECHANISMS
(9) To mount the Y FPC cable, perform the preceding “Disassembly” procedure in reverse.
(10) Adjust the Y bar height (see Section 5.3, “Adjusting the Y Bar Height’).
(11) Adjust the perpendicularity precision (see Section 5.5, “Adjusting the Perpendicularity Precision”).
4.15 Replacing the Pen Solenoid
After the pen solenoid is replaced, the pen force must be adjusted.
Disassembly
(1) Remove the solenoid cover.
(2) Remove the M2 x 6 mm binding-head screw securing the Y FPC cable to the Y slider.
(3) Remove the two M3 x 6 mm binding-head screws securing the pen solenoid to the Y slider (see Fig.
4-27).
Fig. 4-27
M3 x 6 mm
binding head screw
Pen solenoid
(4) Use a soldering iron to remove the solder between the Y FPC cable and the pen solenoid, then remove
the pen solenoid.
Re-assembly
(5) To mount the pen solenoid, perform the above “Disassembly” procedure in reverse.
(6) Adjust the pen force (see Section 6.6, “Adjusting the Pen Force”).

4.16 Removing the Bottom Panel Assembly
Disassembly
(1) Push the Y bar next to the pen station as shown in Fig. 4-28.
Fig. 4-28
MP303-UM-251-9370 4-16
4. REPLACING THE MECHANISMS
(2) Place the plotter upside down on a table or other flat surface as shown in Fig. 4-29, making sure not to
strike the Y bar or pen block against the surface.
(3) Remove the six M3 x 8 mm tapping screws and two M3 x 5 mm tapping screws securing the bottom
panel assembly (see Fig. 4-29), then remove the bottom panel assembly.
Caution: Be sure not to mix up the screws when replacing them.
Insertion of the wrong screws will damage the circuitry.
M3 x 5 tapping screw
M3 x 8 tapping screw
Fig. 4-29
Bottom panel
(4) Disconnect all the FPC cables, connector cables, etc. from the main board.

5. MECHANICAL ADJUSTMENTS
5.1 Adjusting the X Belt Tension
MP303-UM-251-9370 5-1
5. MECHANICAL ADJUSTMENTS
(1) Remove the rear cover B, right cover, and front cover.
(2) Push the Y bar to the left next to the pen station.
(3) Remove the two black M3 x 12 mm binding-head screws from the Y motor cover and insert one into each
tension bracket as shown in Fig. 5-1. Next, loosen the two M3 x 6 mm binding-head screws (with plain
washer) at each tension bracket by about a half turn.
(4) To adjust the X belt tension, adjust the position of the tension brackets using the screws added in Step (3)
so that, when a tension gauge (150 g maximum) is used to cause a 10 mm displacement in the X belt at
the position indicated in Fig. 5-2, the force becomes 100 g (±20 g).
Adhesive
Tension pulley
10 mm
Fig. 5-1
Insert here: M3 x 12 mm
binding head screw
Tension bracket
277 mm
Fig. 5-2
(5) After adjustment is completed, tighten the two M3 x 6 mm binding head screws (with plain washer) at
each tension bracket and secure them with adhesive, then remove the M3 x 12 mm binding head screw
inserted in each tension bracket in Step (3) and replace them in the Y motor cover.
(6) Attach the rear cover B, right cover, and front cover.

5.2 Adjusting the Y Belt Tension
MP303-UM-251-9370 5-2
5. MECHANICAL ADJUSTMENTS
(1) Remove the Y bar cover.
(2) Loosen the two M3 x 4 mm binding-head screws securing the Y pulley bracket by about a half turn (see
Fig. 5-3).
(3) To adjust the Y belt tension, pull the Y pulley bracket using a push-pull gauge and then tighten the screws
loosened in Step (2) at the point where the pull force becomes 1000 g (±100 g).
Y bar cover
(4) Attach the Y bar cover.
Y bar
Fig. 5-3
M3 x 4 mm binding head screws

5.3 Adjusting the Y Bar Height
MP303-UM-251-9370 5-3
5. MECHANICAL ADJUSTMENTS
After the Y bar height is adjusted, the perpendicularity precision must be adjusted.
(1) Loosen the two M3 x 12 mm tapping screws securing the X slider to the Y bar as shown in Fig. 5-4.
(2) Adjust the gap between the Y bar and X slider to about 11.6 mm, then tighten the two screws loosened in
Step (1) while making sure that the Y bar is not tilted.
Fig. 5-4
(3) Adjust the perpendicularity precision (see Section 5.5, “Adjusting the Perpendicularity Precision”).

5.4 Checking the Perpendicularity Precision
MP303-UM-251-9370 5-4
5. MECHANICAL ADJUSTMENTS
(1) Attach a 0.2 mm ceramic pen and load a sheet of thin paper.
(2) Lower the pen and use the POSITION keys to manually plot the quadrilateral shape shown in Fig. 5-5.
(3) As shown in Fig. 5-6, fold the sheet in half so that the X-axis lines overlap.
Check the perpendicularity precision based on whether or not Line B deviates from Line A.
Line A
Line B
Align both lines
Fig. 5-5 Fig. 5-6
(4) If Line B deviates from Line A when the paper is folded so that both X-axis lines overlap (see Fig. 5-7),
tilt the Y bar toward Line B at half the angle of such deviation.
Line B
Line A
Fig. 5-7
Line B
Line A

5.5 Adjusting the Perpendicularity Precision
MP303-UM-251-9370 5-5
5. MECHANICAL ADJUSTMENTS
After the perpendicularity precision is adjusted, the X rollers must be adjusted.
(1) Remove the Y motor cover and rear cover B.
(2) Remove the top left cover, then loosen the two M3 x 4 mm double-point screws in the coupling (see Fig.
5-8) to free the M shaft.
X motor
Fig. 5-8 Fig. 5-9
Coupling
Double-point screw
M shaft
(3) Loosen the two M4 x 6 mm toothed binding head screws securing the X roller bracket to the X slider (see
Fig. 5-10).
M4 x 6 mm toothed binding-head screws
Fig. 5-10
(4) Slide the Y bar assembly so that it is parallel to the right edge of the writing panel, then tighten the two
M4 x 6 mm toothed binding head screws.
(5) Adjust the X rollers (see Section 5.6, “Adjusting the X Rollers”).
(6) Tighten the two M3 x 4 mm double-point screws in the coupling, making sure that the torque does not
exceed 2 kg/cm.
(7) Check the perpendicularity precision (see Section 5.4, “Checking the Perpendicularity Precision”).
If the perpendicularity precision is unsatisfactory, repeat Steps (2) and (3) above and finely adjust the
position of the Y bar assembly in the direction of deviation, repeat Steps (5) and (6), then check the
perpendicularity precision again. When the precision is satisfactory, proceed to Step (8) below.
(8) Attach the Y motor cover and rear cover B.
(9) Attach the top left cover.

5.6 Adjusting the X Rollers
MP303-UM-251-9370 5-6
5. MECHANICAL ADJUSTMENTS
(1) Remove the Y motor cover and rear cover B.
(2) Loosen the two M3 x 6 mm tapping screws securing the X roller adjustment bracket.
(3) While pulling the X roller adjustment bracket and X slider by a pull force of about 600 to 700 g in the
directions shown in Fig. 5-11, adjust the pressure exerted by the X rollers. Tighten the two M3 x 6 mm
tapping screws.
Manually turn the X slider’s rollers one at a time to check that all rollers exert the same pressure. If
pressure is uneven, adjust the perpendicularity precision (see Section 5.5, “Adjusting the Perpendicularity
Precision”).
Fig. 5-11
(4) Attach the Y motor cover and rear cover B.

5.7 Adjusting the Pen Holder and Pivot Screws
MP303-UM-251-9370 5-7
5. MECHANICAL ADJUSTMENTS
After the pen holder and pivot screws are adjusted, the Y belt tension must be adjusted.
(1) Remove the solenoid cover.
(2) Remove the Y bar cover and Y pulley bracket, then remove the Y slider assembly from the Y bar by
sliding it in the -Y direction.
(3) As shown in Fig. 5-13, turn the pivots to adjust both gaps between the pen holder and Y slider to the
same distance (about 2 mm).
2 mm
Apply adhesive
Apply adhesive
Pivot screw
2 mm 2 mm
Pen holder
Tightening torque:
50 to 70 gf/cm
Fig. 5-12 Fig. 5-13
(4) Check that there is no play in the pen holder.
(5) Remove the pen UP spring, manually raise the pen holder, then check that the pen holder lowers
smoothly when released (see Fig. 5-14).
When the pen holder is released
If the pen holder doesn’t lower
completely, loosen the pivot screw
Fig. 5-14
(6) Tighten the nut of each pivot screw, then secure the screws with adhesive.
(7) Slide the Y slider assembly onto the Y bar and attach it.
(8) Attach the solenoid cover and Y pulley bracket.
(9) Adjust the Y belt tension (see Section 5.2, “Adjusting the Y Belt Tension”).
(10) Attach the Y bar cover.

