Fostex PH-100 User manual

Service Manual
Model
PH-100
HEADPHONE AMP DISTRIBUTOR

SAFETY INSTRUCTIONS
Read instructions - All the safety and operating instruc-
tions 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 manufac-
turer.
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 over-
turn.
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 ven-
tilation. For example, the appliance should not be situ-
ated on a bed, sofa, rug, or similar surface that may block
the ventilation openings; or, placed in a built-in installa-
tion, such as a bookcase or cabinet that may impede the
flow of air through the ventilation openings.
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 recep-
tacles, and the point where they exit from the appliance.
Cleaning - The appliance should be cleaned only as rec-
ommended 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 en-
closure through openings.
Damage requiring Service - The appliance should be ser-
viced by qualified service personnel when:
A.
B.
C.
D.
E.
Servicing - The user should not attempt to service the ap-
pliance beyond that described in the operating instruc-
tions. All other servicing should be referred to qualified
service personnel.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.
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.
CAUTION:
ATTENTION:
The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and mainte-
nance (servicing) instructions in the litera-
ture accompanying the appliance.
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 magni-
tude to constitute a risk of electric shock to
persons.
“WARNING”
“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS-
TURE.”
1.
2.
3.
4.
5.
6.
7.
8.
The power supply cord or the plug has been damaged;
or
Objects have fallen, or liquid has been spilled into the
appliance; or
The appliance has been exposed to rain; or
The appliance does not appear to operate normally or
exhibits a marked changed in performance; or
The appliance has been dropped, or the enclosure
damaged.
9.
10.
11.
12.
13.
14.
15.
16.
17.

3
PH-100 Service Manual
Parts marked with this sign are safety critical components. They must always be replaced with identical
components. Refer to the Fostex Parts List and ensure exact replacement.
CAUTION
TABLE OF CONTENTS
NOTES
*Exploded view, PCB assembly, parts list and circuit diagrams are given in this manual to assist the service
technician in maintaining the Model PH-100.
*The following accessories are supplied with PH-100 as the standard accessories.
PH-100 owner's manual, MULTI : 8288495000
*Following is the packing material for the Model PH-100.
Carton, inner, PH-100 : 8528031000
Packing, side, A, PH-100 : 8528029000
Packing, side, B, PH-100 : 8528030000
1.
2.
3.
4.
4
5
6
14
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTROLS, INDICATORS & CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EXPLODED VIEW, PCB ASSEMBLY & PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . .
CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4
PH-100 Service Manual
1. SPECIFICATIONS
SPECIFICATION UNIT 0 dBV = 1 V r.m.s., 0 dBu = 0.775 V r.m.s.
INPUT
INPUT L/R
Connector XLR balanced, ø6 mm balanced / unbalanced phone jack
Input Level + 4 dBu (XLR), - 10 dBV
Input Impedance 20 kΩor more
INPUT,AUX RTN L MONO / R, CH IN
Connector RCA jack
Input Level - 10 dBV
Input Impedance 20 kΩor more
OUTPUT
PHONES
Connector ø6 mm stereo phone jack
Maximum Output Level 500 mW (32 Ω)
Load Impedance 8 Ω~ 32 Ω
CASCADE OUT L/R
Connector RCA jack
Output Level -10 dBV
Load Impedance 10 kΩor more
OUTPUT 49 (H) x 484 (W) x 267 (D) mm
WEIGHT About 4 kg
POWER
JPN AC 100 V 50 / 60 Hz
USA /CND (UL) AC 120 V 60 Hz
EUR (IEC CLASS I) AC 230 V 50 / 60 Hz
UK (BS) AC 230 V 50 Hz
POWER CONSUMPTION 18 W
STANDARD ENVIRONMENT
StandardTemperature 20 ±3 ˚C
Standard Humidity 60 ±5 %
ENVIRONMENT CONDITION
Characteristics Guaranteed
Temperature + 5 ~ + 35 ˚C
Humidity 30 % ~ 65 %
AC Voltage Deviation ±5 % or less
Operation Guaranteed
Temperature - 5 ~ + 45 ˚C
Humidity 10 % ~ 90 %
AC Voltage Deviation ±5 % or less
PHONES MAXIMUM OUTPUT 500 mW (at 32 Ωload, 3 % distortion, -10 dBV / 1 kHz input)
DISTORTION
PHONES - 65 dBV or less (DINAUDIO), - 80 dBV or less (IHFA)
CASCADE OUT - 85 dBV or less (DINAUDIO), - 90 dBV or less (IHFA)
RESIDUAL NOISE
PHONES 0.1 % or less (200 mW, 32 Ω, 1 kHz)
CASCADE OUT 0.05 % or less (-10 dBV, 1 kHz)
FREQUENCY RESPONSE
PHONES 30 Hz ~ 20 kHz: ±2 dB (200 mW, 32 Ω)
CASCADE OUT 30 Hz ~ 20 kHz: ±1 dB
CLICK NOISE - 20 dBVp-p or less (CASCADE OUT)
Specifications and physical appearance are subject to change without notice for product improvement.

