Page 1
Service Manual
Model
PH-50
PH-50
Headphone Amp Distributor
1
Page 2
PH-50
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.
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.
ATTENTION:
POUR ÉVITER LES CHOCS ÉLECTRIQUES,
INTRODUIRE LA LAME LA PLUS LARGE DE
LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER
JUSQU' AU FOND.
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.
“WARNING”
“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.”
SAFETY INSTRUCTIONS
Read instructions - All the safety and operating instruc-
1.
tions should be read before the appliance is operated.
Retain instructions - The safety and operating instructions
2.
should be retained for future reference.
Heed warnings - All warnings on the appliance and in the
3.
operating instructions should be adhered to.
Follow instructions - All operating and use instructions
4.
should be followed.
Water and Moisture - The appliance should not be used
5.
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
6.
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
7.
mounted to a wall or ceiling only as recommended by the
manufacturer.
Ventilation - The appliance should be situated so that its
8.
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.
2
Heat - The appliance should be situated away from heat
9.
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to a
10.
power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - The precautions that should
11.
be taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should be
12.
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 rec-
13.
ommended by the manufacturer.
Nonuse Periods - The power cord of the appliance should
14.
be unplugged from the outlet when left unused for a long
period of time.
Object and Liquid Entry - Care should be taken so that
15.
objects do not fall and liquids are not spilled into the enclosure through openings.
Damage requiring Service - The appliance should be ser-
16.
viced by qualified service personnel when:
The power supply cord or the plug has been damaged;
A.
or
Objects have fallen, or liquid has been spilled into the
B.
appliance; or
The appliance has been exposed to rain; or
C.
The appliance does not appear to operate normally or
D.
exhibits a marked changed in performance; or
The appliance has been dropped, or the enclosure
E.
damaged.
Servicing - The user should not attempt to service the ap-
17.
pliance beyond that described in the operating instructions. All other servicing should be referred to qualified
service personnel.
Page 3
TABLE OF CONTENTS
PH-50
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .
3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .
4. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .
4
5
6
10
NOTES
* Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining the Model PH-50.
* The following accessories are supplied with PH-50 as the standard accessories.
Owner's manual : 8288384000 (for export model)
Owner's manual : 8288385000 (for domestic model)
* Following is the packing material for the Model PH-50.
PACKING SIDE A PH-50 : 8228445000
CARTON BOX PH-50 : 8228721000
CAUTION
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.
3
Page 4
PH-50
1. SPECIFICATIONS
INPUT SECTION
INPUT (Balanced)
Connector XLR ( Hot : Pin 2 ) / Stereo phone ( Hot : tip )
Input level +4dBu / -10dBV(switchable)
Impedance 10 kΩ or more
INPUT (Unbalanced)
Connector RCA pin
Input level -10dBV
Impedance 10 kΩ or more
CHANNEL INPUT
Connector RCA pin
Input level -10dBV
Impedance 10 kΩ or more
AUX INPUT
Connector RCA pin
level -10dBV
Impedance 10 kΩ or more
OUTPUT SECTION
PHONES 1-5
Connector Stereo phone
Max. Output Level 500 mW or more ( 32 Ω load, Distortion 3.0 % or less )
Load Impedance 8 ~ 32 Ω
Frequency Response 30 ~ 20 kHz ± 2dB ( 32 Ω load, 1kHz, 200 mW )
S/N -65dBV or less (DIN AUDIO, OUTPUT VR : MIN)
-80dBV or less ( IHF-A, OUTPUT VR : MIN)
Distortion 0.1 % or less ( 32 Ω load, 1kHz, 200 mW )
CASCADE OUT
Connector RCA pin
Output level -10dBV ± 3dB (INPUT VR : CAL )
Frequency Response 30 ~ 20 kHz ± 1dB
S/N -85dBV or less (DIN AUDIO, OUTPUT VR : MIN)
-90dBV or less ( IHF-A, OUTPUT VR : MIN)
Distortion 0.05 % or less ( 1kHz, -10dBV )
Click Noise (Power on / off) -20dBVp-p or less (OUTPUT VR : MIN)
Shock Noise -40dBVp-p or less (Measure noise level when one side of appliance
is dropped 3 times from 5 cm height.)
