Service Manual - Fostex

Service Manual
6301B
Personal Monitor Self-Powered

CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
ATTENTION:
POUR ÉVITER LES CHOCS ÉLECTRIQUES,
INTRODUIRE LA LAME LA PLUS LARGE DE
LA FICHE DANS LA BORNE CORRE-
SPONDANTE DE LA PRISE ET POUSSER
JUSQU' AU FOND.
“WARNING”
The lightening flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the user to the presence of uninsulated
“dangerous voltage” within the product's enclosure
that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS-
TURE.”
The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and maintenance
(servicing) instructions in the literature
accompanying the appliance.
SAFETY INSTRUCTIONS
1.
2.
3.
4.
5.
6.
7.
8.
Read instructions - All the safety and operating instructions
should be read before the appliance is operated.
Retain instructions - The safety and operating instructions
should be retained for future reference.
Heed warnings - All warnings on the appliance and in the
operating instructions should be adhered to.
Follow instructions - All operating and use instructions
should be followed.
Water and Moisture - The appliance should not be used
near water - for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near a
swimming pool, and the like.
Carts and Stands - The appliance should be used only
with a cart or stand that is recommended by the manufacturer.
An appliance and cart combination should be moved with
care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to overturn.
Wall or Ceiling Mounting - The appliance should be
mounted to a wall or ceiling only as recommended by the
manufacturer.
Ventilation - The appliance should be situated so that its
location or position does not interfere with its proper ventilation.
For example, the appliance should not be situated
on a bed, sofa, rug, or similar surface that may block
the ventilation openings; or, placed in a built-in installation,
such as a bookcase or cabinet that may impede the
flow of air through the ventilation openings.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Heat - The appliance should be situated away from heat
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to a
power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - The precautions that should
be taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should be
routed so that they are not likely to be walked on or
pinched by items placed upon or against them, paying
particular attention to cords at plugs, convenience receptacles,
and the point where they exit from the appliance.
Cleaning - The appliance should be cleaned only as recommended
by the manufacturer.
Nonuse Periods - The power cord of the appliance should
be unplugged from the outlet when left unused for a long
period of time.
Object and Liquid Entry - Care should be taken so that
objects do not fall and liquids are not spilled into the enclosure
through openings.
Damage requiring Service - The appliance should be serviced
by qualified service personnel when:
A. The power supply cord or the plug has been damaged;
or
B. Objects have fallen, or liquid has been spilled into the
appliance; or
C. The appliance has been exposed to rain; or
D. The appliance does not appear to operate normally or
exhibits a marked changed in performance; or
E. The appliance has been dropped, or the enclosure
damaged.
Servicing - The user should not attempt to service the appliance
beyond that described in the operating instructions.
All other servicing should be referred to qualified
service personnel.

6301B/BX/BE
TABLE OF CONTENTS
1. SPECIFICATIONS ........................................................................................ 3
2. OVERALL EXPLODED VIEW .................................................................. 4
3. PCB ASSY AND PARTS LIST................................................................. 6
4. PATTERN DRAWING .................................................................................. 8
5. CIRCUIT DIAGRAMS .................................................................................. 9
NOTES
• Adjustment procedures, parts list, pattern drawing and circuit diagrams are given in this manual to assist
the service technician in maintaining the 6301B.
• For your information, this service manual complies to the 6301B with the followings are the serial
number of 6301B.
USA/CND
EUR
UK
JPN
: 0260001 and onwards
: 0660001 and onwards
: 0760001 and onwards
: 1060001 and onwards
1. SPECIFICATIONS
SPEAKER ( Internal )
Type
Impedance
Efficiency
10cm Full Range Single Cone
4 Ω
84 dB/W (1m)
AMPLIFIER
Normal Input Level
-10dBV
Output more than 10Wrms ( 8 Ω load )
Frequency Response
20 ~ 50 kHz +0dB-3dB
Distortion 0.05 % or less ( at 1W output )
Residual Noise
-70dBV (0.3mV)
Input Sensitivity Unbalanced type : -6dBV (0.5Vrms)
Balanced type : +4dBm (1.2Vrms)
Input Impedance Unbalanced type : Higher than 20kΩ
Balanced type : Higher than 10kΩ
GENERAL
Dimensions
Weight
Power supply
JPN
USA/CND
EUR/UK
Power consumption
120 (W) × 188 (H) × 118 (D) mm
3.0 kg
100 VAC, 50/60 Hz
120 VAC, 60 Hz
230 VAC, 50/60 Hz
33 W
3