5.8 Adjusting the Pen Holder Height
MP303-UM-251-9370 5-8
5. MECHANICAL ADJUSTMENTS
(1) Attach a pen to the pen holder and raise the pen.
(2) Use the M3 x 4 mm hexagonal adjustment screw to adjust distance A between the raised pen’s tip and
writing panel surface to 1.8 mm minimum (2.6 mm maximum).
Be sure to measure the minimum and maximum distances throughout the entire writing panel’s surface.
A
Pen holder
Adhesive
Adjustment screw
Top surface of the writing panel
Fig. 5-15
(3) When adjustment is completed, apply adhesive to the adjustment screw.

5.9 Adjusting the Pen UP Spring
MP303-UM-251-9370 5-9
5. MECHANICAL ADJUSTMENTS
After the pen UP spring is adjusted, the pen force must be adjusted.
(1) Remove the solenoid cover.
(2) Attach a pencil plunger to the pen holder.
(3) Lower the pencil plunger slightly (0.5 to 1.0 mm) below the pen UP position, and temporarily loosen the
pen force adjustment screw at that position.
(4) Gradually tighten the pen force adjustment screw until the pencil plunger reaches the pen UP position,
then apply adhesive to the pen force adjustment screw as shown in Fig. 5-16.
Fig. 5-16
(5) Attach the solenoid cover.
(6) Adjust the pen force (see Section 6.6, “Adjusting the Pen Force”).
Apply adhesive here

5.10 Adjusting the X Home Position
MP303-UM-251-9370 5-10
5. MECHANICAL ADJUSTMENTS
(1) Remove the top left cover.
(2) Loosen the two M3 x 6 mm binding head screws (with plain washer).
(3) Adjust the X home position by sliding the X limiter bracket in the directions shown in Fig. 5-17.
(4) Attach the top left cover.
Fig. 5-17

5.11 Adjusting the Y Home Position
MP303-UM-251-9370 5-11
5. MECHANICAL ADJUSTMENTS
(1) Adjust the Y home position by turning the M3 x 6 mm hexagonal bolt as shown in Fig. 5-18, then apply
adhesive to that bolt.
3.9 mm
Adhesive
Fig. 5-18

5.12 Adjusting Pen Retrieval
MP303-UM-251-9370 5-12
5. MECHANICAL ADJUSTMENTS
Before attempting to adjust pen retrieval, check the perpendicularity precision (see Section 5.4, “Checking
the Perpendicularity Precision”) and adjust it if necessary (see Section 5.5, “Adjusting the Perpendicularity
Precision”).
(1) Remove the top left cover.
(2) If the Y bar is not parallel to the pen station, move the Y bar so that it is parallel.
(3) Set the plotter to pen retrieval test mode by holding down the LEFT ARROW (-X) and DOWN ARROW (-Y)
POSITION keys while turning on the plotter.
(4) Adjust the X and Y home positions (see Sections 5.10, “Adjusting the X Home Position,” and 5.11,
“Adjusting the Y Home Position”) to positions where the pen retrieval test can be enabled.
(5) Mount disposable ink pens in Positions 1 to 8 of the pen station.
(6) Press the ENTER key to start the pen retrieval test and check the following points:
• The ink pen plunger does not contact the pen holder.
• The pen tip does not touch the pen cap (see Fig. 5-19). If the pen tip touches the pen cap, loosen the
two M3 x 12 mm tapping screws, raise the pen station and then tighten the two screws. If raising the
pen station does not solve the problem, add a plain washer of 3 mm diameter and 0.5 mm thickness
beneath the pen station mounting bracket (see Fig. 5-20).
Incorrect Correct
Add the washer here
Fig. 5-19 Fig. 5-20
Note: Execution of the pen retrieval test can be temporarily suspended by pressing the PAUSE
or ENTER key. To resume test execution, press the PAUSE or ENTER key
(7) Attach the top left cover.

MP303-UM-251-9370 5-13
5. MECHANICAL ADJUSTMENTS

6. ELECTRICAL ADJUSTMENTS
6.1 Wiring Diagrams
JOINT BOARD
1
2
CA, 05405
Y HOME
SENSOR
J1
ASSY : CA, 05410
Y MOTOR
FPC, 05410
J3
X MOTOR
J2
SOLENOID
J119-190
MP303-UM-251-9370 6-1
FPC, 05401
PR, 05406A
J5
SW2
J8
RS-232C
AC ADAPTER
SJ-W2R4A-30BB
9
2
1
3
-
5
4
A
S
J3
J2
J6
HIGH VOLTAGE
BOARD
CA, 05406A
J4
J7
CENTRONICS
WRITING PANEL
PR, 05407
J9
DEBUG BOARD
LCD
CA312001
6. ELECTRICAL ADJUSTMENTS
J11
J10
USB
J1
PR31200A
MAIN BOARD
KEY BOARD
PR312003

6.1.1 Component Layout on the Main Board
J10
SW1
JP2
J7
J6
J2
JP3
J8
MP303-UM-251-9370 6-2
J5
TP3
6. ELECTRICAL ADJUSTMENTS
J1
J11
JP4
J8
JP6
JP5
TP2 (12V)
J4
VR1
TP1 (24V)
J9
TP3
SW2

6.2 DIP Switch Settings
Factory presets (Normal Mode)
SW1
1 2 3 4
NOV-RAM Clear mode
SW1
1 2 3 4
Sensor test mode
SW1
1 2 3 4
ON
OFF
ON
OFF
ON
OFF
Control panel key test mode
SW1
1 2 3 4
ON
OFF
MP303-UM-251-9370 6-3
6. ELECTRICAL ADJUSTMENTS

6.3 Checking the Voltage Level for the Main Board
MP303-UM-251-9370 6-4
6. ELECTRICAL ADJUSTMENTS
(1) Remove the bottom panel assembly and top left cover.
(2) Connect all cables to the main board as shown in Fig. 6-1 below except for connector J4 that connects to
the electrostatic adhesion circuit board.
Fig. 6-1
(3) Connect the AC adapter to the main board.
(4) Turn on the power switch and then check the voltage levels.
(5) You will find test pins (TP1 through TP4) on the main board. The output voltage levels of these pins are
given in the table below.
Test pin
No. Name
Output voltage Permissible range
TP1 +24V +24V +22.5V to +25.5V
TP2 +12V +12V +11.5V to 12.5V
TP3 GND 0V
TP4 VCC +5V +4.9V to +5.1V

6.4 Updating the System Firmware
MP303-UM-251-9370 6-5
6. ELECTRICAL ADJUSTMENTS
To update the system firmware you need to have the following files. In addition, you need to use a computer
and Centronics cable.
• MP303.X : MP303-04 firmware
• SEND.EXE : Utility to transfer files using Windows
• SENDB.EXE : Utility to transfer files using DOS
How to update the system firmware
(1) Connect the computer and the MP303-04 via the Centronics interface.
(2) Turn on the power while pressing the RIGHT ARROW POSITION key and the LEFT ARROW POSITION
key, and then press the ENTER key to display the menu shown below.
UPDATE?
NO
(3) Select “YES” using the UP ARROW POSITION key or the DOWN ARROW POSITION key to display the
menu shown below.
CENTRO
GET-ACK
This enables you to select the timing of the Centronics interface.
Normally, there is no need to change this setting. If you cannot transfer data correctly via the Centronics
interface, use the UP ARROW POSITION key or the DOWN ARROW POSITION key to change this
timing.
(4) Press the ENTER key to display the menu shown below.
PLEASE
SEND
(5) Send firmware to the plotter from the computer.
Drag and drop the firmware file onto the SEND.EXE icon when using Windows. For DOS mode, use
SENDB.EXE as shown below.
>SENDB MP303.X
(6) The following menu is displayed while data is being received.
**KB
RECEIVED
(7) The plotter will start the initialization routine when all the data has been received. The firmware versions
are displayed during the initialization routine. Check the firmware version that you updated.
(8) Turn off the power.
(9) Perform the NOV-RAM clear operation whenever you replace the main board.

6.5 NOV-RAM Clear
When you replace the main board, you must clear the Non-Volatile RAM (NOV-RAM).
If you clear the Non-Volatile RAM, you will lose the setup parameters.
How to clear the Non-Volatile RAM
(1) Set SW1 to the NOV-RAM Clear mode as shown below.
SW1
1 2 3 4
ON
OFF
MP303-UM-251-9370 6-6
6. ELECTRICAL ADJUSTMENTS
(2) Turn on the power to the plotter.
(3) The NV RAM CLEAR menu appears. The plotter immediately starts to clear the parameters on the NOV-
RAM, and then sets the default values.
NV RAM
CLEAR
(4) When Non-Volatile RAM clearing is complete, the NV RAM OK! menu appears.
NV RAM
OK!
(5) Turn off the power to the plotter.
(6) Return the SW1 setting to normal mode as shown below.
SW1
1 2 3 4
ON
OFF
(7) Turn on the power to the plotter.
The SET MODE menu appears. (This menu appears when you clear the Non-Volatile RAM)
SET MODE
STD 1.00
(8) Select “STD” for the standard model using the LEFT ARROW POSITION key or RIGHT ARROW
POSITION key.
(9) Press the ENTER key to store the setting.
(10) Turn off the power to the plotter.

