SERVICE MANUAL

Feature Difference ................................................................... 3
Service Note ............................................................................ 5
1. GENERAL
Getting Started .............................................................. 1-1
Basic Operations ........................................................... 1-7
Additional Operations .................................................... 1-11
Additional Information ................................................... 1-14
2. DISASSEMBLY
2-1. Upper Case Removal .................................................... 2-1
2-2. Rear Panel Removal ..................................................... 2-1
2-3. Front Panel Section Removal ........................................ 2-1
2-4. FR-127, DM-62 Board Removal ................................... 2-1
2-5. RP-230, SE-68 Board Removal .................................... 2-2
2-6. Mechanism Deck Removal............................................ 2-2
2-7. MA-315, SR-825 Board Removal ................................. 2-2
2-8. Internal Views ................................................................ 2-3
2-9. Circuit Boards Location ................................................. 2-4
3. BLOCK DIAGRAMS
3-1. Overall Block Diagram ................................................... 3-1
3-2. Video Block Diagram ..................................................... 3-4
3-3. Servo/System Control Block Diagram .......................... 3-7
3-4. I/O, C+ Block Diagram ................................................... 3-9
3-5. Audio Block Diagram ..................................................... 3-11
3-6. Tuner Block Diagram ..................................................... 3-13
3-7. Mode Control Block Diagram ........................................ 3-15
3-8. Power Block Diagram .................................................... 3-18
4. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
4-1. Frame Schematic Diagram ............................................ 4-1
4-2. Printed Wiring Boards and Schematic Diagrams ......... 4-5
RP-230 Printed Wiring Board ........................................ 4-5
RP-230 Schematic Diagram ......................................... 4-7
MA-315 Printed Wiring Board ....................................... 4-10
MA-315 (Video, Audio) Schematic Diagram ................. 4-13
MA-315 (Servo/System Control) Schematic Diagram .. 4-17
MA-315 (Hi-Fi Audio) Schematic Diagram.................... 4-21
MA-315 (OSD) Schematic Diagram .............................. 4-23
MA-315 (IN/OUT) Schematic Diagram ......................... 4-25
MA-315 (Tuner) Schematic Diagram ............................ 4-28
SE-68 Printed Wiring Board and Schematic Diagram .. 4-31
DM-72, FR-127 Schematic Diagram ............................. 4-34
DM-72, FR-127 Printed Wiring Board ........................... 4-37
SR-825 Printed Wiring Board ........................................ 4-39
SR-825 Schematic Diagram ......................................... 4-41
5. INTERFACE, IC PIN FUNCTION DESCRIPTION
TABLE OF CONTENTS
Section Title Page Section Title Page
– 4 –
5-1. System Control-Video/RP Block Interface
(MA-315 board IC161) .................................................. 5-1
5-2. System Control-Servo Peripheral Circuit Interface
(MA-315 board IC161) .................................................. 5-1
5-3. System Control-Mechanism Interface
(MA-315 board IC161) .................................................. 5-2
5-4. System Control-System control Peripheral circuit
Interface (MA-315 board IC161) ................................... 5-3
5-5. System Control-Audio Block Interface
(MA-315 board IC161) .................................................. 5-3
5-6. Servo/System/Tuner/Timer Control Microprocessor
Pin Function (MA-315 board IC161) ............................. 5-4
6. ERROR CODE .......................................................... 6-1
7. ADJUSTMENTS
7-1. Mechanical Adjustments ............................................... 7-1
7-2. Electrical Adjustments ................................................... 7-1
2-1. Pre-Adjustment Preparations ........................................ 7-1
2-1-1. Instruments to be Used ............................................ 7-1
2-1-2. Connection ............................................................... 7-1
2-1-3. Set-up of Adjustment ............................................... 7-1
2-1-4. Alignment Tape ......................................................... 7-1
2-1-5. Specified I/O Level and Impedance ......................... 7-2
2-1-6. Adjusting Sequence ................................................. 7-2
2-2. Power Supply Adjustment ............................................. 7-2
2-2-1. Power Supply Check ................................................ 7-2
2-3. Servo System Adjustment ............................................. 7-3
2-3-1. Switching Position Adjustment ................................. 7-3
2-4. Video System Adjustment ............................................. 7-3
2-4-1. Playback Y signal Level Check ................................ 7-3
2-4-2. Recording Chroma Level Check .............................. 7-4
2-4-3. Sync. AGC Check ..................................................... 7-4
2-4-4. X’tal Oscillation Frequency Check ........................... 7-4
2-5. Audio System Adjustment ............................................. 7-5
2-5-1. Hi-Fi Audio System Adjustment ............................... 7-5
1. AF Switching Position Adjustment ........................... 7-5
2. Frequency Responce Check .................................... 7-5
3. Overall Level Characteristic and
Distortion Factor Check ........................................... 7-6
4. Overall S/N Check .................................................... 7-6
2-5-2. Normal Audio System Adjustment ........................... 7-6
1. ACE Head Adjustment ............................................. 7-6
2. E-E Output Level Check ........................................... 7-6
3. Frequency Responce Adjustment ............................ 7-6
4. Overall Level Characteristic and Distortion
Factor Check ............................................................ 7-7
5. Overall S/N Check .................................................... 7-7
2-6. Parts Arrangement Diagram for Adjustments ............... 7-8
8. REPAIR PARTS LIST
8-1. Exploded Views ............................................................. 8-1
8-1-1. Front Panel and Cabinet Assemblies ....................... 8-1
8-1-2. Chassis Assembly .................................................... 8-3
8-1-3. Mechanism Chassis Assembly (1) ........................... 8-4
8-1-4. Mechanism Chassis Assembly (2) ........................... 8-5
8-1-5. Mechanism Chassis Assembly (3) ........................... 8-6
8-2. Electrical Parts List ....................................................... 8-7