5
PH-100 Service Manual
2. CONTROLS, INDICATORS & CONNECTORS
1. [PHONES] level controls (1 through 10)
2. [PEAK] indicator
3. [AUX IN] level control
4. [POWER] switch / indicator
5. [INPUT] level control
6. [INPUT (ST, MONO)] select switch
7. [PHONES] jacks (1 through 10)
10
0
HEADPHONE AMP DISTRIBUTOR
POWER
10
0
PH-100
5
5
AUX IN
INPUT
MONO
ST
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
10
0
5
PEAK
10
9
8
7
6
5
4
3
2
1
PHONES
CAL
12 34
567
< PH-100 Front Panel >
+4dBu
54321
10 9876
PHONES (PRIORITY TO "FRONT PHONES" OUTPUT)
AC IN
CASCADE
OUT (-10dBV)
L
10 9876
R
L/MONO
INPUT
(-10dBV)
CHANNEL IN (-10dBV) INPUT L INPUT R
-10dBV -10dBV
HOT
R
L/MONO
AUX IN
(-10dBV)
COLD
GND
XLR PHONE
2
3 1
T
R
S
21
43
5
R
+4dBu
2
134567
8
< PH-100 Rear Panel >
1. [AC IN] connector
2. [PHONES] jacks (1 through 10)
3. [CASCADE OUT] jacks (L, R)
(RCA: -10 dBV)
4. [CHANNEL IN] jacks (1 through 10)
(RCA: -10 dBV)
5. [AUX IN] jacks (L/MONO, R)
(RCA: -10 dBV)
6. [INPUT (-10dBV)] jacks
(RCA: -10 dBV)
7. [INPUT (+4dBu)] connectors (L, R)
(XLR: +4 dBV)
8. [INPUT (-10dBV)] jacks (L, R)
(PHONE: -10 dBV)

6
PH-100 Service Manual
PH-100 OVERALL EXPLODED VIEW & PARTS LIST
3. EXPLODED VIEW, PCB ASSEMBLY & PARTS LIST
Ref. No. Part No. Description
18507 0020 00 Foot, PH-100
28274 4090 00 PCB assy, Phones Out, PH-100
38274 4100 00 PCB assy, Power LED, PH-100
48274 4110 00 PCB assy, Power, PH-100
5 8274 4120 00 PCB assy, Power SW, PH-100
68218 2630 00 Sticker, GND
78276 8010 00 Cord, power, UL/CSA,
VM0033-0089
8276 8021 00 Cord, power, CEE, 0309B-0310B
8276 9170 00 Cord, power, BS 3C KP610-KS31A
8276 8000 00 Cord, power, DM, VM1292-1298
88526 0190 00 Knob, push, power, PH-100
98526 0130 00 Knob, volume, VF16EX
10 8520 0330 00 Angle, rack mount, DE-10
11 8520 0370 00 Bracket, AC-IN, NF-01A
12 8520 0440 00 Bracket, volume, PY008A0
13 8520 0450 00 Panel, front, print, PH-100
14 8520 0460 00 Panel, rear, print, PH-100
15 8520 0470 00 Chassis, PH-100
16 8516 0370 00 Sheet, insulation, PH-100
17 N/A
18 N/A
19 8274 4130 00 PCB assy, HP VOL
20 8274 4080 00 PCB assy, Main, PH-100
21 8542 0040 00 Transformer, power, 100V/120V,
PH-100
8542 0050 00 Transformer, power, 230V, PH-100,
22 8507 0030 00 Spacer, PWB, MSPLS-10U, PH-100
23 8520 0480 00 Case, top, print, PH-100
24 8516 0380 00 Sheet, insulation, B, PH-100

7
PH-100 Service Manual
C
C
E
E
D
A
D
B
A
B
19
13
9
20
12
10
9
10
15
1
16
21
11
4
7
14
2
23
B3 x 8BZn
BBT3 x 12BZn
B3 x 8BZn
BBT3 x 6BZn
BBT3 x 6BZn
BBT3 x 8BZn
BBT3 x 8BZn
BBT3 x 6BZn
BBT3 x 6CZn
BBT3 x 6BZn
22
BBT3 x 8BZn
BBT3 x 6CZn
B4 x 6BZn
BBT3 x 6BZn
B4 x 8 BZn
BBT3 x 6BZn
BBT4 x 6BZn
NUT HEX M4-ZMC3
Nut (attached to VOL)
Washer
(attached to VOL)
BBT3 x 8BZn
BBT3 x 8BZn
8
BBT3 x 6BZn
6
24
3
5
BBT3 x 8
BZn
BBT3 x 6BZn