6.6 Adjusting the Pen Force
MP303-UM-251-9370 6-7
6. ELECTRICAL ADJUSTMENTS
Place the plotter on a horizontal surface such as a table.
(1) Mount a ceramic pen in position No.1 of the pen station and then load a sheet of paper.
(2) Press the PAUSE key to retrieve the ceramic pen, then lower the pen by following the displayed menu.
(3) Press the MODE key, and then press the UP ARROW POSITION key or DOWN ARROW POSITION key
until the menu shown below appears.
PEN TYPE
Ceramic
(4) Select “PEN TYPE Ceramic” by pressing the LEFT ARROW POSITION key or RIGHT ARROW
POSITION key. This selection enables you to measure the pen force using the low pen force mode.
(5) Raise the pen using a 50 g dial tension gauge, then measure the pen force at the point when the pen tip
separates from the paper.
Press the UP ARROW POSITION key or DOWN ARROW POSITION key until the menu shown below
appears.
Pen
Up Down
Press the LEFT ARROW POSITION key or RIGHT ARROW POSITION key to raise or lower the pen.
(6) Adjust the pen force using VR1 so that it is within the range of 20 to 33 g in the low pen force mode.
There is a hole for maintenance use on the lower left of the cover. You can turn VR1 from this hole.
(7) Raise and lower the pen two or three times to get the correct pen force.
(8) Press the MODE key, and then press the UP ARROW POSITION key or DOWN ARROW POSITION key
until the menu shown below appears.
PEN TYPE
W.Fiber
(9) Select “PEN TYPE W.Fiber” by pressing the LEFT ARROW POSITION key or RIGHT ARROW
POSITION key. This selection enables you to measure the pen force using the high pen force mode.
(10) Raise the pen using a 50 g dial tension gauge, then measure the pen force at the point when the pen tip
separates from the paper.
Press the UP ARROW POSITION key or DOWN ARROW POSITION key until the menu shown below
appears.
Pen
Up Down
Press the LEFT ARROW POSITION key or RIGHT ARROW POSITION key to raise or lower the pen.
(11) Adjust the pen force using VR1 so that it is within the range of 35 g to 50 g in the high pen force mode.
(12) Raise and lower the pen two or three times to get the correct pen force.
Pen Force
Target Pen Force Pen Type
Low Pen Force 25 g (20 to 33 g) Ceramic
High Pen Force 40 g (35 to 50 g) W.Fiber

6.7 Using the Test Modes
6.7.1 Self Test
MP303-UM-251-9370 6-8
6. ELECTRICAL ADJUSTMENTS
Your plotter comes with a self-test mode, which enables the plotter to check its own functions, without
necessarily being connected to the computer.
A correctly drawn test pattern signifies that all of the functions of the plotter (excluding the interface functions)
have been tested and found normal. Be sure to run this self-test before connecting the plotter to the
computer.
Procedure
(1) Check that the POWER switch is off and that pens are mounted in the pen station.
(2) Turn on the POWER switch while holding down the LEFT ARROW POSITION key.
The plotter is initialized.
The prompts below are consecutively displayed.
SelfTest
Mode
Set
Paper!
(3) After initialization has been completed, place a sheet of paper on the writing panel.
Press the CHART HOLD key to secure the sheet. The prompt below is displayed.
Press
Ent key
(4) Press the ENTER key to draw the self-test pattern.
The plotter repeatedly plots the same pattern until you cancel the self-test mode.
To temporarily stop plotting, press the PAUSE key.
To cancel the self-test mode, press the CANCEL key to stop plotting and then turn off the plotter.

6.7.2 Character Dump Mode
MP303-UM-251-9370 6-9
6. ELECTRICAL ADJUSTMENTS
This mode allows experienced users to detect the cause of communication problems between the plotter
and the computer. In Character Dump mode, the plotter produces an exact printout of the codes it receives,
printing character data as ASCII codes and the non-character (control) data as two-digit hexadecimal values
(e.g., 0A: Line Feed, 0D: Carriage Return).
Procedure
(1) Mount a pen in the pen station’s Pen 1 position.
(2) Place a sheet of paper on the writing panel.
(3) Hold down the DOWN ARROW POSITION key while you turn on the plotter.
The plotter is initialized.
CharDump
Mode
(4) Secure the paper.
The prompt below is displayed to prompt you to press the CHART HOLD key.
Set
Paper!
(5) Once the paper is secured, the PROMPT lamp on the plotter blinks.
The prompt below is displayed.
Press
ENT Key
(6) Press the ENTER key to enter the Character Dump Mode.
The plotter prints “** DUMP MODE (V*.** GL) **” on the paper and then awaits data from the computer.
The message below briefly reappears on the display.
CharDump
Mode
(7) When the computer runs an application program and outputs the data to the plotter, it starts printing the
received data in ASCII format.
(8) To exit the Character Dump Mode, turn off the plotter and then turn it back on using only the POWER
switch.

6.7.3 Debug Mode
MP303-UM-251-9370 6-10
6. ELECTRICAL ADJUSTMENTS
This mode is used to locate programming errors in your application program.
When the plotter is in Debug Mode, its buffer size is reduced to permit easier detection of the section of the
program that is causing the plotting error.
Procedure
(1) Mount a pen in the pen station’s Pen 1 position.
(2) Place a sheet of paper on the writing panel.
(3) Hold down the ENTER key while you turn on the plotter.
The plotter is initialized.
Debug
Mode
(4) Secure the paper.
The prompt below is displayed for a few seconds to prompt you to press the CHART HOLD key.
Set
Paper!
The prompt below is displayed
Ready
(5) The plotter is now in the Debug Mode.
(6) Run the target program at the computer for output to the plotter.
The message DEBUG MODE is displayed for a few seconds.
In this mode, the plotter’s buffer memory is reduced to the following sizes:
• In RS-232C mode : 256 bytes
• In Centronics mode : 10 bytes
(7) To exit the Debug Mode, turn off the plotter and then turn it back on using only the POWER switch.
HINT: When using the RS-232C interface, the timing of data transmission varies with the selected
handshake mode as follows.
• During hardwire handshaking:
The ER (DTR) signal line goes off when the available space in the buffer drops to 64 bytes.
It goes on when the available space in the buffer rises to 128 bytes of data.
• During Xon/Xoff handshaking:
Xoff status is entered when the available space in the buffer drops to 32 bytes.
Xon status is entered when the available space in the buffer rises to 128 bytes of data.
NOTE: After the plotter is turned off, Debug mode is not resumed when only the ENTER key is
pressed.
The Debug mode cannot be used with the USB interface.

6.7.4 Pen Retrieval Test Mode
MP303-UM-251-9370 6-11
6. ELECTRICAL ADJUSTMENTS
Use this mode to perform a pen retrieval test and to adjust the pen positions.
Procedure (Fast Mode)
(1) Mount disposable ink pens in Positions 1 to 8 of the pen station.
(2) Hold down the LEFT ARROW POSITION key and DOWN ARROW POSITION key while you turn on the
plotter.
(3) Press the ENTER key to start the pen retrieval test.
Execution of the pen retrieval test can be temporarily suspended by pressing the PAUSE or ENTER key.
To resume test execution, press the PAUSE or ENTER key.
(4) To exit the pen retrieval test mode, turn off the plotter.
Procedure (Slow Mode and Pen Position Adjustment)
(1) Mount disposable ink pens in Positions 1 to 8 of the pen station.
(2) Hold down the CANCEL key while you turn on the plotter.
(3) Place a sheet of paper on the writing panel.
(4) Press the ENTER key to display the prompt shown below.
Select
ADJ SLOW
(5) If you want to start the slow pen retrieval test, press the RIGHT ARROW POSITION key. The plotter will
begin plotting the pen numbers on the paper.
Execution of the pen retrieval test can be temporarily suspended by pressing the PAUSE or ENTER key.
To resume test execution, press the PAUSE or ENTER key.
(6) If you want to adjust the pen positions, press the LEFT ARROW POSITION key at the above menu. The
plotter then displays the menu shown below. You can adjust the position of pen number 1 by using the
ARROW POSITION keys.
No.1
PressENT
Press the ENTER key after you have adjusted the position of pen number 1. The plotter then displays the
menu shown below.
No.8
PressENT
Press the ENTER key after you have adjusted the position of pen number 8.
(7) To exit the pen retrieval test mode, turn off the plotter.

6.7.5 Running Test Mode
MP303-UM-251-9370 6-12
6. ELECTRICAL ADJUSTMENTS
Procedure
(1) Move the pen carriage manually to the upper left position so that it crosses the X home sensor and Y
home sensor.
(2) Hold down the CANCEL key and MODE key while you turn on the plotter.
(3) The plotter starts the running test.
(4) To exit the Running Test Mode, turn off the plotter.