4
3
BTT
4x12 Bzn
1
2
BTT
4x12 Bzn
7
9
13
12
15
14
BTT
4x12 Bzn
BTT
4x12 Bzn
PTP WH
3x10 Bzn
19
16
17
P 4x10 Bzn
BTT
4x12 Bzn
18
20
PTT
3x8 Ni
2. OVERALL EXPLODED VIEW
6301B/BX/BE
PTT
4x8 Bzn
10
11
8
21
PTT
3x6 Czn
22
7
15
PTT
3x6 Czn
4
5
PTT
4x8 Bzn
6
15
23
15
24

6301B/BX/BE
Ref. No. Part No. Description
1 8278001000 Speaker, 10F05AV
2 8216034000 Packing, Speaker
3 8220462100 Cover, Speaker, B3/X/E
4 8226050000 Button, Push, Power, B3/X/E
5 8226067000 Knob, Pot, B3/X/E
6 8210020100 Box, Speaker, B3/X/E (192631)
7 8216213002 Sound Absorbent, B3/X/E
8 8242041200 Trans, Power, 120V, B3/X/E
8242042001 Trans, Power, 220V/240V, B3/X/E
8242040200 Trans, Power, 100V, B3/X/E
9 8274209000 PCB Assy, Trans, B3X
10 8274216000 PCB Assy, PowerAmp, B3/X/E
11 8220464000 Bracket, PCB, B3/X/E
12 8239002000 Insulator, IC, B3/X/E
13 8274210000 PCB Assy, JK2, B3/X/E
14 8274211000 PCB Assy, LineAmp, B3
8274212000 PCB Assy, LineAmp, B3X
8274213000 PCB Assy, LineAmp, B3E
15 8216198100 Gasket, Rear, B3/X/E
16 8220463201 Panel, Rear, B3 (192630)
8220463202 Panel, Rear, B3X/E (192629)
17 8216196000 Cover, XLR, B3X/E
18 8245392000 Conn, XLR, B3X/E
19 8207000209 Bushing, B3/X/E
20 8276217000 Cord, Power, B3/X/E, CSA
8276215000 Cord, Power, B3/X/E, CND
8276216000 Cord, Power, B3/X/E, EUR
8276879000 Cord, Power, B3/X/E, UK
8276003000 Cord, Power, B3/X/E, JPN
21 8253014008 SW, Power, B3/X/E
22 8256075005 Spark-Killer, 0.0047µF
23 8274214000 PCB Assy, LED, B3/X/E
24 8274215000 PCB Assy, VR, B3/X/E
5

