Sony BM-87DST Service Manual
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Sony BM-87DST Service Manual

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SERVICE MANUAL
Ver 1.1 2003.06
Sony Corporation
9-927-638-12
Personal Audio Company
2003F02-1
Published by Sony Engineering Corporation
© 2003.06
BM-87DST
Model Name Using Similar Machanism
Tape Transport Mechanism Type
SPECIFICATIONS
DICTATOR/ TRANSCRIBER
US Model
Australian Model
NEW
MB-87-59

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  • Page 1 BM-87DST SERVICE MANUAL US Model Australian Model Ver 1.1 2003.06 Model Name Using Similar Machanism Tape Transport Mechanism Type MB-87-59 SPECIFICATIONS DICTATOR/ TRANSCRIBER Sony Corporation 9-927-638-12 Personal Audio Company 2003F02-1 Published by Sony Engineering Corporation © 2003.06...

  • Page 2: Table Of Contents

    COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: General

    SECTION 2 This section is extracted from GENERAL instruction manual. – 3 –...
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  • Page 13: Disassembly

    SECTION 3 DISASSEMBLY The equipment can be remo ved using the f ollo wing pr ocedure . Cabinet (rear) ASSY Main board, Connecter (12P) board Cabinet (front) ASSY LED board Servo board, “Head,magnetic (rec/PB/erase) (HRP901)”, Mechanism deck Motor (F/R) ASSY (M902) Belt (FWD), Belt (F/R) Motor ASSY (FWD) (M901) Note : Follow the disassembly procedure in the numerical order given.

  • Page 14: Led Board

    3-3. LED BOARD Cabinet (front) ASSY LED board 1 Screws (+B 2x4) 3-4. MECHANISM DECK 1 Open Lid ASSY, cassette Cabinet (front) ASSY Mechanism deck – 14 –...

  • Page 15: Servo Board, "Head Magnetic (Rec/Pb/Erase) (Hrp901)", Motor (F/R) Assy (M902)

    3-5. SERVO BOARD, “HEAD, MAGNETIC (REC / PB / ERASE) (HRP901)”, MOTOR (F/R) ASSY (M902) 4 Screw (lock) 3 Screw (+P 2x2.5) Motor (F/R) ASSY (M902) Head, magnetic (rec/PB/erace) (HRP901) 6 Claws Mechanism deck Servo board 1 Screw (+BTP 2.6x6) 3-6.

  • Page 16: Motor (Fwd) Assy(M901)

    3-7. MOTOR (FWD) ASSY (M901) Motor (FWD) ASSY (M901) Cushion (M) Mechanism deck – 16 –...

  • Page 17: Mechanical Adjustments

    SECTION 4 MECHANICAL ADJUSTMENTS PRECAUTION Forward Torque Adjustment 1. Clean the following parts with a denatured alcohol moistened Torque meter Meter reading Procedure swab : Adjust the forward torque by record/playback/erase head pinch roller 20 to 45 g • cm CQ-102C replace the spacer shown in rubber belts...

  • Page 18: Electrical Adjustments

    SECTION 5 ELECTRICAL ADJUSTMENTS PRECAUTION Tape Speed Adjustment 1. Switches and controls should be to set to the positions as fol- Setup : lows unless otherwise specified. Mode : Playback (LISTEN) • Switch positions POWER switch : ON test tape WS-48 AUTO STOP switch : ON...

  • Page 19: Diagrams

    SECTION 6 DIAGRAMS 6-1. EXPLANATION OF IC TERMINALS IC109 µPD75308GF-J16-3B9 (SYSTEM CONTROL) Pin No. Pin name Description 1 – 12 S12 – S23 – Not used (OPEN). 13 – 16 KOUT 0 – KOUT 3 Key scan output. MA50 - OUT –...
  • Page 20 Pin No. Pin name Description LTR signal output. At LTR oscillating : 5.3V Output 80Hz for LTR-OUT three seconds. At the other : 5.3V REC-OUT DICT, TEL-REC control output. At DICT, TEL-REC : “ H ” At the other : “ L ” TEL-OUT TEL-REC control output.