6.7.6 Sensor Test Mode
Procedure (Using the DIP switch)
(1) Set SW1 to the Sensor Test Mode as shown below and then turn on the plotter.
SW1
1 2 3 4
ON
OFF
(2) The status of each sensor is displayed on the LCD panel.
XH YH
Display Sensor name Operation when the High/Low level changes
XH X home sensor When the dog blocks the sensor XL
YH Y home sensor Same as the above YL
MP303-UM-251-9370 6-13
6. ELECTRICAL ADJUSTMENTS
(3) If a sensor is not operating properly, check its wiring, its connector contact, and the position of the sensor
dog. If everything checks out all right, either the sensor or main board may be defective.
In this case, initialize the NOV-RAM and then run the sensor test again.
(4) To exit the sensor test mode, turn off the plotter and then return the SW1 setting to normal mode as
shown below.
SW1
1 2 3 4
ON
OFF
Procedure (Using control panel keys)
(1) Move the pen carriage manually to the upper left position so that it crosses the X home sensor and the Y
home sensor.
(2) Hold down the UP ARROW POSITION key and DOWN ARROW POSITION key while you turn on the
plotter.
(3) The menu below appears.
KEY&LED
TEST
(4) Press the DOWN ARROW POSITION key to display the menu shown below.
SENSOR
TEST
(5) Press the ENTER key to put the plotter into the Sensor Test Mode.

(6) The status of each sensor is displayed on the LCD panel.
XH YH
Display Sensor name Operation when the High/Low level changes
XH X home sensor When the dog blocks the sensor XL
YH Y home sensor Same as the above YL
MP303-UM-251-9370 6-14
6. ELECTRICAL ADJUSTMENTS
(7) If a sensor is not operating properly, check its wiring, its connector contact, and the position of the sensor
dog. If everything checks out all right, either the sensor or main board may be defective.
In this case, initialize the NOV-RAM and then run the sensor test again.
(8) To exit the Sensor Test Mode, turn off the plotter.

6.7.7 Control Panel Key Test Mode
MP303-UM-251-9370 6-15
6. ELECTRICAL ADJUSTMENTS
Procedure (Using the DIP switch)
(1) Set SW1 to the Control Panel Key Test Mode as shown below and then turn on the plotter.
SW1
1 2 3 4
ON
OFF
(2) The menu below appears, so press the control panel key corresponding to each bit and check that its
value properly changes to 1 from 0.
CMERDLU
00000000
Press each key on the control panel; the status will change as shown below.
Key Status of LCD
C M E R D L U
CANCEL 0 1 0 0 0 0 0 0
MODE 0 0 1 0 0 0 0 0
ENTER 0 0 0 1 0 0 0 0
RIGHT ARROW 0 0 0 0 1 0 0 0
DOWN ARROW 0 0 0 0 0 1 0 0
LEFT ARROW 0 0 0 0 0 0 1 0
UP ARROW
Normal status : 0
0 0 0 0 0 0 0 1
While the key is pressed : 1
(3) If a key is not operating properly, check its wiring and its connector contact. If everything checks out all
right, either the control panel or main board may be defective.
In this case, initialize the NOV-RAM and then run the control panel key test again.
(4) To exit the Control Panel Key Test Mode, turn off the plotter and then return the SW1 setting to normal
mode as shown below.
SW1
1 2 3 4
ON
OFF
Procedure (Using control panel keys)
(1) Move the pen carriage manually to the upper left position so that it crosses the X home sensor and the Y
home sensor.
(2) Hold down the UP ARROW POSITION key and the DOWN ARROW POSITION key while you turn on
the plotter.
(3) The menu below appears.
KEY&LED
TEST

MP303-UM-251-9370 6-16
6. ELECTRICAL ADJUSTMENTS
(4) Press the ENTER key to put the plotter into the Control Panel Key Test Mode.
(5) The menu below appears, so press the control panel key corresponding to each bit and check that its
value properly changes to 1 from 0.
CMERDLU
00000000
Press each key on the control panel; the status will change as shown below.
Key Status of LCD
C M E R D L U
CANCEL 0 1 0 0 0 0 0 0
MODE 0 0 1 0 0 0 0 0
ENTER 0 0 0 1 0 0 0 0
RIGHT ARROW 0 0 0 0 1 0 0 0
DOWN ARROW 0 0 0 0 0 1 0 0
LEFT ARROW 0 0 0 0 0 0 1 0
UP ARROW
Normal status : 0
0 0 0 0 0 0 0 1
While the key is pressed : 1
(6) If a key is not operating properly, check its wiring and its connector contact. If everything checks out all
right, either the control panel or main board may be defective.
In this case, initialize the NOV-RAM and then run the control panel key test again.
(7) To exit the Control Panel Key Test Mode, turn off the plotter.

7. TROUBLESHOOTING
MP303-UM-251-9370 7-1
7. TROUBLESHOOTING
7.1 The Plotter is Turned On But Doesn’t Operate
Symptom Cause Solution
POSITION XY ALARM Right after the plotter is The X or Y motor is Replace the X or Y motor.
error appears.
turned on.
defective.
The main board is defective. Replace the main board.
During pen retrieval. See “The plotter cannot See “The plotter cannot
perform pen retrieval perform pen retrieval
correctly.” shown below. correctly.” shown below.
During a plotting operation. There is something blocking Remove the blocking object.
the X slider or Y slider.
The motor control is
abnormal.
Replace the main board.
During initialization. Incorrect X or Y home Adjust the X or Y home
sensor position.
sensor position. (See
Sections 5.10, 5.11.)
The X or Y home sensor is Replace the X or Y home
defective.
sensor.
The plotter is not The POWER LED lamp The AC adapter is defective. Replace the AC adapter.
initialized.
does not light.
The main board is defective. Replace the main board.
The POWER LED lamp The firmware is defective. Download new firmware.
lights.
7.2 During Plotting Operations
The main board is defective. Replace the main board.
Symptom Cause Solution
The plotted lines are Non-specified paper was The paper does not suit the Use the specified paper.
faint or blurred. used.
pens being used.
Specified paper was used. The pen speed is too fast or Reduce the pen speed or
the pen force is too low. increase the pen force.
Defective pen(s). Replace the pen(s).
The pen solenoid is
defective.
Replace the pen solenoid.
The pen doesn’t lower. The pen solenoid is
defective.
Replace the pen solenoid.
The Y flexible cable is Replace the Y flexible
defective.
cable.
The main board is defective. Replace the main board.
The plotted line quality is Appears in the X-axis. The X belt tension is Adjust the X belt tension.
poor.
Plotted lines are crooked. incorrect.
(See Section 5.1.)
The X roller pressure is Adjust the X roller pressure.
incorrect.
(See Section 5.6.)
Appears in the Y-axis. The Y belt tension is Adjust the Y belt tension.
Plotted lines are crooked. incorrect.
(See Section 5.2.)
The Y roller pressure is
incorrect.
Adjust the Y roller pressure.
The plotter cannot The plotter doesn’t draw The perpendicularity is Adjust the perpendicularity
perform pen retrieval lines at right angles. incorrect.
precision.
correctly.
The retrieval position shifts The X home position has Adjust the X home position.
to the X direction. shifted.
(See Section 5.10.)
The retrieval position shifts The Y home position has Adjust the Y home position.
to the Y direction. shifted.
(See Section 5.11.)
The perpendicularity and The pen station position is Adjust the pen station
X/Y home positions are
correct.
incorrect.
position. (See Section 5.12.)

8. ERROR MESSAGES
MP303-UM-251-9370 8-1
8. THE ERROR MESSAGES
8.1 Hardware Error
Displayed message Cause
POSITION
This message appears when, for some reason, the current pen position
XY ALARM
is invalid. In this case, turn the plotter off and then back on again.
8.2 GP-GL Command Errors
In GP-GL command mode, the plotter displays the error messages below if an error occurs for which
masking of the corresponding Error bit in the STATUS byte has been disabled using the ˝ command.
Displayed message Cause
A command error occurs if a hexadecimal code from 60H to 7EH is
E1.
processed as a command character. This message may also appear if
COMM ERR the RS-232C interface conditions are improperly set or if the program
being run at the computer was not written using GP-GL commands.
When a command specifying coordinate values is being processed, a
E4.
parameter overflow error occurs if a numeric parameter exceeds the
PARA OV
“Parameter Range”.
An input/output error occurs during the transfer of data via the interface.
E5.
With the RS-232C interface, this message indicates that the parity or
I/O ERR data length may be improperly set. Check your interface conditions once
more.
Cancelling an error status
You can cancel an error status using any of the methods below, thereby setting the status of the
corresponding Error bit to zero.
(1) Execute a READ STATUS WORD 1 or READ STATUS WORD 3 command.
(2) Press the ENTER key. (Effective only in case of a data format error.)
Note: If a data format error has occurred, performing either Method (1) or (2) above while
execution of the next command is temporarily suspended enables that command to be
executed.
(3) Initialize the plotter.
(4) Execute the INTERFACE CLEAR command.
Note: Method (3) or (4) clears all the data in the plotter’s buffer memory.

8.3 HP-GL Command Errors
MP303-UM-251-9370 8-2
8. THE ERROR MESSAGES
The plotter displays the messages below when an error occurs for which masking of the corresponding Error
bit in the STATUS byte has been disabled using the IM command.
Displayed message Cause
A command that cannot be recognized was executed. Check that your
program contains valid HP-GL commands.
E1.
COMM ERR
E2. PARA
NO. ERR
E3. PARA
EXCEEDED
E5. PARA
UNKNOWN
A command containing an incorrect number of parameters was executed.
Check that the commands specified in your program are followed by the
correct number of parameters.
A command containing a parameter value that exceeds its permissible
range was executed. Check the permissible parameter range.
A character that your plotter cannot plot was specified.