6301B/BX/BE
3. PCB ASSY AND PARTS LIST
PCB Assy PowerAmp 8274216000
Ref. No. Part No. Description B BX BE
C001 8232050471 CAP, CER, 50V, 470pF, 5% * * *
C002 8232098105 CAP, ALU, 50V, 1µF, 20% * * *
C003, 004 8232097227 CAP, ALU, 35V, 220µF, 20% * * *
C005 8232095476 CAP, ALU, 16V, 47µF, 20% * * *
C006 8232026123 CAP, PES, 50V, 0.012µF, 5% * * *
C007 8232026104 CAP, PES, 50V, 0.1µF, 5% * * *
C008, 009 8232074000 CAP, CER, 50V, 0.1µF, 20% * * *
C010 8232026103 CAP, PES, 50V, 0.01µF, 5% * * *
C011, 012 8232133478 CAP, ALU, 35V, 4700µF, 20% * * *
D001 8234001607 D, STACK, 2W02G * * *
R001 8230004102 RES, CARBON, 1/4W, 1K, 5% * * *
R002 8230004563 RES, CARBON, 1/4W, 56K, 5% * * *
R004 8230004122 RES, CARBON, 1/4W, 1.2K, 5% * * *
R005 8230004563 RES, CARBON, 1/4W, 56K, 5% * * *
R006 8230004153 RES, CARBON, 1/4W, 15K, 5% * * *
R007 8230004102 RES, CARBON, 1/4W, 1K, 5% * * *
R008 8230004100 RES, CARBON, 1/4W, 10, 5% * * *
R010 8230004222 RES, CARBON, 1/4W, 2.2K, 5% * * *
U001 8234045600 IC, PowerAmp, TDA2050 * * *
PCB Assy LineAmp 8274211000
Ref. No. Part No. Description B BX BE
C021, 022 8232095106 CAP, ALU, 16V, 10µF, 20% *
C021, 022 Jumper *
C023 8232095106 CAP, ALU, 16V, 10µF, 20% * *
C024, 025 8232096476 CAP, ALU, 25V, 47µF, 20% * *
R021 8230004103 RES, CARBON, 1/4W, 10K, 5% *
R022 8230004103 RES, CARBON, 1/4W, 10K, 5% *
R022 8230004102 RES, CARBON, 1/4W, 1K, 5% *
R023 8230004392 RES, CARBON, 1/4W, 3.9K, 5% * *
R024 8230004103 RES, CARBON, 1/4W, 10K, 5% *
R024 Jumper *
R025 8230004392 RES, CARBON, 1/4W, 3.9K, 5% * *
R026 8230004103 RES, CARBON, 1/4W, 10K, 5% *
R027 8230004392 RES, CARBON, 1/4W, 3.9K, 5% * *
R028, 029 8230004102 RES, CARBON, 1/4W, 1K, 5% * *
U002 82360212000 IC, Analog, NJM4560DX * *
DZ001, 002 8234503959 D, ZENER, MTZ J 15C * *
CN002 8245053003 Conn, JACK, 8263, 3P, WHT * *
JK001 8245103000 Conn, Phone, B/BX/BE *
JP006, 007 Jumper *
6

6301B/BX/BE
PCB Assy JK2 8274210000
Ref. No. Part No. Description B BX BE
JK002 8245103000 Conn, Phone, B/BX/BE * * *
PCB Assy VR 8274215000
Ref. No. Part No. Description B BX BE
VR001 8240212002 POT, 50KA, B/BX/BE * * *
PCB Assy LED 8274214000
Ref. No. Part No. Description B BX BE
D002 8234006400 OPT, LED, RED, GL-3PR8 * * *
PCB Assy TRANS 8274209000
Ref. No. Part No. Description B BX BE
R031, 032 8230004512 RES, CARBON, 1/4W, 5.1K, 5% *
R034 8230004102 RES, CARBON, 1/4W, 1K, 5% *
T002 8242099000 TRANS, LINE, BX *
CN002 8245053003 Conn, JACK, 8263, 3P, WHT *
7

6301B/BX/BE
4. PATTERN DRAWING
C25
6301-102 LINE AMP 6301-104 VR
6301-105 LED
W31
R31
R34
R32
6301-106
TRANS
O I G
VR1W41
6301-103 G I/P S G
N
R29
R27
D2
P
W51
R23
W21
G
JP7
S
V+
V-
JK1
C23
R28
ZD1
ZD2
JK2
JP6
U2
C24
CN2/W26
R21
C21
R24
R22
R25
R26
C22
R5
U1
T2
W62 G
ORG
BRN
BLK
CN1
YEL
RED
6301-101
POWER AMP
C8
W12
C3
R2
C2
C1
R1
C12
C11
W10
TO SPK
R10
G I/P S G
W14
D1
G
G
W13
I
U3
R8
R7
C10
S
C7
C6
C5
C4
C9
V+
O
V-
R6
R4
N
W15
P
ORG ORG BLK
W11
8

6301B/BX/BE
9
6301B
5. CIRCUIT DIAGRAMS
6301-104
2
1
3
4
W41
1
2
3
VR1
50KA
6301-101
R1
1K
2
1
3
4
W14
R2
56K
C8
0.1
C2
1/50
C3
220/35
+VCC1
1
2
5
3
4
U1
TDA2050
2
1
3
W13
6301-103
1
4
2
JK2
2
1
3
W31
EXT SP
SP
SP1
C10
0.01
R8
10
2
1
W10
PGND1
C1
470P
R5
56K
C9
0.1
C4
220/35
-VCC1
6301-102
2
1
3
4
W21
1
4
2
JK1
2
1
3
4
W12
R6
15K
C5
47/16
R4
1.2K
C6
0.012 R7
1K
C7
0.1
SGND1
6301-105
D2
POWER LED
2
1
W51
R10
2.2K
2
1
W15
+VCC1
PGND1
AC POWER IN
P1
T1
S1
Z1
ORG
BLK
ORG
4
2
1
3
D1
W11
C11
4700/35
C12
4700/35
+VCC1
PGND1
SGND1
-VCC1

