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Fostex PH-50 Service Manual
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Fostex PH-50 Service Manual

Headphone amp distributor
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PH-50
Service Manual
Model
PH-50
Headphone Amp Distributor
1

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Summary of Contents for Fostex PH-50

  • Page 1 PH-50 Service Manual Model PH-50 Headphone Amp Distributor...

  • Page 2: Safety Instructions

    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. 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”...
  • Page 3 4. CIRCUIT & BLOCK DIAGRAMS ......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.

  • Page 4: Specifications

    PH-50 1. SPECIFICATIONS INPUT SECTION INPUT (Balanced) Connector Input level Impedance INPUT (Unbalanced) Connector Input level Impedance CHANNEL INPUT Connector Input level Impedance AUX INPUT Connector level Impedance OUTPUT SECTION PHONES 1-5 Connector Max. Output Level Load Impedance Frequency Response...

  • Page 5: Front Panel

    8. Power switch [ POWER ] +4dBu -10dBV L/MONO AUX IN (-10dBV) 13. AUX input jacks [AUX IN] 14. Balanced input level selector switch [-4dBu/-10dBV] 15. Balanced input connector (Stereo phone) [INPUT] PH-50 HEADPHONE AMP DISTRIBUTOR PEAK POWER AUX IN MONO INPUT INPUT (+4dBu/-10dBV)
  • Page 6 PH-50 3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST PH-50 OVERALL EXPLODED VIEW & PARTS LIST Ref. No. Part No. Description 8221262000 CASE, COVER, PH-50 8221264000 PANEL, FRONT, PH-50 8274174000 PCB Assy, MAIN, PH-50 8650800000 CORD, AC, USA/CND 8650801000 CORD, AC, EUR...
  • Page 7 PH-50 Parts List • MAIN/VR PCBs Ref. No. Part No. Description U101~501 8236035803 IC, PC4570HA U102~502 8236046000 IC, NJM386BD U152~552 8236046000 IC, NJM386BD U601 8236035803 IC, PC4570HA U602 8236035803 IC, PC4570HA U605 8236035803 IC, PC4570HA U651 8236035803 IC, PC4570HA U701...
  • 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, 0.1 F, +80-20%, YF C103~503 8232901102 PES, 50V, 0.001 F, 5%, AMZV...
  • Page 9 PH-50 PCB PATTERN DRAWING...
  • Page 10 4. CIRCUIT & BLOCK DIAGRAMS C601 J603B R623 25V/22u UNBAL.IN L RCA 6P -10dBV C605 R610 C608 100p 100k S601A SSSF 2-2 R611 J601 R621 R619 R618 -10dBV 8.2k R624 10k 8.2k C602 U601A R612 HTJ064 25V/22u 4570A BAL.IN L +4dBu R620 R622...
  • Page 11 BLOCK DIAGRAM...
  • Page 12 PH-50 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...