9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
MP303-UM-251-9370 9-1
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.1 Main Unit
No. Part No. Part Name Description Q’ty Remarks
1 035130123 Electrostatic Panel 1 Same as MP5300
2 618260100 Writing Panel Base 1
3 035130110 Insulating Sheet 1 Same as MP5300
4 773513500 High Voltage Board 1 Same as MP5300
Main Unit
4
3
1
2

MP303-UM-251-9370 9-2
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.2 External Casing
No. Part No. Part Name Description Q’ty Remarks
1 618264150 Cover, Right 1
2 035135023 Cover, Lower Left 1
3 618264120 Cover, Front 1
4 618264140 Cover, Rear 1
5 618260200 Bottom Plate 303 1
6 031000070 Rubber Foot 4 Same as MP5300
External Casing
1
6
6
4
3
5
2
6
6

MP303-UM-251-9370 9-3
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.3 Control Panel Section
No. Part No. Part Name Description Q’ty Remarks
1 618264100 Cover, Upper Left 1
2 618260300 Control Panel PR312003 1
3 771826570 LCD Assembly DMC50448N-E-AE, CA312001 1
4 031000160 Caution Label No.2 1 Same as MP5300
Control Panel Section
4
3
1
2

MP303-UM-251-9370 9-4
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.4 Bottom Panel
No. Part No. Part Name Description Q’ty Remarks
1 618260200 Bottom Plate 303 1
2 771826500 Main Board 303 1
3 618264210 Terminal Label 303 1
4 618264200 Model Name Label 303 1
Bottom Panel
4
5
2
1
3

MP303-UM-251-9370 9-5
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.5 X-Axis Slider, X-Axis Drive, Pen Station
No. Part No. Part Name Description Q’ty Remarks
1 035132013 X Slider 1 Same as MP5300
2 035132022 X Roller Bracket 1 Same as MP5300
3 035132030 X Roller Adjustment Bracket 1 Same as MP5300
4 303100012 X Roller 5 Same as MP5300
5 035132040 X Rail 1 Same as MP5300
6 035132220 Antistatic Brush 1 Same as MP5300
7 035132230 Retaining Rubber 1 Same as MP5300
8 035132080 Blank Cover 1 Same as MP5300
9 302200015 Support BSB320 1 Same as MP5300
10 035032260 Tension Pulley 4 Same as MP5300
11 509000014 X Motor TS3747N31E3 1 Same as MP5300
12 035132200 X Drive Shaft M Shaft 53 1 Same as MP5300
13 380000057 Coupling 1 Same as MP5300
14 035032341 Drive Pulley 20P2M4BF 2 Same as MP5300
15 311605068 Drive Shaft Bearing F625ZZ 1 Same as MP5300
16 353513001 Bush 5 x 4.5 1 Same as MP5300
17 353513002 Bush 4 x 5 1 Same as MP5300
18 359800008 Bush 4 X 5 1 Same as MP5300
19 035132210 X Belt 1820 2 Same as MP5300
20 035132160 Tension Bracket, Front 1 Same as MP5300
21 035132170 Tension Bracket, Rear 1 Same as MP5300
22 035132190 X Limit Bracket 1 Same as MP5300
23 035130102 Side Cover 1 Same as MP5300
24 035135041 Cover, Rear A 1 Same as MP5300
25 618260100 Writing Panel Base 1
26 773513080 Relay Board PR05406 1 Same as MP5300
508000015 X Home Sensor GP1A53HR 1 Same as MP5300
105401150 Y Home Sensor Assembly CS, 05410 1 Same as MP5300
508102285 Y Home Sensor SW, SPPB-TYPE1 1 Same as MP5300
27 691801520 X Flat Cable FPC, 05410 1 Same as MP5300
28 031000110 Pen Station 1 Same as MP5300
29 020000232 Magnet 8 Same as MP5300
30 053200240 Pen Cap Spring 8 Same as MP5300
31 053200330 Pen Cap Rubber 8 Same as MP5300
32 053200321 Cap Base 8 Same as MP5300
33 054026020 Support Plate 1 Same as MP5300
34 035136020 Pen Station Bracket 2 Same as MP5300
35 795320706 Pen Station w/Magnet 1 Same as MP5300
36 795320716 Pen Station Assembly 1 Same as MP5300
37 518110070 Control Panel Flexible Cable Filter ESD-FPL-34 1 Same as MP5300

X-Axis Slider, X-Axis Drive, Pen Station
2
35
4
7
28
4
36
10
3
21
9
4
5
MP303-UM-251-9370 9-6
24
17
10
19
1
26
34
6
29
30
33
8
31
32
34
27
20
22
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
18
10
25
14
23
16
13
11
15
14
12
37
19

MP303-UM-251-9370 9-7
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.6 Y-Axis Slider, Y-Axis Drive
No. Part No. Part Name Description Q’ty Remarks
1 035133012 Y Bar 1 Same as MP5300
2 035133020 Y Pulley Mounting Plate 1 Same as MP5300
3 035133031 Y Pulley 12 1 Same as MP5300
4 035133040 Y Pulley Shaft 1 Same as MP5300
5 035133050 Y Belt 1 Same as MP5300
6 035133102 Drive Pulley 10 1 Same as MP5300
7 035132230 Y Motor TS3747N32E3 1 Same as MP5300
8 773513100 Pen Holder Assembly 1 Same as MP5300
9 035134072 Pen Holder 1 Same as MP5300
10 020000232 Magnet 1 Same as MP5300
11 035034081 Solenoid Support Rubber 1 Same as MP5300
12 509000035 Solenoid J119-189 1 Same as MP5300
13 105401090 Pen Flexible Printed Cable FPC, 05401 1 Same as MP5300
14 035134013 Y Slider 1 Same as MP5300
15 035134081 Y Roller 10B 3 Same as MP5300
16 031004330 Y Roller Spindle 1 Same as MP5300
17 035134020 Pen Force Adjustment Screw 1 Same as MP5300
18 035134090 Pen Holder Spacer 1 Same as MP5300
19 035134041 Pen Up Spring 1 Same as MP5300
20 035134100 Plunger Spring 1 Same as MP5300
21 052113610 Y Flexible Printed Cable Holder 1 Same as MP5300
22 353513005 Bush 3 x 9.5 1 Same as MP5300
23 303100003 Pivot Bearing 2 Same as MP5300
24 031004540 Pivot Bearing Screw 2 Same as MP5300
25 618264150 Solenoid Cover 303 1
26 035132061 Y Motor Cover 1 Same as MP5300
27 035132050 Y Bar Cover 1 Same as MP5300
28 035132070 Y Slider End 1 Same as MP5300
29 035132120 Y Roller Spindle 1 Same as MP5300
30 035032260 Tension Pulley 1 Same as MP5300

Y-Axis Slider, Y-Axis Drive
26
1
6
13
5
12
21
2
17
15
MP303-UM-251-9370 9-8
3
24
4
16
7
15
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
25
14
24
28 29
15
19
30
20
27
11
23
9
18
23
10
22
8

MP303-UM-251-9370 9-9
9. DISASSEMBLY DIAGRAMS AND PARTS LISTS
9.7 Standard Accessories
No. Part No. Part Name Description Q’ty Remarks
1 500051951 AC Adapter SA45-3129 1 For all countries
2 500052004 AC Power Cable 100V JAPAN 361-70100020-01 1 Depends on the country
500052350 AC Power Cable UL UC-671-N03 1 Depends on the country
500052402 AC Power Cable CEE EN-514-N04 1 Depends on the country
500052397 AC Power Cable BS BS89/3-C7-1.8m 1 Depends on the country
3 053139013 Tilt Stand 2
4 035139020 Plastic Cover 1
5 031009020 Paper Alignment Labels 1
6 031000070 Rubber Foot for Tilt Stand 4
7 500052043 USB Cable CBL0106-1.5M 1
8 618269350 CD, User’s Manual MP303-CUG01 1
9 618269380 Quick Manual MP303-UM-851 1
10 982000070 Ceramic Pen HC503P-BK 1
9.8 Others
No. Part No. Part Name Description Q’ty Remarks
1 618269100 Packing Box for MP303 1