8
PH-100 Service Manual
PH-100 PCB ASSEMBLIES
C16
FL05 C17
FL07
FL06
FL08
RJACK
RCONN
R22R21
R8
R6
C19
C20 R42
R26
C18
C4
R4
R25
85
14
C5
C8
C67
FL02
C6 C7
J80 R40
J81
J82
J84
FL01
IC1
R7
C66
R34
J83
C50
J87
C2
J85
J86
J89
J88
R3IC36
R32
C54
8
5
1
4
R1
C3 R2 R14R5 C13
R16 C38
J92
IC2
R35
R33C52
J96
C55
R19
R18C14
J97
C15
J95
J93J94
J99
C9
FL03
C56 C58
J101
J100
C27
LJACK
R38
C26
R37
85
14
LCONN RCAJ1RCAJ1
FL10
FL24 FL09 FL11
R51
FL04 C36
R36
FL23
R17
FL16
R61
RCAJ2RCAJ2
C45
C35 C37
FL17
FL12 FL13
R55
R63
R53
FL18
R65
RCAJ3RCAJ3
C47 C49
C39 C41
CN003
FL19
FL14
R57 R67
CN004
C51 C43
FL15
R59
FL20
R69
C53
C40
Q2
FL22
FL21
E
Q1
E
RCAJ4RCAJ4
R73
R71 R74
J102
C42
C70
R72
FIL5A
FIL5B
10
CH5REAR
1
BC007
FIL4A
FIL4B FIL3A
FIL3B FIL2A
FIL2B FIL1A
FIL1B
CH4REAR CH3REAR CH2REAR CH1REAR
12
CN009
12
BC009
Q6
J107 R82
R78 J106
R70 R76
D10
C64 R81
Q5 D3
D5 C65
E
E
C60
J105
D4
D9
R80Z1
Q4
Q3
E
E
~
D1
C63
C62
+
C61
J103
R83
-
R75
J104
BC1
~
151 6
13
13
13
C57
J98 C59
J90
CN002
CN007
J91
10
1
J54
BC005
J52
J51
J55
J53
C128
R191
J57
R204
J58
J56
C202 J59
10
1
1
R203
C204 C146
J62
J63
C137
R216
J35
R228
J64 J65
4
R215
J32
C206
J66
C208
C203
J61
J36
C207
C205
IC22 R293 IC24
J31
J30
J60
J33
58
1
4
58
1
4
58
1
4
58
1
4
58
1
4
58
C139
C133 J34 R222
IC26
C147
R295
C151
R221
C138 C142 J109
J10
J110
R234
J11
C143
C129
R210
IC23
J9
R209
J8
R294
R217
R296
R223
IC25
C148
J6
J7
IC27
C130 R211
R205
C134
R193
R199
R292
R194
FL4A
C123
C122
C125
R195
FL3B
R196
R202
C127
C126
R201
IC21
C135
C138
R213
R214
R207
R206
FL4B
R212
R208
C131
C132
C145
R226
R225
C144
R220
C140
R218
C141
R224
FL5A
R219
FL5B
R200
1
4
58
C201 C120
C121
J27
J26 R192
R179
C110 C200 C119
1
4
58
1
4
58
1
4
58
R186
IC18
R289
J28
C115
R180
R198
C111
R185
C116
J5
J4
IC20
R187
R290
C124
IC19
R181
R182
J29
R291
C118
C113
C114
R189
R197
R188
J1
R173
C106
C107
J3
J2
R288
R174
C112
R177
R175
IC17
R169
R178
C108
R170
C109
R172 R171
C104
C105
R183
R190
C117
FL1A
R176
R184
FL3A
FL2A
FL1B
CH2FRNT
CH1FRNT
FL2B
CH3FRNT
1
4
58
1
4
58
R168
J25
J23
R167
IC16
J24
C103
CH5FRNT
C102
R287
FL6A
CH4FRNT
C152
C154
R238
R237
C153
R229
R298
R235
C149
R230
C150
R236
R232
FL6B
R231
C161
C163
R249
R250
C162
IC29
CH6FRNT
FL7A
R241
R300
R247
C158
R242
C159
R248
R244
FL7B
R243
C166
C172
R261
R262
C171
IC31
CH7FRNT
FL8A
C170
R253
R302
R259
C167
R254
C168
R260
R256
FL8B
R255
C181
R273
R274
C180
IC33
CH8FRNT
FL9A
C179
R265
R304
R271
C176
R266
C177
R272
R268
FL9B
R267
C190
R285
R286
C189
IC35
CH9FRNT
FL10A
C184 C188
R277
R306
R283
R284
R278
C185
R280
FL10B
R279
C186
J22
C34
J21
R85
C31
C11
R46
C33
C30
R43
C29R44
VR1
CH10FRNT R47
C32
C28
IC4
14
5
8
R50
C209
R297
J39
R233
J38
J37
R227
J12
J13
1
4
58
1
4
58
1
4
58
1
4
58
1
4
58
1
4
58
1
4
58
1
4
58
J14
J15
J42
R245
C160
R246
IC28
C157 C156 R299
C211
C165
R258
C210 J40
J41 J43
J44
C212
IC30 C175C213
R252
R251
C169 J45
J16
R257
C164
R301
J18
J19
J17
R264
R270
C178
IC32
C174
C214
J46
R263
J47
C215
J48
R303
R269
R276 R275
IC34
C183
C187
R282 R281
R305
J49
C217
J50
J20
R79
LED1
C182 C216
10
J77
1
BC008
J79
J78
J108
J74 J75 J76
C173
10 J71
CN006
1
J72 J73
J69
R240
C155 R239
J67
J68
J70
1
10
C199 C198
C101
SW
HS
• Main / Phones Out / Power LED PCB

9
PH-100 Service Manual
C25
R91
C72
R88R87R99R100
R92
IC5 1
8
4
5
R90
C71R101
C76
R102
C73
R93
R94
VR3 JP76
R89
JP77
C24
R95
C75
R98
R109
R107
R106
R96
IC6 1
8
4
5
R110
C74
R97
VR4 C79
C23
R104
C78
R106
R117
R116
R115
R103
IC7 1
8
4
5
R118
C77
R105
VR5 C82
C22
R111
C81
R114
R125
R124
R123
R112
IC8 1
8
4
5
R126
C80
R113
VR6 C85
C21
R119
C84
R122
R133
R131
R132
R120
IC9 1
8
4
5
R134
C83
R121
VR7 C88
C191
R127
C87
R130
R141
R140
R139
R128
IC10 1
8
4
5
R142
C86
R129
VR8 C91
C192
R136
C90
R138
R149
R148
R147
R135
IC11 1
8
4
5
R150
C89
R137
VR9 C94
C193
R143
C93
R146R157
R156
R155
R144
IC12 1
8
4
5
R158
C92
R145
VR10
C97
C194
R152
C96
R154R165
R164
R163
R151
IC13 1
8
4
5
R166
C95
R153
VR11
C100
C195
R160
C99
R162 C197
C88
R15
R159
R11
C98
R161
VR12
R13
IC14 1
8
4
5C69
IC3
R12
PKLED C10
C12
JP31
R10
JP91
C196
VR2
JP95
1
8
4
5
JP93
JP94
JP92
R23 IC15
C46
R24
D7
D6
R27
R8
R31
C48
R30
R29
1
8
4
5
JP28 JP29
JP90
JP30
C44
JP89
JP75
JP74
JP63
JP64
JP71
JP70
JP72
JP73
JP57
JP67
JP59
JP60
JP62
JP61
JP66
JP65
JP69
JP88
JP54
JP82
JP56
JP86
JP85
JP87
JP86
JP5
JP27
JP51
JP46
JP45
JP47
JP48
JP50
JP49
JP53
JP52
JP25
JP26
10
1
JP37
JP39
BC002
JP38
JP23
JP22 JP33
JP34 JP41
JP40
JP42
JP43
JP32
JP44
JP36
JP35
JP24
JP3
JP12
JP80
JP13
JP19
JP21
JP20
JP5
JP4
JP17
JP18
JP10
JP9
JP11
JP14
JP16
JP15
JP2
JP1
JP6
JP7 JP8
1
2
S1
CH6REARA
CH7REARA
CH8REARA
CH9REARA
CH10REARA
FIL6A
CN008
FIL6B FIL8AFIL7B
FIL7A FIL8B FIL9A FIL10B
FIL10A
FIL9B
110
CN1
TM3
1
TM1
100V
120V
230V
TM2
3
S1
RISK OF FIRE REPLACE
FUSE AS MARKED
T250mAL 250V
T400mAL 250V
L1
F1
AC01
N
ACJACK
L2
L
• HP VOL PCB
• Power / Power SW PCB