Peak LED Indication +7dBV ± 3dB
GENERAL
Dimensions 210 (W) × 200 (D) × 43 (H) mm
Weight 1.9 kg
Power supply
JPN 100 VAC, 50/60 Hz
USA/CND 120 VAC, 60 Hz
EUR/UK 230 VAC, 50/60 Hz
Power consumption 8 W
* Specifications and appearance are subject to change without notice for product improvement.
4
Page 5
2. CONTROLS, INDICATORS & CONNECTORS
PH-50
HEADPHONE AMP DISTRIBUTOR
PEAK
CAL
PHONES
AUX IN
INPUT
MONOST
POWER
5
100
3
4521
5
100
5
100
5
100
5
100
5
100
5
100
< Front Panel >
PH-50
1
5678
1. Headphone output level control knob [PHONES 1-5]
2. AUX input level control knob [AUX IN]
3. Peak LED [PEAK
4. Power LED [POWER
]
]
234
5. Headphone jacks [PHONES 1-5]
6. Input image position selector switch [ST/MONO]
7. Input master level control knob [INPUT]
8. Power switch [POWER
]
< Rear Panel >
9 10
(-10dBV)
CHANNEL IN
L R L/MONO R
(-10dBV)
INPUT AUX IN
12345
LR
CASCADE OUT
11 12 13 14 15
9. Channel input jacks [CHANNEL IN 1-5]
10. Balanced input connector (XLR) [INPUT]
11. Cascade output jack [CASCADE OUT
12. Unbalanced input jack [INPUT
(-10dBV)
]
INPUT
LR
+4dBu -10dBV
(-10dBV)
(+4dBu/-10dBV)
PHONEXLR
HOT
T2
COLD
RS3
GND
1
RL
13. AUX input jacks [AUX IN]
14. Balanced input level selector switch [-4dBu/-10dBV]
]
15. Balanced input connector (Stereo phone) [INPUT]
5
Page 6
PH-50
3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST
PH-50 OVERALL EXPLODED VIEW & PARTS LIST
Ref. No. Part No. Description
1 8221262000 CASE, COVER, PH-50
2 8221264000 PANEL, FRONT, PH-50
3 8274174000 PCB Assy , MAIN, PH-50
4 8650800000 CORD, AC, USA/CND
8650801000 CORD, AC, EUR
8650802000 CORD, AC, UK
8650803000 CORD, AC, JPN
5 8207000208 BUSHING, SR-4N-4
6 8218775001 INSULATION SHEET, PH-50
7 8228775002 INSULATION SHEET B, PH-50
BBT 3x6 BZn
Ref. No. Part No. Description
8 8274175000 PCB Assy, VR, PH-50
9 8226198003 ROTARY, KNOB(C), G
10 8226198001 ROTARY, KNOB(A), R
11 8242256003 TRANS, POWER, 120V
8242256006 TRANS, POWER, 230V~
8242256010 TRANS, POWER, 100V
12 8221263000 CHASSIS, MAIN, PH-50
13 8253014007 SW, WL, PUSH, POWER, SDDLB-SPST
14 8207000318 PLASTY-FOOT, 3725
15 8226228000 BUTTON, PUSH, POWER
BBT 3x6 BZn
BBT 3x6 BZn
BBT 3x6 BZn
BBT 3x6 BZn
BBT 3x8 BZn
BBT 3x8 BZn
BBT 3x8 BZn
6
B 3x6 CZn
BBT 3x6 BZn
Page 7
PH-50 Parts List
• MAIN/VR PCBs
ICs
Ref. No. Part No. Description
U101~501 8236035803 IC, µPC4570HA
U102~502 8236046000 IC, NJM386BD
U152~552 8236046000 IC, NJM386BD
U601 8236035803 IC, µPC4570HA
U602 8236035803 IC, µPC4570HA
U605 8236035803 IC, µPC4570HA
U651 8236035803 IC, µPC4570HA
U701 8236035803 IC, µPC4570HA
U801 8236032005 IC, REGULATOR, NJM78M12FA
U802 8236034705 IC, REGULATOR, 79M12FA
TRANSISTORs
Ref. No. Part No. Description
Q601 8234108900 TR, 2SD1858, QR, T
Q602 8234108900 TR, 2SD1858, QR, T
Q603 8234108800 TR, 2SB1237, PQR, T
Q604 8234108900 TR, 2SD1858, QR, T
Q801 8234107600 TR, 2SC4549, NEC
DIODEs
Ref. No. Part No. Description