MP303-UM-251-9370 10-1
10. CIRCUIT DIAGRAMS
10. CIRCUIT DIAGRAMS
10.1 Main Board
Main board (Top)
CONNECT
CONNECT
LOCALZ
YENA
YENB
D[0..15]
LOCALLED
IOCS1Z
SFREE
LCDB[0..6]
FR_BUSYZ
PENH
PENL
CHARTLED
CHARTHOLDZ
XHOMEZ
YHOMEZ
YMP
YMM PENUP
PENCONT1
PENCONT2
PB[0..7]
DCDRIVER
DCDRIVER
XCOMA
SFRZ
YCOMA
XCOMB
YCOMB
PENH
PENL
YMP
YMM
PENUP
PENCONT1
PENCONT2
GRC1507
GRC1507
XCOMB
D[0..15]
CENCSZ
SRVINTZ
CINTINZ
CS2Z
YCOMA
SFREE
RESET
RDZ
CINTOUTZ
XCOMA
LOCALZ
LOCALLED
WRLZ
YCOMB
CS1Z
LOCALINTZ
SFRZ
YENA
YENB
USBCSZ
A[0..21]
AP[18..21]
AB-ENZ
NVRAMCSZ
IOCS1Z
CHARTHOLDZ
CHARTLED
CHARTINTZ
KROMCSZ
IF
IF
RXD0
CTS0Z
DSR0Z
TXD0
RTS-DZ
DTR-DZ
D[0..15]
A[0..21]
CENINT
RDZ
WRLZ
CENCSZ
RESET
YHOMEZ
XHOMEZ
PB[0..7]
MEMORY
MEMORY
D[0..15]
A[0..21]
FR_BUSYZ
RASZ
CASLZ
CASHZ
RDZ
RDWR
EPROMOUT
RESETZ
NVRAMCSZ
CS0Z
WRLZ
KROMCSZ
USB
USB
USBINTZ
RDZ
RESETZ
WRLZ
USBCSZ
D[0..15]
A[0..21]
CPU
CPU
RDZ
WRLZ
CS1Z
RDWR
CS0Z
RESET
CASHZ
RASZ
CASLZ
A[0..21]
RXD0
TXD0
CTS0Z
DSR0
LCDB[0..6]
LOCALINTZ
USBINTZ
SRVOINTZ
D[0..15]
CINTOUTZ
CS2Z
DTR-DZ
RTS-DZ
EPROMDOUT
AB-ENZ
AP[18..21]
RESETZ
CHARTINTZ
A[0..21]
AP[18..21]
NVRAMCSZ
CENCSZ
RESETZ
RESET
LCDB[0..6]
RESET
RESETZ
CENCSZ
USBCSZ
NVRAMCSZ
IOCS1Z
SRVINTZ
CINTZ
LOCALINTZ
USBINTZ
RESETZ
IOCS1Z
USBCSZ
D[0..15]
RESET
LOCALINTZ
SRVINTZ
USBINTZ
CINTZ
CHARTINTZ
PENH
PENL
PENH
PENL
CHARTINTZ
YMP
YMM
YMP
YMM
PB[0..7]
KROMCSZ
KROMCSZ

Main board (Connections)
VCC
VCC
VCC
R1 470 2012
74LS06
R2 470 2012
74LS06
R3 470 2012
74LS06
U1A
1 2
U1B
3 4
U1C
5 6
LOCALLED
RA2
10K*4
RA1
10K*4
RA7
10K*4
CHARTLED
GND
GND
KCONT0Z
KEY1
KEY0
KEY3
KEY2
KCONT1Z
PAUSEZ
CHARTHOLDZ
VCC
PAUSELED
CHARTLED
POWERLED
J1
PROMPTLED
4
3 4 1 2 3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
1
PB[0..7]
KCONT0
D18 1SS352-TPH3
KCONT0
KCONT1
FL1
EXCCET102U
FL2
EXCCET102U
PROMPTLED
KCONT1
FL9 N2012Z121T03
D19 1SS352-TPH3
LOCALZ
FL7 N2012Z121T03
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
CHARTHOLDZ
SFREE
PENUP
PENCONT1
PENCONT2
FL3
EXCCET102U
RA4
10K*4
RA3
10K*4
VCC
FL4
5597-14CPB
R4 470 2012
R44 8.2K
EXCCET102U
FL5
3 4 1 2 3
MP303-UM-251-9370 10-2
EXCCET102U
4
2
1
U2
J11
FL6
LCD_CONT
VCC
GND
RS
R/W
E
D4
D5
D6
D7
EXCCET102U
VCC
18
17
16
15
14
13
12
11
B0
B1
B2
B3
B4
B5
B6
B7
A0
A1
A2
A3
A4
A5
A6
A7
DIR
OE
2
3
4
5
6
7
8
9
1
19
D0
D1
D2
D3
D4
D5
D6
D7
D[0..15]
1
2
3
4
5
6
7
8
9
10
A6S-4101(OMRON)
FR_BUSYZ
SW1
FL12
IOCS1Z
B10B-PH-K
EXCCET102U
74HC245/SO
FL13
EXCCET102U
FL14
C2
104
EXCCET102U
1SS352-TPH3
FL15
RA6
10K*4
RA5
10K*4
VCC
EXCCET102U
D1
C1
47uF/16V
FL16
D4
EXCCET102U
FL17
D3
D2
EXCCET102U
FL18
EXCCET102U
FL19
SNT-S10
YMP
FL20
LCDB0
LCDB1
LCDB2
LCDB3
LCDB4
LCDB5
LCDB6
SNT-S10
LCDB[0..6]
FL21
SNT-S10
YMM
FL22
SNT-S10
D5
J2
FL23
R5 0
+24V
YMP
YMP
YMM
YMM
GND
YA0
YB0
VCC
PENH
PENL
GND
XHOMEZ
YHOMEZ
1
2
3
4
5
6
7
8
9
10
11
12
13
EXCCET102U
YENA
FL24
R6 0
TP2
+12V
TP1
+24V
EXCCET102U
SFPW-56
U3
NJM78M12DL1A
F1 ET 2A(fuse)
SW2
R7 0
YENB
+12V
1/1
2/1
J3
HEC0470-01-640
1
VCC
C5
102
1
I O
3
R9 0
C4
102
C3
10uF/16V
G
D6
SFPW-56
2/2 1/2
2
2
C6
104
TP3
GND
FL25 N2012Z121T03
PENH
SJ-W2P4A-30BB
FL26 N2012Z121T03
PENL
FL27
SLD13S-1
EXCCET102U
XHOMEZ
FL28
EXCCET102U
YHOMEZ
10. CIRCUIT DIAGRAMS
+24V
C8
FL29 104
+24V
TP4
VCC
U4 SI-8050
J4
2
+24V
1
CHGND
B2B-XH-A
4
FB
C7
220uF/50V
VCC
L1 SLF12575-151M1R5
1
N2012Z121T03
2
Vin
Vout
C9
U5A
C10
ON
GND
Q1
2SC4112
3
1
2
D7
SFPW-56
220uF/50V
CHARTLED
1000uF/10V
5
3
U1D
9 8
74LS06
74HC08

MP303-UM-251-9370 10-3
10. CIRCUIT DIAGRAMS
Main board (CPU)
1 1 1 1 1
2 2 2 2 2
3 3 3 3 3
4 4 4 4 4
A4
A15
A10
A11
A17
A9
A6
A8
LCDB2
LCDB1
LCDB5
LCDB0
LCDB4
LCDB3
LCDB6
A3
A0
A16
A7
A12
A2
A1
A5
A14
A13
D5
D7
D3
D2
D11
D15
D6
D4
D11
D6
D3
D13
D12
D1
D12
D15
D5
D8
D9
D0
D4
D10
D13
D8
D1
D14
D2
D10
D14
D7
D0
D9
A1
A0
A5
A4
A3
A2
A9
A8
A7
A6
A13
A12
A11
A10
A17
A16
A15
A14
AP21
AP20
AP19
AP18
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
U1F
74LS06
13 12
C19
104
RA11
22K*4
C11
18
RA18
10K*4
C14
104
RA8
22K*4
R11 0
R13
10K
U7
PST592DMT
1
2
3
4
VOUT
M.R
Vcc
GND
R12
C23 104
C15 471
FL41
N2012Z121T03
R14 200
RA12
22K*4
C20
104
R15 3K
C17
104
RA15
10K*4
RA19
10K*4
U5B
74HC08
4
5
6
U1E
74LS06
11 10
RA16
10K*4
U5C
74HC08
9
10
8
RA13
10K*4
RA9
22K*4
RA17
10K*4
C21
104
C13
104
C18
104
Y1 XPEEEC6.00MHz
C12
18
U6
SH7014
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
29
30
31
32
70
69
68
67
66
64
63
62
60
59
58
57
56
54
53
52
72
74
73
75
78
79
84
76
91
92
93
94
95
96
98
99
97
100
45
24
25
26
28
51
50
48
47
38
36
34
41
40
44
49
46
43
42
85
86
87
88
89
102
104
105
106
107
108
110
111
112
1
2
83
80
81
82
21
37
65
77
103
3
23
27
33
39
55
61
71
90
101
109
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
PB6/A18
PB7/A19
PB8/IRQ6/A20/WAIT
PB9/IRQ7/A21
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
XTAL
EXTAL
MD3
MD2
MD1
MD0
RES
NMI
PF0/AN0
PF1/AN1
PF2/AN2
PF3/AN3
PF4/AN4
PF5/AN5
PF6/AN6
PF7/AN7
AVSS
AVCC
PA6/TCLKA/CS2
PB2/IRQO/RAS
PB3/IRQ1/CASL
PB4/IRQ2/CASH
PB5/IRQ3/RDWR
PA0/RXD0
PA1/TXD0
PA3/RXD1
PA4/TXD1
WRL
WRH
RD
CS0
CS1
PA7/TCLKB/CS3
PA2/SCK0/DREQ0/IRQ0
PA5/SCK1/DREQ1/IRQ1
PA8/TCLKCC/IRQ2
PA9/TCLKCD/IRQ3
PE0/TIOC0A/DREQ0
PE1/TIOC0B/DRAK0
PE2/TIOC0C/DREQ1
PE3/TIOC0D/DRAK1
PE4/TIOC1A
PE5/TIOC1B
PE6/TIOC2A
PE7/TIOC2B
PE8
PE9
PE10
PE11
PE12
PE13
PE14/DACK0/AH
PE15/DACK1
PA15/CK
PLLVcc
PLLCAP
PLLVss
Vcc
Vcc
Vcc
Vcc
Vcc
Vss
Vss
Vss
Vss
Vss
Vss
Vss
Vss
Vss
Vss
Vss
C22
104
RA14
10K*4
C16
104
U5D
74HC08
12
13
11
RA10
22K*4
RDZ
WRLZ
CS1Z
RDWR
CS0Z
RESET
CASHZ
RASZ
CASLZ
A[0..21]
RXD0
TXD0
CTS0Z
DSR0
LOCALINTZ
USBINTZ
SRVOINTZ
D[0..15]
CINTOUTZ
CS2Z
DTR-DZ
RTS-DZ
EPROMDOUT
AB-ENZ
AP[18..21]
RESETZ
LCDB[0..6]
CHARTINTZ