10
PH-100 Service Manual
PH-100 PCB Assy Parts List
REF. PART No. PART NAME
AC01 8234110302 D, VT, VARISTOR, ERZVA7D431
ACJACK 8545001000 CONN, PL, JACK,AC-INLET, 3P,
IS-7014SB
BC002 CORDASSY, 10P, PY008, No.2
BC003 CORDASSY, 5P, PY008A0, No.3
BC004 CORDASSY, 6P, PY008A0, No.4
BC005, 006 CORDASSY, 10P, PY008, No.5
BC007 CORDASSY, 10P, PY008, No.7
BC008 CORDASSY, 10P, PY008, No.5
BC009 CORDASSY, 2P, PY008, No.9
BC1 CONN,A3963WV2-3P
C2, 3 ELECT, EGST226M1E01D110, 25V,
220M, T
C4, 5 CERAS, SL, 50V, 101J, T
C6 N/A
C7 ELECT, EGST226M1E01D110, 25V,
220M, T
C8, 9 N/A
C10 ELECT, EGST106M1V01D110, 35V,
100M, T
C11 N/A
C12 ELECT, EGST106M1V01D110, 35V,
100M, T
C13 ELECT, EGST226M1E01D110, 25V,
220M, T
C14 CERA, S, SL, 50V, 100J, T
C15 N/A
C16, 17 ELECT, EGST226M1E01D110, 25V,
220M, T
C18, 19 CERAS, SL, 50V, 101J, T
C20 ELECT, EGST226M1E01D110, 25V,
220M, T
C21~25 N/A
C26 ELECT, EGST226M1E01D110, 25V,
220M, T
C27 CERA, S, SL, 50V, 100J, T
C28 ELECT, SC, 25V, 220M ,T
C29 CERA, S, SL, 50V, 470J, T
C30 N/A
C31, 32 ELECT, SC, 25V, 220M, T
C33 CERA, S, SL, 50V, 470J, T
C34 ELECT, SC, 25V, 220M, T
C35~43 ELECT, EGST226M1E01D110, 25V,
220M, T
C44 CERAS, S,YF, 50V, 104Z, T
C45 ELECT, EGST226M1E01D110, 25V,
220M, T
C46 CERAS, S,YF, 50V, 104Z, T
C47 ELECT, EGST226M1E01D110, 25V,
220M, T
C48 CERAS, S,YF, 50V, 104Z, T
C49 ELECT, EGST226M1E01D110, 25V,
220M, T
C50 CERA, S, SL, 50V, 100J, T
C51 ELECT, EGST226M1E01D110, 25V,
220M, T
C52 CERA, S, SL, 50V, 100J, T
C53 ELECT, EGST226M1E01D110, 25V,
220M, T
REF. PART No. PART NAME
C54, 55 N/A
C56, 57 ELECT, EGST226M1E01D110, 25V,
220M, T
C58, 59 PEST, PEI308104, 100V, 104J,T
C60, 61 ELECT, EGST108M1E01G200, 25V,
102M
C62 ELECT, WP, 25V, 332M
C63 ELECT, EGST108M1E01G200, 25V,
102M
C64 ELECT, EGST225M1H01D110, 50V,
228M, T
C65 ELECT, SME BP, 50V, 228M, T
C66, 67 ELECT, EGST226M1E01D110, 25V,
220M, T
C68, 69 CERAS, S, YF, 50V, 104Z T
C70 ELECT, EGST107M1E01E110, 25V,
101M, T
C71 CERA, S, SL, 50V, 100J, T
C72 N/A
C73, 74 CERA, S, SL, 50V, 100J, T
C75 N/A
C76, 77 CERA, S, SL, 50V, 100J, T
C78 N/A
C79, 80 CERA, S, SL, 50V, 100J, T
C81 N/A
C82, 83 CERA, S, SL, 50V, 100J, T
C84 N/A
C85, 86 CERA, S, SL, 50V, 100J, T
C87 N/A
C88, 89 CERA, S, SL, 50V, 100J, T
C90 N/A
C91, 92 CERA, S, SL, 50V, 100J, T
C93 N/A
C94, 95 CERA, S, SL, 50V, 100J, T
C96 N/A
C97, 98 CERA, S, SL, 50V, 100J, T
C99 N/A
C100 CERA, S, S1, 50V, 100J, T
C101 CERA, S,YB, 50V, 102K, T
C102 ELECT, EGST476M1A01D110, 10V,
470M, T
C103 CERAS, S,YF, 50V, 104Z, T
C104 ELECT, SC, 10V, 331M, T
C105 PEST, S, 50V, 473K, T
C106 PEST, PEI308102, 100V, 102J, T
C107 ELECT, SC, 10V, 470M, T
C108 ELECT, SC, 10V, 331M, T
C109 PEST, S, 50V, 473K, T
C110 PEST, PEI308102, 100V, 102J,T
C111 ELECT, EGST476M1A01D110, 10V,
470M, T
C112 CERAS, S, YF, 50V, 104Z, T
C113 ELECT, SC, 10V, 331M, T
C114 PEST, S, 50V, 473K, T
C115 EST, PEI308102, 100V, 102J, T
C116 ELECT, SC, 10V, 470M, T
C117 ELECT, SC, 10V, 331M, T
C118 PEST, S, 50V, 473K, T

