Sony M-740V Service Manual
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Sony M-740V Service Manual

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See also: Operating Instructions
SERVICE MANUAL
Ver 1.0 2001. 02
Sony Corporation
9-873-089-11
2001B1600-1
Audio Entertainment Group
© 2001.2
General Engineering Dept.
SPECIFICATIONS
Tape
(normal position type)
Recording system
2-track 1-channel monaural
Speaker
7
Approx. 3.6 cm (1
⁄
in.) dia.
16
Tape speed
15
15
2.4 cm/s (
⁄
ips), 1.2 cm/s (
⁄
16
32
Frequency range
300 - 4,000 Hz (with TAPE SPEED switch at 2.4 cm/s)
Input
Microphone input jack (minijack/PLUG IN POWER)
sensitivity 0.22 mV for 3 kilohms or lower impedance microphone
Output
Earphone jack (minijack) for 8 - 300 ohms earphone
Power output (at 10% harmonic distortion)
250 mW
Power requirements
3 V DC batteries R6 (size AA) × 2/External DC 3V power sources
Dimensions (w/h/d)
Approx. 62.2 × 120.5 × 25.5 mm (2
parts and controls
Mass
Approx. 130 g (4.6 oz)
Supplied accessories
Microcassette tape MC-30 (1) (European model only)
Batteries R6P (SR) (2) (European model only)
Carrying pouch (1) (M-830V and European model of M-740V only)
Design and specifications are subject to change without notice.
M-740V
East European Model
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
ips)
× 4
× 1
1
3
1
⁄
⁄
⁄
in.) incl. projecting
2
4
16
MICROCASSETTE
E Model
Chinese Model
M-730V
MZ-730V-99
TM
-CORDER

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Summary of Contents for Sony M-740V

  • Page 1 Approx. 130 g (4.6 oz) Supplied accessories Microcassette tape MC-30 (1) (European model only) Batteries R6P (SR) (2) (European model only) Carrying pouch (1) (M-830V and European model of M-740V only) Design and specifications are subject to change without notice. MICROCASSETTE -CORDER...

  • Page 2: Table Of Contents

    M-740V TABLE OF CONTENTS 1. GENERAL ..............2. DISASSEMBLY 2-1. Lid Assy, Cassette ............4 2-2. Lid, Battery Case ............4 2-3. Cabinet (Rear) Assy ............5 2-4. Speaker Assy, Microphone ..........5 2-5. Main Board ..............6 2-6. Mechanism Deck ............6 2-7.

  • Page 3: General

    SECTION 1 GENERAL This section is extracted from instruction manual. MIC (PLUG IN POWER) REC lamp (M-830V) Microphone Indicador REC (M-830V) Micrófono REC/BATT lamp (M-740V) Indicador REC/BATT (M-740V) > PAUSE CUE/ REVIEW FAST PB TAPE SPEED TAPE COUNTER CUE MARKER DIR.

  • Page 4: Disassembly

    M-740V SECTION 2 DISASSEMBLY • The equipment can be removed using the following procedure. Mechanism Head, ceramic Lid assy, cassette Cabinet (rear) Speaker, Microphone Main board deck assy (MIC901) (HRPE901,902) Lid, battery case LED unit Note : Follow the disassembly procedure in the numerical order given.

  • Page 5: Cabinet (Rear) Assy

    M-740V 2-3. CABINET (REAR) ASSY Note : When installing, fit the knobs and switches. 2 Four screws (B1.7 × 16) 1 Screw (B1.7 × 5) 5 Cabinet 3 Claw (rear) assy Knob (PAUSE) Knob (FR) 4 Claws Switch (PAUSE) Switch (TAPE SPEED) 2-4.

  • Page 6: Main Board

    M-740V 2-5. MAIN BOARD 4 Two screws 6 Main board 1 Unsolder 8 places. 3 Unsolder 4 places. 2 Unsolder 6 places. 2-6. MECHANISM DECK 4 Mechanism deck Button (REC) Button (PLAY) Button (EJECT/STOP)

  • Page 7: Led Unit

    M-740V 2-7. LED UNIT Blacket (LED) 1 Three screws (1.7 × 2.3) tapping LED unit Claw 2-8. HEAD, CERAMIC (HRPE901, 902) 2 Arm (pinch roller) assy 3 M1.4, special head 4 M1.4, special head 1 Claw 5 Head, ceramic (HRPE901, 902)

  • Page 8: Mechanical Adjustments

    M-740V SECTION 3 SECTION 4 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS PRECAUTION Test Tape 1. Clean the following parts with a denatured-alcohol-moistened Tape Speed swab : Type Signal Used for (cm/s) record/playback/erase head pinch roller S-2-A030A 3 kHz, – 20 dB Head Azimuth Adjustment...
  • Page 9 M-740V Tape Speed Adjustment Adjustment Location : First remove the plate, blind. Setting: VOL control : mechanical mid Remove the VOR switch : OFF plate, blind. Procedure: • Reform 2.4 cm/s speed adjustment before 1.2 cm/s speed adjustment mode : playback...