  • Page 21: Block Diagram

    BM-87DST 6-2. BLOCK DIAGRAM Note: • Signal path. : PB : REC – 21 – – 22 –...

  • Page 22: Printed Wiring Boards (Servo Section)

    BM-87DST 6-3. PRINTED WIRING BOARDS (SERVO SECTION) Semiconductor Location Ref. No. Location D601 D604 [SERVO BOARD] D605 D606 IC601 PM902 IC602 IC603 PLUNGER D605 IC604 C615 C608 D601 J611 Q601 Q618 Q601 Q602 Q603 Q604 Q605 IC601 M901 Q619 Q606...

  • Page 23: Schematic Diagram (Servo Section)

    BM-87DST 6-4. SCHEMATIC DIAGRAM (SERVO SECTION) Waveform 2.8Vp-p 3.8 msec VOLT/DIV : 0.5 V AC M901 TIME/DIV : 2 msec Note: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 24: Printed Wiring Boards (Main Section)

    BM-87DST 6-5. PRINTED WIRING BOARDS (MAIN SECTION) [LED BOARD] SERVO BOARD J102 1-677-762- Semiconductor Location (Page 24) (Page 24) (Page 24) Ref. No. Location Ref. No. Location SP901 D101 IC108 SPEAKER (11) D102 IC109 LED303 LED302 LED301 D104 IC110 [MAIN BOARD]...

  • Page 25: Schematic Diagram (Main Section)

    BM-87DST 6-6. SCHEMATIC DIAGRAM (MAIN SECTION) Waveforms 3 Vp-p 4.19 MHz VOLT/DIV : 0.5 V AC IC109 tl X2 TIME/DIV : 50 nsec 50 Vp-p 12.5 µ sec VOLT/DIV : 2 V AC (X10ATT : ON) T101 TIME/DIV : 5 µsec Note: •...

  • Page 26: Cabinet Section

    12P CONNECTOR SECTION 8 SECTION 7 MAIN ELECTRICAL PARTS LIST EXPLODED VIEWS NOTE : 7-2. MECHANISM DECK SECTION (1) 7-3. MECHANISM DECK SECTION (2) NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS • -XX, -X mean standardized parts, so they •...
  • Page 27 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C161 1-163-117-00 CERAMIC CHIP 100PF D104 8-719-914-43 DIODE DAN202K C162 1-163-239-11 CERAMIC CHIP 33PF D105 8-719-914-43 DIODE DAN202K C163 1-163-239-11 CERAMIC CHIP 33PF D106 8-719-914-43 DIODE DAN202K C164 1-164-004-11 CERAMIC CHIP 0.1uF...
  • Page 28 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q119 8-729-027-46 TRANSISTOR DTC114YKA-T146 R150 1-216-081-00 METAL CHIP 1/10W Q120 8-729-027-46 TRANSISTOR DTC114YKA-T146 R151 1-216-115-00 METAL CHIP 560K 1/10W Q121 8-729-901-46 TRANSISTOR DTA114YK R152 1-216-077-91 RES-CHIP 1/10W Q122 8-729-901-46 TRANSISTOR DTA114YK R153...
  • Page 29 MAIN SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R209 1-216-065-91 RES-CHIP 4.7K 1/10W C609 1-126-513-11 ELECT 47uF 6.3V C610 1-115-872-11 ELECT 2.2uF R210 1-216-065-91 RES-CHIP 4.7K 1/10W C611 1-163-251-11 CERAMIC CHIP 100PF R211 1-216-027-00 METAL CHIP 1/10W C613 1-163-077-00 CERAMIC CHIP...
  • Page 30 BM-87DST Ver 1.1 2003.06 SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R613 1-216-059-00 METAL CHIP 2.7K 1/10W PM901 1-454-459-31 SOLENOID, PLUNGER (STOP) R615 1-216-053-00 METAL CHIP 1.5K 1/10W PM902 1-454-459-21 SOLENOID, PLUNGER (FWD) R616...
  • Page 31 BM-87DST MEMO – 43 –...
  • Page 32 BM-87DST REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2000.01...

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