D601 8234106500 OPT, LED, RT3-222HCS
D602 8234500700 D, HT,1SS136
D603 8234500700 D, HT, 1SS136
D751 8234500700 D, HT, 1SS136
D752 8234106500 OPT, LED, RT3-222HCS
D753 8234500700 D, HT, 1SS136
D754 8234500700 D, HT, 1SS136
D801 8234108700 D, RB151
D802 8234106500 OPT, LED, RT3-222HCS
PH-50
RESISTORs
Ref. No. Part No. Description
R101~501 8240284001 VR, RK09K120A1NA, 5KΩA x 2
R110~510 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R111~511 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R112~512 8230138104 HT, CARBON, 1/4W, 100K, 5%
R113~513 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R114~514 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R115~515 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R116~516 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R117~517 8230138100 HT, CARBON, 1/4W, 10Ω, 5%
R118~518 8230111568 H, METAL, 5.6Ω, 5%
R119~519 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R150~550 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R151~551 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R152~552 8230138104 HT, CARBON, 1/4W, 100KΩ, 5%
R153~553 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R154~554 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R155~555 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R156~556 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R157~557 8230138100 HT, CARBON, 1/4W, 10Ω, 5%
R158~558 8230111568 H, META L, 5.6Ω, 5%
R159~559 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R601, 602 8240284001 VR, RK09K120A1NA, 5KΩA x 2
R610, 650 8230138104 HT, CARBON, 1/4W, 100KΩ, 5%
R611, 651 8230138103 HT,CARBON, 1/4W, 10KΩ, 5%
R612, 652 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R613, 653 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R614, 654 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R615, 655 8230138104 HT, CARBON, 1/4W, 100KΩ, 5%
R616, 656 8230138104 HT, CARBON, 1/4W, 100KΩ, 5%
R617, 657 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R618, 658 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R619, 659 8230138822 HT, CARBON, 1/4W, 8.2KΩ, 5%
R620, 660 8230138822 HT, CARBON, 1/4W, 8.2KΩ, 5%
R621, 661 8230138822 HT, CARBON, 1/4W, 8.2KΩ, 5%
R622, 662 8230138822 HT, CARBON, 1/4W, 8.2KΩ, 5%
R623, 663 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R624, 664 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R625, 665 8230138102 HT, CARBON, 1/4W, 1KΩ, 5%
R626, 666 8230138104 HT, CARBON, 1/4W, 100KΩ, 5%
R627, 667 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R628, 668 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R629, 669 8230138332 HT, CARBON, 1/4W, 3.3KΩ, 5%
R630, 670 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R631, 671 8230138103 HT, CARBON, 1/4W, 10KΩ, 5%
R632, 672 8230138393 HT, CARBON, 1/4W, 39KΩ, 5%
R633, 673 8230138101 HT, CARBON, 1/4W, 100Ω, 5%