  • Page 10: Diagrams

    M-740V SECTION 5 DIAGRAMS • IC Block Diagrams IC101 LA4168ML-TE-L PAUSE 2.2k Vref R, F SPEED POWER 300k IC601 LB1877V-TLM 14 13 REF V BIAS – LOCKING SPEED PROTECT STARTUP WAVEFORM DRIVER DIR LOGIC STARTUP CURRENT 4 5 6...

  • Page 11: Block Diagram

    M-740V 5-1. BLOCK DIAGRAM REC/PB AMP PRE NF NF CONTROL IC101 (1/2) Q103, 116 RV101 J101 MIC IN S101 (3/4) PRE OUT POWER AMP (PLUG IN POWER) (REC/PB) ALC CONTROL IC101 (2/2) Q101 PWR IN PWR OUT2 J102 EQ IN...

  • Page 12: Printed Wiring Board

    M-740V 5-2. PRINTED WIRING BOARD IC601 • Semiconductor Location IC101 Ref. No. Location D101 IC101 IC601 Q101 Q102 Q103 Q104 Q105 Q106 Q107 Q108 G-11 Q109 Q111 Q112 Q116 Q117 F-11 Q118 Q119 Q120 F-11 Q603 D-11 Note: • X : parts extracted from the component side.

  • Page 13: Schematic Diagram

    M-740V 5-3. SCHEMATIC DIAGRAM • Refer to page 10 for IC Block Diagrams. Note: • All capacitors are in µF unless otherwise noted. pF: µµF • Voltage is dc with respect to ground under no-signal 50 WV or less are not indicated except for electrolytics condition.

  • Page 14: Exploded Views

    M-740V SECTION 6 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • -XX and -X mean standardized parts, so number in the exploded views are not supplied. they may have some difference from the • Items marked “*” are not stocked since original one.
  • Page 15 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-3052-320-A LID ASSY, CASSETTE 3-031-660-01 KNOB (FR) X-3380-121-2 CABINET (FRONT) SUB ASSY 3-035-255-11 SCREW (1.7X16) 3-031-649-01 KNOB (RV) 3-358-363-81 PLATE, BLIND 3-010-503-01 SPRING (B), BATTERY COIL 3-318-203-72 SCREW (B1.7X5), TAPPING 3-669-481-07 PIN (DIA.

  • Page 16: Mechanism Deck Section (1)

    M-740V 6-2. MECHANISM DECK SECTION (1) (MZ-730V-99) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-331-007-21 WASHER 3-321-813-71 RING, RETAINING 3-350-989-01 WASHER 3-028-928-01 LEVER (EJECT) 3-028-961-01 SPRING (BUTTON), COMPRESSION 3-028-964-01 SPRING (SLIDER), TORSION 3-046-281-01 LEVER (POWER SW)

  • Page 17: Mechanism Deck Section (2)

    M-740V 6-3. MECHANISM DECK SECTION (2) (MZ-730V-99) HRPE901 M901 HRPE902 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-704-197-01 SCREW (M1.4), SPECIAL HEAD 3-028-922-01 BRACKET (N), HEAD 3-703-816-73 SCREW (M1.4), SPECIAL HEAD X-3376-234-1 BRACKET (R) ASSY, HEAD...

  • Page 18: Electrical Parts List

    M-740V SECTION 7 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • CAPACITORS: • SEMICONDUCTORS uF: µF In each case, u: µ, for example: parts list may be different from the parts uA...: µA... , uPA... , µPA... , specified in the diagrams or the components •...
  • Page 19 M-740V MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks Q104 8-729-230-63 TRANSISTOR 2SC4116-YG R147 1-216-069-00 METAL CHIP 6.8K 1/10W Q105 8-729-230-63 TRANSISTOR 2SC4116-YG R148 1-216-089-11 RES-CHIP 1/10W Q106 8-729-420-44 TRANSISTOR UN5210 R149 1-216-073-00 METAL CHIP...
  • Page 20 M-740V Ref. No. Part No. Description Remarks ACCESSORIES & PACKING MATERIALS ******************************** 3-035-588-01 POUCH, CARRYING (EastEuropean) 3-229-699-31 MANUAL, INSTRUCTION (ENGLISH/SPANISH/ITALIAN/PORTUGUESE)(E) 3-229-699-51 MANUAL, INSTRUCTION (ENGLISH/CHINESE/HUNGARIAN/RUSSIAN) (Chinese/EastEuropean) 3-229-699-61 MANUAL, INSTRUCTION (FRENCH/SLOVAK/POLISH/CZECH)(EastEuropean) 3-229-699-71 MANUAL, INSTRUCTION (ENGLISH/CHINESE)(E)
  • Page 21 M-740V 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...

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