11
PH-100 Service Manual
REF. PART No. PART NAME
C119 PEST, PEI308102, 100V, 102J, T
C120 ELECT, EGST476M1A01D110, 10V,
470M, T
C121 CERAS, S,YF, 50V, 104Z, T
C122 ELECT, SC, 10V, 331M, T
C123 PEST, S, 50V, 473K,T
C124 PEST, PEI308102, 100V, 102J, T
C125 ELECT, SC, 10V, 470M, T
C126 ELECT, SC, 10V, 331M, T
C127 PEST, S, 50V, 473K,T
C128 PEST, PEI308102, 100V, 102J, T
C129 ELECT, EGST476M1A01D110, 10V,
470M, T
C130 CERAS, S,YF, 50V, 104Z, T
C131 ELECT, SC, 10V, 331M, T
C132 PEST, S, 50V, 473K,T
C133 PEST, PEI308102, 100V, 102J, T
C134 ELECT, SC, 10V, 470M, T
C135 ELECT, SC, 10V, 331M, T
C136 PEST, S, 50V, 473K,T
C137 PEST, PEI308102, 100V, 102J, T
C138 ELECT, EGST476M1A01D110, 10V,
470M, T
C139 CERAS, S,YF, 50V, 104Z, T
C140 ELECT, SC, 10V, 331M, T
C141 PEST, S, 50V, 473K,T
C142 PEST, PEI308102, 100V, 102J, T
C143 ELECT, SC, 10V, 470M, T
C144 ELECT, SC, 10V, 331M, T
C145 PEST, S, 50V, 473K,T
C146 PEST, PEI308102, 100V, 102J, T
C147 ELECT, EGST476M1A01D110, 10V,
470M, T
C148 CERAS, S,YF, 50V, 104Z, T
C149 ELECT, SC, 10V, 331M, T
C150 PEST, S, 50V, 473K,T
C151 PEST, PEI308102, 100V, 102J, T
C152 ELECT, SC, 10V, 470M, T
C153 ELECT, SC, 10V, 331M, T
C154 PEST, S, 50V, 473K,T
C155 PEST, PEI308102, 100V, 102J, T
C156 ELECT, EGST476M1A01D110, 10V,
470M, T
C157 CERAS, S,YF, 50V, 104Z, T
C158 ELECT, SC, 10V, 331M, T
C159 PEST, S, 50V, 473K,T
C160 PEST, PEI308102, 100V, 102J, T
C161 ELECT, SC, 10V, 470M, T
C162 ELECT, SC, 10V, 331M, T
C163 PEST, S, 50V, 473K,T
C164 PEST, PEI308102, 100V, 102J, T
C165 ELECT, EGST476M1A01D110, 10V,
470M, T
C166 CERAS, S,YF, 50V, 104Z, T
C167 ELECT, SC, 10V, 331M, T
C168 PEST, S, 50V, 473K,T
C169 PEST, PEI308102, 100V, 102J, T
C170 ELECT, SC, 10V, 470M, T
C171 ELECT, SC, 10V, 331M, T
C172 PEST, S, 50V, 473K,T
REF. PART No. PART NAME
C173 PEST, PEI308102, 100V, 102J, T
C174 ELECT, EGST476M1A01D110, 10V,
470M, T
C175 CERAS, S,YF, 50V, 104Z, T
C176 ELECT, SC, 10V, 331M, T
C177 PEST, S, 50V, 473K,T
C178 PEST, PEI308102, 100V, 102J, T
C179 ELECT, SC, 10V, 470M, T
C180 ELECT, SC, 10V, 331M, T
C181 PEST, S, 50V, 473K,T
C182 PEST, PEI308102, 100V, 102J, T
C183 ELECT, EGST476M1A01D110, 10V,
470M, T
C184 CERAS, S, YF, 50V, 104Z, T
C185 ELECT, SC, 10V, 331M, T
C186 PEST, S, 50V, 473K,T
C187 PEST, PEI308102, 100V, 102J, T
C188 ELECT, SC, 10V, 470M, T
C189 ELECT, SC, 10V, 331M, T
C190 PEST, S, 50V, 473K,T
C191~95 N/A
C196, 97 CERA, S, SL, 50V, 100J, T
C198~217 ELECT, EGST475M1H01D110, 50V,
478M, T
Ch1~10 8545009000 JACK, PHONE, MSJ-064-05A, SR,
FRNT AG
Ch1~5 8545007000 JACK, PHONE, MSJ-064-11D, SR
REAR
Ch6~10 8545007000 JACK, PHONE, MSJ-064-11D, SR
REARA
CN002 CONN,A2001WV2-10P
CN003 CONN,A2502WV2-5P
CN004 CONN,A2502WV2-6P
CN005~008 CONN,A2502WV2-10P
CN009 CONN,A2502WV2-2P
CN1 CONN, B3P5-VH
D1 8534005000 D,RS4031
D3, 4 8234501600 D, 1N4148ST, T
D6~10 8234501600 D, 1N4148ST, T
F1L1A~10A 8242186013 FILTER, T, EMI, LFM7B-M3R2T
F1L1B~10B 8242186013 FILTER, T, EMI, LFM7B-M3R2T
FL01~24 8242186013 FILTER, T, EMI, LFM7B-M3R2T
FL1A~10A 8242186013 FILTER, T, EMI, LFM7B-M3R2T
FL1B~10B 8242186013 FILTER, T, EMI, LFM7B-M3R2T
FUSE HOLD FUSE HOLDER, EYF-52BCT
IC1~15 8236031600 IC, NJM2068DD
IC16~35 8236046000 IC, NJM386BD
IC36 8236031600 IC, NJM2068DD
L1, 2 FERRITE, F5, R6H, 6.0X10.0, 2.5TS
L CONN 8545006000 JACK, CAN JY-5033B 030
LED1 8534001000 LED, 204HD/E, RED
L JACK 8545007000 JACK, PHONE, MSJ-064-11D, SR
PKLED 8534001000 LED, 204HD/E, RED
Q1, 2 8534002000 TR, 2SC4208A, QRS, T
Q3 8534003000 TR, 2SD2025
Q4 8534004000 TR, 2SB1237, PQR, T
Q5 8534002000 TR, 2SC4208A, QRS, T
Q6 8234000304 TR, 2SA1015Y, TPE2
R1 CARBON, R, CR, 1/6W, 393J, T265
R2~4 CARBON, R, CR, 1/6W, 103J, T265

