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Sony BM-21 Service Manual
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Sony BM-21 Service Manual

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SERVICE MANUAL
Ver. 1.1 2005.08
Sony Corporation
9-959-363-12
Personal Audio Group
2005H16-1
Published by Sony Engineering Corporation
© 2005.08
BM-21/23
Photo: BM-23
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
NEW
MB-23-101
PORTABLE DICTATOR
BM-21/23
BM-23
BM-21/23
BM-23

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Summary of Contents for Sony BM-21

  • Page 1 Ver. 1.1 2005.08 Canadian Model BM-23 AEP Model BM-21/23 UK Model BM-23 Photo: BM-23 Model Name Using Similar Mechanism Tape Transport Mechanism Type MB-23-101 SPECIFICATIONS PORTABLE DICTATOR Sony Corporation 9-959-363-12 Personal Audio Group 2005H16-1 Published by Sony Engineering Corporation © 2005.08...
  • Page 27 BM-21/23 US Model BM-21/23 Canadian Model SERVICE MANUAL BM-23 AEP Model Ver. 1.1 2005.08 BM-21/23 UK Model BM-23 SUPPLEMENT-2 Subject: Addition of BM-23 environmental measure model (only for AEP model) 9-959-363-82...

  • Page 28: Audio Board

    BM-21/23 BM-23 environmental measure model (only for AEP model) This supplement-2 describes disassembly, mechanical adjustments, electrical adjustments, diagrams, exploded views and electrical parts list about BM-23 environmental measure model. Refer to original service manual (9-959-363-1[ ]) for other information. • How to distingnish...

  • Page 29: Section 1 Disassembly

    BM-21/23 SECTION 1 DISASSEMBLY 1-1. DISASSEMBLY FLOW • This set can be disassembled in the order shown below. 1-2. CABINET (REAR) BLOCK ASSEMBLY (Page 4) 1-3. CONTROL PANEL BLOCK ASSEMBLY 1-6. HOLDER PANEL ASSEMBLY (Page 5) (Page 7) 1-4. AUDIO BOARD (Page 6) 1-5.

  • Page 30: Cabinet (Rear) Block Assembly

    BM-21/23 Note: Follow the disassembly procedure in the numerical order given. 1-2. CABINET (REAR) BLOCK ASSEMBLY 3 two screws (+BTP 1.7 × 10) 2 screw (M 1.4 × 5.0) 5 cabinet (rear) block assembly note : When attaching the cabinet (rear)
  • Page 31 BM-21/23 1-3. CONTROL PANEL BLOCK ASSEMBLY 1 screw (M1.4) control button assembly 4 lever (lock) AUDIO board 6 Remove the control panel block assembly in the direction of the arrow. 2 two claws 5 control button assembly 3 claw PRECAUTION DURING CONTROL PANEL BLOCK...
  • Page 32 BM-21/23 1-4. AUDIO BOARD 2 screw (1.7 x 2.5) 1 screw (M1.4 x 3) 4 battery case 3 Remove the soldering. 5 three cabinet upper cushions 8 Remove solder 6 harnesses from the seven points. 7 Remove soldering from the five points.
  • Page 33 BM-21/23 1-5. MECHANISM DECK (MB-23-101) 3 two screws (M1.4 × 3.0) 1 Remove the soldering. lock plate assembly 2 Set the holder panel assembly to eject. shaft-A 4 mechanism deck note : When attaching the mechanism deck, (MB-23-101) set the mechanism deck to stop and adjust the position of shaft-A and part A of the lock plate assembly.

  • Page 34: Section 2 Mechanical Adjustments

    BM-21/23 SECTION 2 SECTION 3 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS PRECAUTION PRECAUTION 1. Clean the following parts with a denatured-alcohol-moistened 1. Power supply voltage : 3V swab : playback head rubber belts Test Tape capstan idlers Type Signal Used for pinch roller 2.
  • Page 35 BM-21/23 Tape Speed 2.4cm/s Adjustment Switch position TAPE SPEED Switch : 2.4 cm Procedure: frequency test counter WS-48A (3 kHz, 0 dB) 18 Ω J102 1. Play back WS-48A (tape center portion) in FWD mode. Adjust the RV602 so that the frequency counter reads 1,490±...