7
Page 8
PH-50
CAPACITORs
ALU = Electrolytic
CER = Ceramic type
PES = Mylar type
Ref. No. Part No. Description
C101~501 8232050100 CER, 50V, 10PF, +-.5PF, SL
C102~502 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C103~503 8232901102 PES, 50V, 0.001µF, 5%, AMZV
C104~504 8232143337 ALU, 16V, 330µF, 20%, SME-VB
C105~505 8232142476 ALU, 10V, 47µF, 20%, SME-VB
C107 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C108 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C109~509 8232901473 PES, 50V, 0.047µF, 5%, AMZV
C151~551 8232050100 CER, 50V, 10PF, +-.5PF, SL
C153~553 8232901102 PES, 50V, 0.001µF, 5%, AMZV
C154~554 8232143337 ALU, 16V, 330µF, 20%, SME-VB
C155~555 8232142476 ALU, 10V, 47µF, 20%, SME-VB
C159~559 8232901473 PES, 50V, 0.047µF, 5%, AMZV
C307 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C308 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C601, 651 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C602, 652 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C603, 653 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C604, 654 8232050101 CER, 50V, 100PF, 5%, SL
C605, 655 8232050101 CER, 50V, 100PF, 5%, SL
C606, 656 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C607, 657 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C608, 658 8232050100 CER, 50V, 10PF, +-.5PF, SL
C610, 660 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C611, 661 8232050100 CER, 50V, 10PF, +-.5PF, SL
C612, 662 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C614, 664 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C615, 665 8232050100 CER, 50V, 10PF, +-.5PF, SL
C617, 667 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C620 8232153225 ALU, 50V, 2.2µF, 20%, BP, SME-VB
C621 8232146225 ALU, 50V, 2.2µF, 20%, SME-VB
C622 8232146225 ALU, 50V, 2.2µF, 20%, SME-VB
C701~705 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C751~753 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C801 8232096108 ALU, 25V, 1000µF, 20%, SME-VB
C802 8232096338 ALU, 25V, 3300µF, 20%, SME
C803 8232096108 ALU, 25V, 1000µF, 20%, SME-VB
C804 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C805 8232804104 CER, 25V, 0.1µF, +80-20%, YF
C806 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C807 8232144226 ALU, 25V, 22µF, 20%, SME-VB
C808 8232901473 PES, 50V, 0.047µF, 5%, AMZV
C809 8232901473 PES, 50V, 0.047µF, 5%, AMZV
C810 8232096108 ALU, 25V, 1000µF, 20%, SME-VB
MISCELLANEOUS
Ref. No. Part No. Description
CN803 8745503003 CONN, XH 3P (87003048)
J101~601 8245337000 CONN, PHONE JACK, STEREO
J602 8245268002 CONN, PL, J A CK, XLR31, NC3FAH2
J603 8245311004 CONN, RCA, 4P, YKC21-3084
J651 8245337000 CONN, PHONE JACK, STEREO
J652 8245268002 CONN, PL, J A CK, XLR31, NC3FAH2
J701 8245311006 CONN, RCA, 6P, YKC21-3154
J706 8245311001 CONN, RCA, 1P, YKB11-0273
S601 8253467000 SW, SS010-P022MAM-PA9