12
PH-100 Service Manual
REF. PART No. PART NAME
R5, 6 CARBON, R, CR, 1/6W, 393J, T265
R7 CARBON, R, CR, 1/6W, 103J, T265
R8 CARBON, R, CR, 1/6W, 393J, T265
R10 CARBON, R, CR, 1/6W, 473J, T265
R11 CARBON, R, CR, 1/6W, 472J, T265
R12, 13 CARBON, R, CR, 1/6W, 473J, T265
R14 CARBON, R, CR, 1/6W, 103J, T265
R15 CARBON, R, CR, 1/6W, 473J, T265
R16 CARBON, R, CR, 1/6W, 103J, T265
R17 CARBON, R, CR, 1/6W, 104J, T265
R18, 19 CARBON, R, CR, 1/6W, 393J, T265
R21, 22 CARBON, R, CR, 1/6W, 103J, T265
R23 CARBON, R, CR, 1/6W, 153J, T265
R24 CARBON, R, CR, 1/6W, 101J, T265
R25, 26 CARBON, R, CR, 1/6W, 103J, T265
R27 CARBON, R, CR, 1/6W, 152J, T265
R28 CARBON, R, CR, 1/6W, 104J, T265
R29, 30 CARBON, R, CR, 1/6W, 273J, T265
R31~33 CARBON, R, CR, 1/6W, 224J, T265
R34, 35 CARBON, R, CR, 1/6W, 102J, T265
R36 CARBON, R, CR, 1/6W, 104J, T265
R37, 38 CARBON, R, CR, 1/6W, 393J, T265
R40 CARBON, R, CR, 1/6W, 103J, T265
R42, 43 CARBON, R, CR, 1/6W, 103J, T265
R44 CARBON, R, CR, 1/6W, 393J, T265
R46 CARBON, R, CR, 1/6W, 203J, T265
R47 CARBON, R, CR, 1/6W, 103J, T265
R50 CARBON, R, CR, 1/6W, 203J, T265
R51 CARBON, R, CR, 1/6W, 104J, T265
R53 CARBON, R, CR, 1/6W, 104J, T265
R55 CARBON, R, CR, 1/6W, 104J, T265
R57 CARBON, R, CR, 1/6W, 104J, T265
R59 CARBON, R, CR, 1/6W, 104J, T265
R61 CARBON, R, CR, 1/6W, 104J, T265
R63 CARBON, R, CR, 1/6W, 104J, T265
R65 CARBON, R, CR, 1/6W, 104J, T265
R67 CARBON, R, CR, 1/6W, 104J, T265
R69 CARBON, R, CR, 1/6W, 104J, T265
R70 CARBON, R, CR, 1/6W, 474J, T265
R71, 72 CARBON, R, CR, 1/6W, 203J, T265
R73, 74 CARBON, R, CR, 1/6W, 222J, T265
R75 CARBON, R, CR, 1/6W, 471J, T265
R76 CARBON, R, CR, 1/6W, 103J, T265
R78 CARBON, R, CR, 1/6W, 104J, T265
R79 CARBON, R, CR, 1/6W, 472J, T265
R80 CARBON, R, CR, 1/6W, 273J, T265
R81 CARBON, R, CR, 1/6W, 103J, T265
R82 CARBON, R, CR, 1/6W, 104J, T265
R83 5MM JUMPER
R85 CARBON, R, CR, 1/6W, 393J, T265
R87, 88 CARBON, R, CR, 1/6W, 393J, T265
R89 CARBON, R, CR, 1/6W, 104J, T265
R90 CARBON, R, CR, 1/6W, 332J, T265
R91, 92 CARBON, R, CR, 1/6W, 393J, T265
R93 CARBON, R, CR, 1/6W, 104J, T265
R94 CARBON, R, CR, 1/6W, 332J, T265
R95, 96 CARBON, R, CR, 1/6W, 393J, T265
R97 CARBON, R, CR, 1/6W, 104J, T265
R98 CARBON, R, CR, 1/6W, 332J, T265
R99, 100 CARBON, R, CR, 1/6W, 393J, T265
REF. PART No. PART NAME
R101 CARBON, R, CR, 1/6W, 104J, T265
R102 CARBON, R, CR, 1/6W, 332J, T265
R103, 104 CARBON, R, CR, 1/6W, 393J, T265
R105 CARBON, R, CR, 1/6W, 104J, T265
R106 CARBON, R, CR, 1/6W, 332J, T265
R107, 108 CARBON, R, CR, 1/6W, 393J, T265
R109 CARBON, R, CR, 1/6W, 104J, T265
R110 CARBON, R, CR, 1/6W, 332J, T265
R111, 112 CARBON, R, CR, 1/6W, 393J, T265
R113 CARBON, R, CR, 1/6W, 104J, T265
R114 CARBON, R, CR, 1/6W, 332J, T265
R115, 116 CARBON, R, CR, 1/6W, 393J, T265
R117 CARBON, R, CR, 1/6W, 104J, T265
R118 CARBON, R, CR, 1/6W, 332J, T265
R119, 120 CARBON, R, CR, 1/6W, 393J, T265
R121 CARBON, R, CR, 1/6W, 104J, T265
R122 CARBON, R, CR, 1/6W, 332J, T265
R123, 124 CARBON, R, CR, 1/6W, 393J, T265
R125 CARBON, R, CR, 1/6W, 104J, T265
R126 CARBON, R, CR, 1/6W, 332J, T265
R127, 128 CARBON, R, CR, 1/6W, 393J, T265
R129 CARBON, R, CR, 1/6W, 104J, T265
R130 CARBON, R, CR, 1/6W, 332J, T265
R131, 132 CARBON, R, CR, 1/6W, 393J, T265
R133 CARBON, R, CR, 1/6W, 104J, T265
R134 CARBON, R, CR, 1/6W, 332J, T265
R135, 136 CARBON, R, CR, 1/6W, 393J, T265
R137 CARBON, R, CR, 1/6W, 104J, T265
R138 CARBON, R, CR, 1/6W, 332J, T265
R139, 140 CARBON, R, CR, 1/6W, 393J, T265
R141 CARBON, R, CR, 1/6W, 104J, T265
R142 CARBON, R, CR, 1/6W, 332J, T265
R143, 144 CARBON, R, CR, 1/6W, 393J, T265
R145 CARBON, R, CR, 1/6W, 104J, T265
R146 CARBON, R, CR, 1/6W, 332J, T265
R147, 148 CARBON, R, CR, 1/6W, 393J, T265
R149 CARBON, R, CR, 1/6W, 104J, T265
R150 CARBON, R, CR, 1/6W, 332J, T265
R151, 152 CARBON, R, CR, 1/6W, 393J, T265
R153 CARBON, R, CR, 1/6W, 104J, T265
R154 CARBON, R, CR, 1/6W, 332J, T265
R155, 156 CARBON, R, CR, 1/6W, 393J, T265
R157 CARBON, R, CR, 1/6W, 104J, T265
R158 CARBON, R, CR, 1/6W, 332J, T265
R159, 160 CARBON, R, CR, 1/6W, 393J, T265
R161 CARBON, R, CR, 1/6W, 104J, T265
R162 CARBON, R, CR, 1/6W, 332J, T265
R163, 164 CARBON, R, CR, 1/6W, 393J, T265
R165 CARBON, R, CR, 1/6W, 104J, T265
R166~168 CARBON, R, CR, 1/6W, 332J, T265
R169 CARBON, R, CR, 1/6W, 103J, T265
R170 CARBON, R, CR, 1/6W, 100J, T265
R171 METAL, R,MO,1W,568J, M15
R172~174 CARBON, R, CR, 1/6W, 332J, T265
R175 CARBON, R, CR, 1/6W, 103J, T265
R176 METAL, R,MO,1W,568J, M15
R177 CARBON, R, CR, 1/6W, 100J, T265
R178~180 CARBON, R, CR, 1/6W, 332J, T265
R181 CARBON, R, CR, 1/6W, 103J, T265
R182 CARBON, R, CR, 1/6W, 100J, T265