  • Page 36: Section 4 Diagrams

    BM-21/23 SECTION 4 DIAGRAMS • Note for Printed Wiring Boards and Schematic Diagrams Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. (p: pF) •...

  • Page 37: Block Diagram - Audio Section

    BM-21/23 4-1. BLOCK DIAGRAM – AUDIO SECTION – IC102 S501 MIC901 POWER AMP VR101 CUE / REVIEW Q103 VOLUME IN(-) OUT(+) S103 J102 MIC SENS Q104, Q106 Q102, Q107 OUT(-) SHUTDOWN CONF DICT MUTE MUTE CONTROL J101 PLUG IN POWER...

  • Page 38: Printed Wiring Boards

    BM-21/23 4-2. PRINTED WIRING BOARDS • :Uses unleaded solder. J102 J101 VR101 VOLUME PLUG IN POWER MIC901 FB902 S503 E-INDEX R106 HRP901-1 AUDIO LCD701 HEAD (LIQUID CRYSTAL DICT DISPLAY) IC502 S501 IC504 HE901 S103 CUE/REVIEW ERASE S402 MIC SENS HEAD...

  • Page 39: Schematic Diagram - Audio Board

    BM-21/23 4-3. SCHEMATIC DIAGRAM – AUDIO BOARD (1/4) – JR106 R103 MIC901 S103 R101 1.8k C103 TP21 C101 R102 SUPPLEMENT-2 5.6k Page 17 C105 R115 0.47 R105 TP27 J101 C104 TP28 0.0056 C102 R116 JR108 C148 0.001 R113 HRP90 R112 C111 0.0047...
  • Page 40 BM-21/23 • See page 18 for IC Block Diagrams. 4-4. SCHEMATIC DIAGRAM – AUDIO BOARD (2/4) – S501 C125 R136 0.001 Q104 Q106 C116 2SB1218A-R-TX 2SB1218A-R-TX Q107 Q111 TP51 UN5214-TX UN5214-TX TP52 C113 0.22 R123 R122 2.2k 2.2k R158 R132 Q103 3.3k...
  • Page 41 BM-21/23 • See page 18 for IC Block Diagram. 4-5. SCHEMATIC DIAGRAM – AUDIO BOARD (3/4) – SUPPLEMENT-2 SUPPLEMENT-2 Page 13 Page 14 S502 S401 JR205 R156 R153 R164 R154 R167 2.7k Q163 R163 2SD1819A-R-TX 270k C162 C161 R162 R157...
  • Page 42 BM-21/23 • See page 18 for IC Block Diagram. 4-6. SCHEMATIC DIAGRAM – AUDIO BOARD (4/4) – SUPPLEMENT-2 Page 14 JR110 JR105 SUPPLEMENT-2 Page 13 330k TP61 0.0033 3.3k 2SB1218A-R-TX 3.3k 100k Q522 100k JR202 JR201 0.0033 0.0033 3.3k UN5114-TX...

  • Page 43: Schematic Diagram - Lcd Board

    BM-21/23 • See page 10 for Waveform. • See page 19 for IC Pin Function Description. 4-7. SCHEMATIC DIAGRAM – LCD BOARD – S701 LCD701 R702 R701 470k 470k Q701 2SD1819A-R-TX Q712 Q713 UN5210-TX R722 UN5210-TX R703 R723 100k D702...
  • Page 44 BM-21/23 • IC Block Diagrams — AUDIO Board — IC102, IC103 MM3111AWLE IC601 LB1979VS-TLM-E SHUTDOWN BIAS BYPASS SPEED CONTROL STARTING OSCILLATING REFERENCE VOLTAGE DETECT CIRCUIT WAVEFORM DETECT COMMUTATION STARTING LOGIC SPEED CURRENT IC502 MM1210-XFF DETECT DETECT POWER SOFT SWITCH SUPPLY...
  • Page 45 BM-21/23 • IC Pin Function Description LCD BOARD IC701 SYSTEM CONTROLLER (BU2456-24) Pin No. Pin Name Description Reset terminal — GND terminal 1. When POWER IN becomes level “L”, UP counter, BATT, or LTR is displayed according to PHOTO IN change.