S602 8253467000 SW, SS010-P022MAM-PA9
W601 8277473001 CORD, SCN-SCN, 8P x 200
W602 8277473001 CORD, SCN-SCN, 8P x 200
W603 8277473002 CORD, SCN-SCN,10P x 200
8207012800 HEATSINK, PC1115-25
8
Page 9
PH-50 PCB PATTERN DRAWING
PH-50
9
Page 10
10
PH-50
4. CIRCUIT & BLOCK DIAGRAMS
UNBAL.IN L
-10dBV
BAL.IN L
+4dBu/-10dBV
CANNON
AUX IN L
-10dBV
-10dBV
BAL.IN L
+4dBu/-10dBV
J652
CANNON
AUX IN R
-10dBV
CHANNEL IN 1
-10dBV
CHANNEL IN 2
-10dBV
CHANNEL IN 3
-10dBV
CHANNEL IN 4
-10dBV
CHANNEL IN 5
-10dBV
CASCADE OUT L
-10dBV
CASCADE OUT R
-10dBV
To Transf ormer
J601
HTJ064
3
J602
J651
HTJ064
3
1
RCA JACK SW
J603B
RCA 6P
J604B
RCA 4P
J604D
RCA 4P
J605
J701
RCA 6P
J701
RCA 6P
J701
RCA 6P
J603
RCA 4P
J603
RCA 4P
J701
RCA 6P
J701
RCA 6P
1
R666
100k
1
CN802
XH3P
+B2
D802
L-934ID-5V
+B2
U605A
R756
4570A
R601
5kAA
U801
78M12AHF
IN
G
G
IN
OUT
U802
79M12AHF
3
4
7
6
OUT
2
3
C611
R632
+B2
-B2
C661
10p
R672 39k
+B2
1
1
D752
R759
L-934ID-5V
4.7k
2
C753
-B2
0.1u
R673
+B2
-B2
100
C667
25V/22u
R633
100
C617
25V/22u
C806
25V/22u
C807
25V/22u
-B2
10p
39k
U602A
4570A
1
2
5
C612
0.1u
R631
10k
9
8
U602B
4570A
R671
10k
C804
0.1u
C805
0.1u
C601
25V/22u
3
R610
100k
R611
10k
2
3
1
2
1
3
6
2
3
1
2
3
2
8
7
5
4
2
1
5
4
2
9
6
1
2
3
C602
R612
25V/22u
10k
R613
10k
R614
25V/22u
10k
R615
R616
100k
100k
C614
25V/22u
R626
100k
C651
R650
25V/22u
100k
R651
10k
R652
10k
R653
10k
R654
25V/22u
10k
R656
100k
R655
100k
R667
C664
39k
25V/22u
C701
25V/22u
R701
100k
C702
25V/22u
R702
100k
C703
25V/22u
R703
100k
C704
25V/22u
R704
100k
C705
25V/22u
R705
100k
R801
F2.2
C808
0.0047
C809
0.0047
R802
F2.2
C603
R617
10k
R627
39k
C652
25V/22u
C653
R657
10k
R618 10k
+B2
3
4
-B2
C604
100p
C615
10p
R628 39k
+B2
3
1
4
5
-B2
R658
7
6
C654
100p
C665 10p
R668 39k
+B2
9
7
6
Q601
D1858
Q602
D1858
421
U701B
4570A
3
1
5
2
8
RB151
C605
100p
U601A
4570A
2
C606
0.1u
U701A
4570A
C662
0.1u
C655
100p
10k
+B2
9
8
U601B
4570A
R638
3.3k
R639
3.3k
D801
C607
25V/22u
R629
3.3k
C657
25V/22u
R669
3.3k
R634
27k
C620
50V/2.2u BP
R803
100
R804
100
S601A
SSSF 2-2
2
S601B
SSSF 2-2
5
D602
1SS133
R623
10k
R619
-10dBV
8.2k
3
1
+4dBu
R620
8.2k
R659
-10dBV
8.2k
6
4
+4dBu
R660
8.2k
R636
R635
100k
100k
R637
10k
D603
1SS133
Q604
D1858
C608
10p
R621
8.2k
10k
R624
+B2
R622
39k
1
3
2
4
U651A
5
4570A
0.1u
C656
-B2
R663
10k
C658
10p
R661
R664
8.2k
10k
+B2
R662
39k
7
9
8
6
U651B
4570A
R640
2.2k
R641
2.2k
Q603
D601
B1237
L-934ID-5V
C622
50V/2.2u
C802
C621
25V/3300u
50V/2.2u
25V/1000u
25V/1000u
C803
S602B
SSSF 2-2
C610
25V/22u
R625
1K
R665
1K
R805
100
C801
6
4
5
215
Q801
C4549
S602A
SSSF 2-2
1
+B1
3
2
34
67
C660
25V/22u
3
C810
25V/1000u
2
R630
10k
R670
10k
R754
4.7k
1
100k
3
4
5
R757
R755
100
4.7k
R758
0
1
2
3
4
5
6
7
8
62903579
1
2
3
4
5
6
7
8
62903579
R753
27k
+B2
D751
9
7
U605B
4570A
R602
5kAA
D754
8
1SS133
6
D753
1SS133
R752
R751
27k
220k
34
2
1
67
1SS133
C751
0.1u
5
1
2
3
4
5
6
7
8
W601
1
2
3
4
5
6
7
8
W602