13
PH-100 Service Manual
REF. PART No. PART NAME
R183 METAL, R,MO,1W,568J,M15
R184~186 CARBON, R, CR, 1/6W, 332J, T265
R187 CARBON, R, CR, 1/6W, 103J, T265
R188 METAL, R,MO,1W,568J,M15
R189 CARBON, R, CR, 1/6W, 100J, T265
R190~192 CARBON, R, CR, 1/6W, 332J, T265
R193 CARBON, R, CR, 1/6W, 103J, T265
R194 CARBON, R, CR, 1/6W, 100J, T265
R195 METAL, R,MO,1W,568J,M15
R196~198 CARBON, R, CR, 1/6W, 332J, T265
R199 CARBON, R, CR, 1/6W, 103J, T265
R200 METAL, R, MO, 1W, 568J, M15
R201~203 CARBON, R, CR, 1/6W, 100J, T265
R202~204 CARBON, R, CR, 1/6W, 332J, T265
R205 CARBON, R, CR, 1/6W, 103J, T265
R206 CARBON, R, CR, 1/6W, 100J, T265
R207 METAL, R,MO,1W,568J,M15
R208~210 CARBON, R, CR, 1/6W, 332J, T265
R211 CARBON, R, CR, 1/6W, 103J, T265
R212 METAL, R,MO,1W,568J,M15
R213 CARBON, R, CR, 1/6W, 100J, T265
R214~216 CARBON, R, CR, 1/6W, 332J, T265
R217 CARBON, R, CR, 1/6W, 103J, T265
R218 CARBON, R, CR, 1/6W, 100J, T265
R219 METAL, R,MO,1W,568J,M15
R220~222 CARBON, R, CR, 1/6W, 332J, T265
R223 CARBON, R, CR, 1/6W, 103J, T265
R224 METAL, R,MO,1W,568J,M15
R225 CARBON, R, CR, 1/6W, 100J, T265
R226~228 CARBON, R, CR, 1/6W, 332J, T265
R229 CARBON, R, CR, 1/6W, 103J, T265
R230 CARBON, R, CR, 1/6W, 100J, T265
R231 METAL, R,MO,1W,568J,M15
R232~234 CARBON, R, CR, 1/6W, 332J, T265
R235 CARBON, R, CR, 1/6W, 103J, T265
R236 METAL, R,MO,1W,568J,M15
R237 CARBON, R, CR, 1/6W, 100J, T265
R238~240 CARBON, R, CR, 1/6W, 332J, T265
R241 CARBON, R, CR, 1/6W, 103J, T265
R242 CARBON, R, CR, 1/6W, 100J, T265
R243 METAL, R,MO,1W,568J,M15
R244~246 CARBON, R, CR, 1/6W, 332J, T265
R247 CARBON, R, CR, 1/6W, 103J, T265
R248 METAL, R,MO,1W,568J,M15
R249 CARBON, R, CR, 1/6W, 100J, T265
R250~252 CARBON, R, CR, 1/6W, 332J, T265
R253 CARBON, R, CR, 1/6W, 103J, T265
R254 CARBON, R, CR, 1/6W, 100J, T265
R255 METAL, R,MO,1W,568J,M15
R256~258 CARBON, R, CR, 1/6W, 332J, T265
R259 CARBON, R, CR, 1/6W, 103J, T265
R260 METAL, R,MO,1W,568J,M15
R261 CARBON, R, CR, 1/6W, 100J, T265
R262~264 CARBON, R, CR, 1/6W, 332J, T265
R265 CARBON, R, CR, 1/6W, 103J, T265
R266 CARBON, R, CR, 1/6W, 100J, T265
R267 METAL, R,MO,1W,568J,M15
R268~270 CARBON, R, CR, 1/6W, 332J, T265
R271 CARBON, R, CR, 1/6W, 103J, T265
R272 METAL, R,MO,1W,568J,M15
REF. PART No. PART NAME
R273 CARBON, R, CR, 1/6W, 100J, T265
R274~276 CARBON, R, CR, 1/6W, 332J, T265
R277 CARBON, R, CR, 1/6W, 103J, T265
R278 CARBON, R, CR, 1/6W, 100J, T265
R279 METAL,R,MO,1W,568J, M15
R280~282 CARBON, R, CR, 1/6W, 332J, T265
R283 CARBON, R, CR, 1/6W, 103J, T265
R284 METAL,R,MO,1W,568J, M15
R285 CARBON, R, CR, 1/6W, 100J, T265
R286 CARBON, R, CR, 1/6W, 332J, T265
R287~306 CARBON, R, CR, 1/6W, 103J, T265
RCAJ1~J4 8545008000 JACK, RCA, 4P, RJ-1, 109 01-0300B
RCONN 8545006000 JACK, CAN, JY-5033B 030
RJACK 8545007000 JACK, PHONE, MSJ-064-11D, SR
S1 8553002000 SW, POWER, SDDLBIAID2
S1A, B CORDASSY, 1P, PY008
SW 8553003000 SW, SS010-P022MAM-PA9
U1 8236032105 IC, 220,AN, REGULATOR,
NJM7812FA
U2 8236034805 IC, 220,AN, REGULATOR,
NJM7912FA
VR1~12 8540001000 VR, RV0925G-20FA1-A5K-A, 5K x 2
Z1 8534006000 ZD, 18BSBST, T
Abbreviation
D: Diode
CONN: Connector
P: Penetrate mount
T: Taping device
ELECT: Electrolytic type
CERA: Ceramic type
PEST: Mylar type
J: 5% tolerance
K: 10% tolerance
L: L form
I: I form
CAN: Cannon
ZD: Zener diode
DG: Digital
AN: Analog