MP303-UM-251-9370 10-4
10. CIRCUIT DIAGRAMS
Main board (DC Driver)
NC
XMM
XMP
2
1
3
3
2
1
SFRZ
SFRZ
+24V
+24V
+24V
+24V
+12V
VCC
+24V
VCC
C27
224_2125
C30
153
FL33
SNT-S10
R20
20K
D13
SFPW-56
C39
104
R18
24K
VR1
5K
C29 220uF/50V
C38
102
C37
104
+
- U9B
NJM2904M
5
6
7
R47
10K
C28
103/50V
C36
220uF/50V
R24
12K
R25
9.1K
JP6
DSP03-003-432
R17
39_1W
QA1
L6203
2
6
5
7
11
10
9
3
1
4
8
VS
GND
IN1
IN2
ENA
SNS
VREF
OUT1
OUT2
BOOT1
BOOT2
D10
SFPW-56
FL30
SNT-S10
D14
SFPW-56
C32
152
JP5
DSP03-003-432
D8
SFPW-56
C31
153
U8
TEA3717DP
7
8
9
11
15
6
14
3
4
5
12
13
10
2
16
1
INPUT1
PHASE
INPUT0
REF
OUTPUTA
VSS
VSA
VSB
GND
GND
GND
GND
COMP I
PTIME
SENSE
OUTPUTB
+
- U9A
NJM2904M
3
2
1
8
4
R22
1W 2.0
J5
B3B-XH-A
1
2
3
R21
1K
R19
16K
C41
821
C40
821
R16
39_1W
R23 150K
D9
SFPW-56
QA2
L6203
2
6
5
7
11
10
9
3
1
4
8
VS
GND
IN1
IN2
ENA
SNS
VREF
OUT1
OUT2
BOOT1
BOOT2
FL31
SNT-S10
D15
SFPW-56
C33
224_2125
R46 68K
C35 220uF/50V
D11
SFPW-56
FL32
SNT-S10
C25
153
D12
SFPW-56
C26
152
C24
153
C34
103/50V
XCOMA
SFRZ
YCOMA
XCOMB
YCOMB
PENCONT2
PENCONT1
PENUP
PENH
PENL
YMP
YMM

MP303-UM-251-9370 10-5
10. CIRCUIT DIAGRAMS
Main board (GRC1507 Servo)
1 2 3 4
4
3
1 2
VCC
XB
XA
GND
S=L:A
S=H:B
D0
D9
GA-VCC
D1
D10
D5
GA-GND
RDZ
D2
D6
D11
GA-GND
D3
D7
GA-GND
WRLZ
GA-VCC
D8
D4
WRLZ
A21
RDZ
AP18
AP19
AP20
AP21
A5
A3
A18
A21
A19
A1
A21
A20
A19
A20
A2
A19
A18
A20
A4
VCC
VCC
VCC
VCC
VCC
VCC
VCC
R28 0
R30 0
FL36
EXCCET102U
C51
8
FL34
EXCCET103U
J6
B4B-XH-A
1
2
3
4
C44
102
RA32
22K*4
C48
102
R32 2.4K
FL37
EXCCET102U
C45 104
R27 0
C47
102
RA21
470*4
FL42
N2012Z121T03
R26
10K
U14A TC7WU04F
1 7
R41 0
U12A
74HC32
1
2
3
C49
102
R31
2K
U11
GRC1507
3
28
58
53
78
22
4
15
59
29
40
2
54
65
60
79
90
34
6
45
83
61
7
82
1
8
84
99
5
51
100
55
80
62
73
63
81
64
52
66
35
67
57
68
74
75
36
76
72
77
37
38
39
41
85
42
43
86
44
56
30
69
70
91
93
87
9
88
94
89
25
95
10
96
92
97
11
98
26
12
31
13
27
14
32
16
33
17
23
18
24
19
20
21
47
46
49
50
VDD
VDD
TSNS2*
VDD
VDD
CS4*
VSS
VSS
TSNS1*
VSS
VSS
ADTRG*
VSS
VSS
SFREE
VSS
VSS
CS6*
TSTIN
WAIT*
CHALED2
OUTDIS*
TSTIN2
CHARTHOLD
HISINLED
TSTIN3
CHALED1
PENLED13
CARLED
SDADIN
PENLED24
YLED
LOCALLED
XCOMA
SRVINT*
XCOMB
HISPLED
YCOMA
SDACLK
YCOMB
SRAMCS*
PNCOMA
SDALD
PNCOMB
LOCALINT*
VIEWINT*
KROMCS*
HISPINT*
CINTIN
CINTOUT*
FDDCS*
CENCS*
PENCS*
NVRAMCS*
CHARTTIMER
IOCS1*
IOCS2*
LOCALKEY*
OFFCS*
PSADCS*
CPUCLK
XDAL*
YDAL*
CLKIN
XENA
VIEWKEY*
D
HISPKEY*
XENB
CHARTKEY*
A
YENA
D
YENB
SYSRST
PNENA
D
PNENB
A
D
HA
D
A
D
HA
D
HA
D
A
D
A
D
D
D
RD*
WR*
PENSD
SAMP
R42 0
C50
101
R40 0
Y2
XPCEEC50.0MHz
U12B
74HC32
4
5
6
U14B
TC7WU04F
3 5
C46
102
C52
8
R29 0
U10
74HC157/SO
1
15
4
7
9
12
2
5
11
14
3
6
10
13
SEL
EN
1Y
2Y
3Y
4Y
1A
2A
3A
4A
1B
2B
3B
4B
FL35
N2012Z121T03
R43 0
C42
104
U13
SN75189APW
1
4
10
13
2
5
9
12
3
6
8
11
7
14
1A
2A
3A
4A
C1
C2
C3
C4
1Y
2Y
3Y
4Y
GND
VCC
RA20
22K*4
C43
104
XCOMB
D[0..15]
CENCSZ
SRVINTZ
CINTINZ
CS2Z
YCOMA
SFREE
RESET
RDZ
CINTOUTZ
XCOMA
LOCALZ
LOCALLED
WRLZ
YCOMB
CS1Z
LOCALINTZ
SFRZ
USBCSZ
A[0..21]
NVRAMCSZ
IOCS1Z
YENB
YENA
AB-ENZ
AP[18..21]
CHARTLED
CHARTINTZ
CHARTHOLDZ
KROMCSZ

Main board (I/F)
VCC
RA23
1K*4
RA22
1K*4
VCC
VCC
C53 104
DATA3
DATA2
DATA1
DATA0
DATA7
DATA6
DATA5
DATA4
RA25
10K*4
1 2 3 4 1 2 3 4
RA24
10K*4
D[0..15]
DATA[7..0]
DATA 7
DATA 6
DATA 5
DATA 4
DATA 3
DATA 2
DATA 1
DATA 0
DATA 0
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
D0
D1
D2
D3
D4
D5
D6
D7
A2
A3
MP303-UM-251-9370 10-6
3
U17B
1
STB
U16
A1
A2
A3
A4
A5
A6
A7
A8
G
DIR
74LS245
24
17
39
2
J7
D7
D6
D5
D4
D3
D2
D1
D0
+5V
SLC
ACK
STB
BUSY
ERROR
OPEN
OPEN
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
N.C.
GND
FCN685J036-L/Y
2
3
4
5
6
7
8
9
19
1
3
4
2 1
U17A
74LS14/SO
2
74LS14/SO
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
43
42
41
40
38
37
36
35
14
15
16
18
19
20
21
23
9
10
11
13
8
7
6
5
GND
VCC
VCC
VCC
9
8
7
6
5
4
3
2
18
13
10
1
11
32
14
15
12
16
17
19
20
21
22
23
24
25
26
27
28
29
30
31
33
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
RD
WR
CS
RESET
32
31
30
29
28
27
26
25
4
3
44
34
1
33
A[0..21]
JP1
RDZ
WRLZ
CENCSZ
RESET
PB[0..7]
XHOMEZ
YHOMEZ
JP2
2
U17D 74LS14/SO
9 8
U17C
5 6
CENINT
1
3
U17E
11 10
74LS14/SO
U17F
74LS14/SO
BUSY
VCC
U15
MSM82C55A-2GS-2K
13 12
74LS14/SO
5
6
7
8
VCC
RA26
10K*4
RA27
10K*4
5
6
7
8
5
6
7
8
VCC
RA29
1K*4
RA28
1K*4
VCC
C54
224_2125
U18
11
V+
10
C55
224_2125
C57 224_2125
15
12
13
VCC
R33
R34 1K
R35 1K
1K
14
10. CIRCUIT DIAGRAMS
R45 0
2
1
24
20
7
3
23
16
5
18
19
21
6
4
22
17
3
JP3
1
R36
2
8
GND Vcc
9
C1+
V-
C1-
C2+
C56
104
C58
224_2125
J8
RTS
DTR
TXD
RXD
CTS
DSR
+5V
SHILED
GND
ESDB-25S-R2N
C2-
4
20
2
3
5
6
9
1
7
T1 OUT
T2 OUT
T3 OUT
T4 OUT
T1 IN
T2 IN
T3 IN
T4 IN
TXD0
RTS-DZ
DTR-DZ
R1 IN
R2 IN
R3 IN
R4 IN
R1 OUT
R2 OUT
R3 OUT
R4 OUT
RXD0
CTS0Z
DSR0Z
1K
SP208ECA SSOP
DSP03-003-432