10
6301B/BX/BE
6301BX
1
ORG
2
1
3
W62
6301-106
T2
1
BRN
R31
5.1K
R34
1K
RED
WHT
GND
BALANCE
INPUT
3
2 1
J3
6301-102
1
RED
R32
5.1K
1
2
3
CN1
2
1
3
WIPT
6301-104
1
YEL
1
BLK
2
1
3
4
W41
1
2
3
VR1
50KA
6301-101
C3
220/35
+VCC1
EXT SP
6301-103
SP1
1
4
2
JK2
2
1
3
W13
2
1
3
W31
C10
0.01
C8
0.1
C9
0.1
R8
10
1
2
5
3
4
U1
TDA2050
R1
1K
C1
470P
R2
56K
C2
1/50
R27
3.9K
C23
10/16
2
1
3
4
W14
SGND
6
5
7
U2B
4560
R23
3.9K
R25
3.9K
JP6
R22
1K
+VCC
-VCC
2
3
8
4
1
U2A
4560
R24
10K
C21
NON
2
1
3
CN2/W26
R21
NON
SGND
JP7
UNBALANCE
INPUT
1
4
2
JK1
ZD1
15B2
C22
NON
+VCC
SGND
SGND
SGND
R28
1K
R26
NON
R4
1.2K
R5
56K
R6
15K
C6
0.012 R7
1K
C7
0.1
C4
220/35
-VCC1
2
1
W10
PGND1
SP
6301-105
+VCC1
SGND1
C5
47/16
2
1
3
4
W12
2
1
3
4
W21
R29
1K
C24
47/25
C25
47/25
ZD2
15B2
SGND
-VCC
S1
Z1
P1
ORG
T1
W11
4
2
1
3
D1
R10
2.2K
+VCC1
D2
POWER LED
2
1
W15
PGND1
2
1
W51
C11
4700/35
C12
4700/35
-VCC1
SGND1
PGND1
BLK
ORG
AC POWER IN

6301B/BX/BE
11
6301BE
6301-104
6301-102
R23
3.9K
2
1
3
4
W41
1
2
3
VR1
50KA
6301-101
C8
0.1
C3
220/35
+VCC1
EXT SP
SP
6301-103
SP1
1
4
2
JK2
2
1
W10
2
1
3
W31
2
1
3
W13
C10
0.01
C9
0.1
C4
220/35
R8
10
-VCC1
1
2
5
3
4
U1
TDA2050
R1
1K
C1
470P
R2
56K
C2
1/50
R27
3.9K
C23
10/16
2
1
3
4
W14
SGND
6
5
7
U2B
4560
R25
3.9K
JP6
R26
10K
R22
10K
+VCC
-VCC
2
3
8
4
1
U2A
4560
JP7
1
2
3
CN2/W26
R21
10K
C21
10/16
C22
10/16
R24
NON
SGND
SGND
SGND
RED
WHT
GND
BALANCE
INPUT
3
2 1
J3
2
1
3
WIPT
UNBALANCE
INPUT 1
4
2
JK1
C24
47/25
ZD1
15B2
+VCC
SGND
R28
1K
2
1
3
4
W12
2
1
3
4
W21
C5
47/16
R4
1.2K
R5
56K
R6
15K
C6
0.012 R7
1K
C7
0.1
PGND1
6301-105
D2
POWER LED
2
1
W15
2
1
W51
R10
2.2K
+VCC1
SGND1
R29
1K
C25
47/25
ZD2
15B2
SGND
-VCC
AC POWER IN
S1
Z1
P1
ORG
BLK
T1
W11
4
2
1
3
D1
C11
4700/35
+VCC1
PGND1
C12
4700/35
-VCC1
SGND1
PGND1
ORG

FOSTEX CORPORATION 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021
FOSTEX CORPORATION OF AMERICA 15431 Blackburn Ave., Norwalk, CA 90650, U.S.A. © PRINTED IN JAPAN FEB 1999 8288779000