C101
10p
R112 100k
+B2
R110
39k
3
1
2
4
R111
5
39k
C102
-B2
0.1u
10p
C151
R151
R152 100k
39k
R150
+B2
39k
7
9
8
6
U101B
4570A
C201
10p
R212 100k
+B2
R210
39k
3
1
2
4
R211
5
39k
-B2
10p
C251
R251
R252 100k
39k
R250
+B2
39k
7
9
8
6
U201B
4570A
C301
10p
R312 100k
+B2
R310
39k
1
3
2
4
R311
5
39k
C302
-B2
0.1u
10p
C351
R351
R352 100k
39k
R350
+B2
39k
7
9
8
6
U301B
4570A
C401
10p
R412 100k
+B2
3
1
2
4
R410
39k
R411
5
39k
C402
-B2
0.1u
10p
C451
R452 100k
R451
R450
39k
+B2
39k
9
7
8
6
U401B
4570A
10p
C501
R512 100k
+B2
R510
39k
3
1
2
4
R511
5
39k
C502
0.1u
-B2
10p
C551
R551
R552 100k
39k
R550
+B2
39k
9
7
8
6
U501B
4570A
R113
3.3k
U101A
4570A
5
7
4
1
R101
5kAA
6
3
2
R153
3.3k
U201A
4570A
R213
3.3k
C202
0.1u
5
7
4
1
R201
5kAA
6
3
2
R253
3.3k
1
2
R313
3
4
3.3k
5
6
7
U301A
4570A
U401A
4570A
4570A
U501A
4
R301
5kAA
3
4
R401
5kAA
3
4
R501
5kAA
3
8
9
10
W603
5
7
1
6
2
R353
3.3k
R413
3.3k
5
2
5
2
62903580
7
1
6
R453
3.3k
R513
3.3k
7
1
6
R553
3.3k
R114
3.3k
R115
3.3k
R154
3.3k
R155
3.3k
R214
3.3k
R215
3.3k
R254
3.3k
R255
3.3k
R314
1
2
3
4
5
6
7
8
9
10
R354
3.3k
R355
3.3k
R414
3.3k
R415
3.3K
R454
3.3k
R455
3.3k
R514
3.3k
R515
3.3k
R554
3.3k
R555
3.3k
R116
10k
C103
U102
1
G
G2
2
-
P
3
0.001u
+
B
4
E
O
386B
C105
10v/47u
R156
10k
C153
U152
1
G
G2
2
-
P
3
0.001u
+
B
4
E
O
386B
C155
10v/47u
R216
10k
C203
U202
1
G2
G
2
-
P
3
+
B
0.001u
4O5
E
386B
C205
10v/47u
R256
10k
C253
U252
1
G
G2
2
-
P
3
0.001u
+
B
4
E
O
386B
C255
10v/47u
R316
3.3k
0.001u
R315
3.3k
C403
C453
C503
0.001u
C553
C303
C353
0.001u
0.001u
0.001u
0.001u
10k
U302
1
G
2
-
3
+
4
E
386B
R356
10k
U352
1
G
2
-
3
+
4
E
386B
R416
10k
U402
1
G
2
-
3
+
4
E
386B
R456
10k
U452
1
G
2
-
3
+
4
E
386B
R516
U502
1
G
2
-
3
+
4
E
386B
R556
10k
U552
1
G
2
-
3
+
4O5
E
386B
G2
P
B
O
C305
10v/47u
G2
P
B
O
C355
10v/47u
G2
P
B
O
C405
10v/47u
G2
P
B
O
C455
10v/47u
10k
G2
P
B
O
C505
10v/47u
G2
P
B
C555
10v/47u
+B1
8
7
6
5
8
7
6
5
8
7
6
8
7
6
5
8
7
6
5
8
7
6
5
8
7
6
5
8
7
6
5
8
7
6
5
8
7
6
C104
R118
16V/330u
R117
C107
10
C109
0.1u
0.047u
C154
16V/330u
C159
0.047u
R157
10
+B1
C204
16V/330u
R217
C108
10
C209
0.1u
0.047u
R259
3.3k
C254
16V/330u
C259
0.047u
R257
10
+B1
C304
16V/330u
R317
C307
10
C309
0.1u
0.047u
R359
3.3k
C354
16V/330u
C359
0.047u
R357
10
+B1
C404
16V/330u
R417
C308
10
0.047u
0.047u
+B1
R419
C409
3.3k
0.047
R459
3.3k
C454
16V/330u
C459
R457
10
C504
16V/330u
R517
10
R519
C509
3.3k
0.047u
C554
16V/330u
C559
R557
10
0.1u
C752
0.1u
J101
5.6
2
3
1
PHONES OUT 1
R119
3.3k
HTJ064
R159
3.3k
R158
5.6
R218
J201
5.6
2
3
1
PHONES OUT 2
R219
3.3k
HTJ064
R258
5.6
R318
J301
5.6
2
3
1
PHONES OUT 3
R319
3.3k
HTJ064
R358
5.6
R418
J401
5.6
2
3
1
PHONES OUT 4
HTJ064
R458
5.6
R518
J501
5.6
2
3
1
PHONES OUT 5
HTJ064
R559
3.3k
R558
5.6
Page 11
BLOCK DIAGRAM
11
PH-50
Page 12
PH-50
12
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 JUNE 1998 8288774000
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