MP303-UM-251-9370 10-7
10. CIRCUIT DIAGRAMS
Main board (Memory)
5
6
7
8
NORMAL
DEBUG
2
3
1
(KANJI ROM)
RESETZ
DEBUGZ
RESETZ
DEBUGZ
A2
A20
A15
A1
A9
A16
A19
A5
A16
A6
A2
A10
A12
A15
A16
A9
A19
A3
A7
A8
A15
A11
A1
A2
A9
A9
A4
A7
A17
A13
A8
A1
A18
A10
A4
A3
A12
A5
A13
A18
A10
A3
A12
A6
A8
A11
A1
A18
A4
A17
A6
A13
A8
A14
A14
A10
A6
A4
A7
A5
A11
A2
A7
A17
A5
A[0..21]
A3
A14
D12
D13
D14
D15
D7
D2
D12
D6
D6
D7
D5
D11
D14
D4
D4
D5
D1
D15
D9
D13
D6
D3
D1
D0
D2 D2
D11
D15
D10
D12
D7
D1
D10
D14
D3
D3
D6
D8
D0
D0
D0
D7
D5
D1
D12
D0
D13
D8
D5
D5
D2
D7
D15
D10
D4
D2
D14
D3
D9
D4
D1
D10
D4
D11
D9
D3
D8
D8
D11
D9
D13
D6
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
U21
74HC273/SO
1
11
2
5
6
9
12
15
16
19
3
4
7
8
13
14
17
18
CLR
CLK
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
D1
D2
D3
D4
D5
D6
D7
D8
JP4
DSP03-003-432
U20
M5M418160CJ-6S
2
6
3
31
4
22
5
1
7
37
8
21
9
13
10
17
33
29
34
42
35
30
36
18
38
14 39
19
40
41
20
23
24
25
26
27
28
16
15
DQ0
VCC
DQ1
LCAS
DQ2
VSS
DQ3
VCC
DQ4
VSS
DQ5
VCC
DQ6
WE
DQ7
A0
DQ8
OE
DQ9
VSS
DQ10
UCAS
DQ11
A1
DQ12
RAS DQ13
A2
DQ14
DQ15
A3
A4
A5
A6
A7
A8
A9
NC
NC
U19 MBM29F800BA-70PFTN
37
26
27
29
46
11
28
25
31
47
24
12
33
23
35
22
38
21
40
20
42
19
44
18
30
8
32
7
34
6
36
5
39
4
41
3
43
2
45
48
1
17
16
15
VCC
CE
VSS
DQ0
VSS
WE
OE
A0
DQ1
BYTE
A1
RESET
DQ2
A2
DQ3
A3
DQ4
A4
DQ5
A5
DQ6
A6
DQ7
A7
DQ8
A8
DQ9
A9
DQ10
A10
DQ11
A11
DQ12
A12
DQ13
A13
DQ14
A14
DQ15/A-1
A16
A15
A17
A18
RY/BY
RA30
10K*4
C60
10uF/16V
C62 104
U12C
74HC32
9
10
8
J9
8911-050-178S-A
49
1
50
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
42
41
43
44
45
46
47
48
U22
BR93LC56F-W
5
3
4
6
1
8
2
7
DI
CS
SK
DO
NC
NC
VCC
GND
C67 104
C61 104
U12D
74HC32
12
13
11
U25
MBM29F160
37
26
27
29
46
11
28
25
31
47
24
12
33
23
35
22
38
21
40
20
42
19
44
18
30
8
32
7
34
6
36
5
39
4
41
3
43
2
45
48
1
17
16
15
9
14
VCC
CE
VSS
DQ0
VSS
WE
OE
A0
DQ1
BYTE
A1
RESET
DQ2
A2
DQ3
A3
DQ4
A4
DQ5
A5
DQ6
A6
DQ7
A7
DQ8
A8
DQ9
A9
DQ10
A10
DQ11
A11
DQ12
A12
DQ13
A13
DQ14
A14
DQ15/A-1
A16
A15
A17
A18
RY/BY
A19
WP
C59 104
U14C TC7WU04F
6 2
D[0..15]
A[0..21]
FR_BUSYZ
RASZ
CASLZ
CASHZ
RDZ
RDWR
EPROMOUT
RDZ
RESETZ
NVRAMCSZ
CS0Z
WRLZ
KROMCSZ

Main board (USB)
U23
J10
Vcc
D-
D+
GND
USB CONNECTOR(TYPE B)
R37 1.5K
1
2
3
4
Y3 OCETGCA-6.0MHz
3
OUT N.C
1
4
VDD GND
2
VCC_L C63 104
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
FL40
EXCCET103U
A1
A2
A3
A4
A5
A6
A7
MP303-UM-251-9370 10-8
FL39
EXCCET103U
12
34
25
44
43
42
41
38
37
36
35
22
21
20
19
16
15
14
13
32
31
30
29
28
27
26
24
33
18
D[0..15]
23
PUCTL
R38 22
1
D+
2
D-
FL38
EXCCET103U
R39 22
6
XIN
7
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
A0
A1
A2
A3
A4
A5
A6
A[0..21]
XOUT
INTR
ADSEL
DREQ0
DACK0
DREQ1
DACK1
VCC_L
3
40
VCC0
VCC1
C64
104
5
39
GND0
GND1
RD
WR
RES
CS
TEST1
TEST2
9
10
11
8
4
17
RDZ
WRLZ
RESETZ
USBCSZ
8 7 6
RA31
100K*4
ML60852A
USBINTZ
VCC
VCC_L
D16
RB491D
U24 UPC29M33
1
I O
3
G
D17
RB491D
C66
10. CIRCUIT DIAGRAMS
2
C65
104
47uF/16V

10.2 Control Panel
D2
LED GREEN
D1
LED GREEN
D3
LED RED
SW8
CHART
POWERLED
CHARTLED
PAUSELED
VCC
CHARTHOLDZ
SW9
PAUSE
SW5
CANCEL
1 2
MP303-UM-251-9370 10-9
1 2
J1
SW7
ENTER
1 2
1 2
PAUSEZ
KCONT1Z
KEY2
KEY3
KEY0
KEY1
KCONT0Z
GND
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SW6
MODE
1 2
5597-14CPB
SW4
+X
1 2
SW3
-Y
1 2
SW2
-X
1 2
SW1
+Y
1 2
10. CIRCUIT DIAGRAMS

10.3 Relay Board
JP3
YMP
YMM
GND
GND
YB0
+5V
YA0
7
6
5
4
2
1
3
+5V
MP303-UM-251-9370 10-10
J1
J2
1 PEN(H)
2 GND
3 PEN(L)
IL-FPC-3S-S1T1
YMP 1
YMP 2
YMM 3
YMM 4
GND 5
YA 6
YB 7
+5V 8
+5V
PEN(H) 9
PEN(L) 10
GND 11
XHOME 12
YHOME 13
ZC-113
X-SENSOR
+5V GP1A53HR 4
+5V
R1
1
5
ANODE
CATHODE
GND
VOUT
+5V
1
2
3
4
5
470
C1
104
3
2
Y-SENSOR
2
1 1
VOUT
GND
1
2
SPP8.TYPE1
10. CIRCUIT DIAGRAMS
2
CABLE ASSY

10.4 High Voltage Power Board
L1
31001C
R5
510K
MP303-UM-251-9370 10-11
6
3
+8
1
2
+22V
CHD
02NR-D8S
2
J1
510K
R6
D1
7 C4
470P
(6KV)
R1
100K
C1
+
A
1 -1.5KV
B
2
C
3
D
4
E
5
F GND
6
CR6-65-3.96DS
22u/35V
C5
470P (6KV)
TFR2T
D2
TFR2T
Q1
2SC2719L
5
4
D5
1S1585
R3
R2
1K
C3
1
1K
D3
1S1585
C2
10u/16V
2200P
D4
RD4.7E
R4
10K
+
GND
10. CIRCUIT DIAGRAMS