  • Page 46: Section 5 Exploded Views

    BM-21/23 SECTION 5 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • The mechanical parts with no reference The components identified by mark 0 or may have some difference from the original number in the exploded views are not supplied.

  • Page 47: Chassis Section

    BM-21/23 5-2. CHASSIS SECTION LCD701 mechanism deck section-1 (MB-23-101) MIC901 not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-831-441-11 CUSHION, CABINET UPPER 10X7X0.5 X-3367-814-1 PLATE, LOCK ASSY 3-345-648-81 SCREW (M1.4X3) 3-703-502-01 SCREW X-3367-813-1 CABINET (FRONT) ASSY 3-375-114-61 SCREW 3-704-197-33 SCREW (M1.4X3.0), LOCKING...
  • Page 48 BM-21/23 5-3. MECHANISM DECK SECTION-1 (MB-23-101) HRP901 HE901 not supplied mechanism deck section-2 (MB-23MK2-101) supplied M901 supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-375-135-02 SCREW (1.4), SPECIAL 3-701-437-51 WASHER 3-376-177-02 SCREW (M1.4X3.8) 3-371-882-01 SPRING (AZIMUTH), COMPRESSION...
  • Page 49 BM-21/23 5-4. MECHANISM DECK SECTION-2 (MB-23-101) not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-315-384-11 WASHER, STOPPER X-3367-818-1 TABLE ASSY, FELT 3-321-483-11 RING, RETAINING 3-910-004-01 SPRING, TENSION 3-910-006-01 SPRING, TORSION X-3363-568-1 LEVER ASSY, IDLER...

  • Page 50: Section 6 Electrical Parts List

    BM-21/23 SECTION 6 AUDIO ELECTRICAL PARTS LIST NOTE: • COILS uH: µH • Due to standardization, replacements in the When indicating parts by reference number, parts list may be different from the parts • RESISTORS please include the board name.
  • Page 51 BM-21/23 AUDIO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C602 1-104-847-11 TANTAL. CHIP 22uF JR203 1-216-864-11 SHORT CHIP C603 1-104-847-11 TANTAL. CHIP 22uF JR204 1-216-296-11 SHORT CHIP C606 1-164-346-11 CERAMIC CHIP JR205 1-216-864-11 SHORT CHIP...
  • Page 52 BM-21/23 AUDIO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q605 8-729-420-50 TRANSISTOR UN5215-(TX) R141 1-216-852-11 METAL CHIP 390K 1/10W Q606 8-729-402-96 TRANSISTOR UN5114-TX R142 1-216-841-11 METAL CHIP 1/10W Q607 8-729-426-36 TRANSISTOR XP1215-TXE Q608 8-729-420-50 TRANSISTOR...
  • Page 53 BM-21/23 AUDIO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R535 1-216-829-11 METAL CHIP 4.7K 1/10W S601 1-570-087-11 SWITCH, SLIDE (FAST PB >) R536 1-216-840-11 METAL CHIP 1/10W R537 1-216-845-11 METAL CHIP 100K 1/10W S602 1-571-277-31 SWITCH, SLIDE (FF)

  • Page 54: Manual, Instruction

    BM-21/23 Ref. No. Part No. Description Remark < RESISTOR > R701 1-216-853-11 METAL CHIP 470K 1/10W R702 1-216-853-11 METAL CHIP 470K 1/10W R703 1-216-845-11 METAL CHIP 100K 1/10W R704 1-216-845-11 METAL CHIP 100K 1/10W R705 1-216-847-11 METAL CHIP 150K 1/10W...
  • Page 55 BM-21/23 MEMO...

  • Page 56: Revision History

    BM-21/23 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 1994.02...

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