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PH-100 Service Manual
4. CIRCUIT & BLOCK DIAGRAMS
MAIN (1/2) / POWER (1/2) / POWER SW / POWER LED PCB, PH-100
MAIN PCB
POWER SW PCB
POWER LED
PCB
POWER PCB

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PH-100 Service Manual
HP VOL PCB, PH-100

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PH-100 Service Manual
MAIN (2/2) PCB, PH-100

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PH-100 Service Manual
PHONES OUT / POWER (2/2) PCB, PH-100
PHONES OUT PCB
POWER SW PCB

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PH-100 Service Manual
-10dBV
-2.3dB
STEREO/MONO
-12.3dBV
A
-10dBV
-2.3dB
-12.3dBV
A
-22.3dBV
INPUT
+5.8dB
-10dB
+11.8dB
AUX IN
-10dBV -16dBV
-6dB
PHONES 1
+3.8dB
+8.2dB
PHONES 2
PHONES 3
PHONES 4
PHONES 5
PHONES 6
PHONES 7
PHONES 8
PHONES 9
PHONES 10
PHONES 1 FRONT
PHONES 2 FRONT
PHONES 3 FRONT
PHONES 4 FRONT
PHONES 5 FRONT
PHONES 6 FRONT
PHONES 7 FRONT
PHONES 8 FRONT
PHONES 9 FRONT
PHONES 10 FRONT
PHONES 1 REAR
PHONES 2 REAR
PHONES 3 REAR
PHONES 4 REAR
PHONES 5 REAR
PHONES 6 REAR
PHONES 7 REAR
PHONES 8 REAR
PHONES 9 REAR
PHONES 10 REAR
CASCADE OUT
L
R-10dBV
PEAK LED
CHANNEL IN 1
-10dBV
CHANNEL IN 2
CHANNEL IN 3
CHANNEL IN 4
CHANNEL IN 5
CHANNEL IN 6
CHANNEL IN 7
CHANNEL IN 8
CHANNEL IN 9
CHANNEL IN 10
L/MONO
R
-10dBV
UNBAL -10dBV
INPUT R
BAL +4dBu
INPUT R
INPUT R
-10dBV
UNBAL -10dBV
INPUT L
BAL +4dBu
INPUT L/MONO
INPUT L 500mW max.
PH-100 BLOCK DIAGRAM

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PH-100 Service Manual
< NOTE >

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. 2003 8288808000