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Sony TC-WE425 Service Manual
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Sony TC-WE425 Service Manual

Stereo cassette deck
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SERVICE MANUAL
Dolby noise reduction extension manufactured under license
from Dolby Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen. "DOLBY", the double-D
symbol a and "HX PRO" are trademarks of Dolby Laboratories
Licensing Corporation.
System
Recording system
4-track 2-channel stereo
Fast-winding time (approx.)
100 sec. (with Sony C-60 cassette)
Bias
AC bias
Signal-to-noise ratio (at peak level and weighted with Dolby NR off)
Type I tape, Sony Type I (NORMAL): 55 dB
Type II tape, Sony Type II (HIGH): 57 dB
Type IV tape, Sony Type IV (METAL): 58 dB
S/N ratio improvement (approximate values)
With Dolby B NR on: 5 dB at 1 kHz, 10 dB at 5 kHz
With Dolby C NR on: 15 dB at 500 Hz, 20 dB at 1 kHz
Harmonic distortion
0.4% (with Type I tape, Sony Type I (NORMAL):
160 nWb/m 315 Hz, 3rd H.D.)
1.8% (with Type IV tape, Sony Type IV (METAL):
250 nWb/m 315 Hz, 3rd H.D.)
MICROFILM
Photo: TC-WE425
SPECIFICATIONS
Frequency response (Dolby NR off)
Tape type
Type I tape, Sony Type I
(NORMAL)
Type II tape, Sony Type II
(HIGH)
Type IV tape, Sony Type IV
(METAL)
Wow and flutter
± 0.15% W. Peak (IEC)
0.1% W. RMS (NAB)
± 0.2% W. Peak (DIN)
– 1 –
TC-WE425/WE525/
Canadian Model
Australian Model
Chinese Model
Model Name Using Similar
Mechanism
Tape Transport
DECK A
Mechanism Type DECK B
30-16,000 Hz (±3 dB, IEC),
20-17,000 Hz (±6 dB)
30-17,000 Hz (±3 dB, IEC),
20-18,000 Hz (±6 dB)
30-19,000 Hz (±3 dB, IEC),
20-20,000 Hz (±6 dB),
– Continued on next page –
STEREO CASSETTE DECK
WR681
US Model
TC-WE425/WR681
TC-WE425
AEP Model
TC-WE525/WR681
UK Model
TC-WE525
E Model
TC-WE425/WR681
TC-WE425
NEW
TCM-230ASR1
TCM-230ASR2

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Summary of Contents for Sony TC-WE425

  • Page 1 Signal-to-noise ratio (at peak level and weighted with Dolby NR off) Type IV tape, Sony Type IV 30-19,000 Hz (±3 dB, IEC), Type I tape, Sony Type I (NORMAL): 55 dB (METAL) 20-20,000 Hz (±6 dB), Type II tape, Sony Type II (HIGH): 57 dB...
  • Page 2 CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU IN SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: Table Of Contents

    TC-WE525 : UK model 2-9. Head Relay (PB) Board (Deck A), 3-021-244-4π TC-WE425 : AUS model Head Relay (REC) Board (Deck B) ........9 3-021-244-5π TC-WE425 : SP, MY model 3. MECHANICAL ADJUSTMENTS 3-021-244-6π TC-WE425 : CH model ....... 10 3-021-245-0π...

  • Page 4: General

    9. Cassette holder (Deck B) HIGH/NORMAL, DUBBING AnB button 10. Tape operation buttons (Deck A) 16. PHONES jack (TC-WE425/WE525) 0 (REW) button 17. SYNCHRO button and indicator (TC-WE425/WE525) ) (FF) button 18. ARL button p CLEAR (Stop) button 19. FADER button ª...

  • Page 5: Disassembly

    SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. CASE 4 case 3 screws (case 3 TP2) 1 BVTP 3x8 2 screws (case 3 TP2) 2-2. FRONT PANEL ASSY 2 CN621 3 CN601 4 CN611 5 CN411 1 CN311 6 CN591...

  • Page 6: Cassette Lid Assy (Deck A/B)

    2-3. CASSETTE LID ASSY (DECK A/B) 1 Push the EJECT button. 3 cassette lid assy 2 claws 2-4. MECHANISM DECK ASSY (DECK A/B) 3 mechanism deck assy 1 BVTP 2.6x8 2 BVTP 2.6x8 – 6 –...

  • Page 7: Leaf Sw (A) Board (Deck A), Leaf Sw (B) Board (Deck B)

    2-5. LEAF SW (A) BOARD (DECK A), LEAF SW (B) BOARD (DECK B) 1 PS 2.6x6 5 BVTT 2x4 2 capstan motor assy 4 BVTT 2x4 3 wires 7 LEAF SW (A) board (Deck A) LEAF SW (B) board 8 belt (capstan) (Deck B) When installing, pull the belt (capstan)

  • Page 8: Pinch Lever (Fwd)/(Rev) Assy (Deck A/B)

    2-6. PINCH LEVER (FWD) / (REV) ASSY (DECK A/B) 4 pinch lever (FWD) assy 2 pinch lever (REV) assy 1 claw 3 claw 2-7. FLYWHEEL (FWD) / (REV) ASSY (DECK A/B) 1 belt (FR2) 3 flywheel (FWD) assy 6 flywheel (REV) assy 4 washer 7 washer 2 stopper washer...

  • Page 9: Mechanical Block Assy (Deck A/B)

    2-8. MECHANICAL BLOCK ASSY (DECK A/B) 2 BVTT 2x3 3 BVTT 2x3 4 mechanical block assy 1 torsion spring 5 reverse slider 2-9. HEAD RELAY (PB) BOARD (DECK A), HEAD RELAY (REC) BOARD (DECK B) 3 tension spring (HEAD) 4 head deck assy 2 HEAD RELAY (PB) board (Deck A) HEAD RELAY (REC) board...

  • Page 10: Mechanical Adjustments

    SECTION 3 SECTION 4 ELECTRICAL ADJUSTMENTS MECHANICAL ADJUSTMENTS PRECAUTION PRECAUTION 1. Clean the following parts with a denatured alcohol-moistened 1. The adjustment should be performed in the publication. swab : (Be sure to male playback adjustment at first.) record/playback/erase head pinch roller 2.
  • Page 11 Record/Playback Head Azimuth Adjustment Tape Speed Adjustment DECK A DECK B DECK A DECK B Procedure: Procedure: –Forward Playback Mode– 1. Forward Playback Mode test tape test tape WS-48B P-4-A100 (3 kHz, 0 dB) level meter frequency counter 47 k Ω (10 kHz, –10 dB) 47 k Ω...
  • Page 12 Bias Consumption Current Adjustment DECK B Record Level Adjustment DECK B Setting: This adjustment should be performed when replacing the head assy REC LEVEL control : standard record position (See page 10.) or the bias oscillator transformer (T131, T231). Procedure: Procedure: 1.
  • Page 13 Adjustment Location: main board PLAYBACK LEVEL ADJ (DECK A) RV111 RV211 –main board (component side)– RECORD LEVEL ADJ (DECK B) RV161 RV261 RV318 TAPE SPEED ADJ (PITCH CONTROL) (TC-WE525 only) RV121 RV221 PLAYBACK LEVEL ADJ (DECK B) RV317 (NORMAL) TAPE SPEED ADJ (DECK A) RV316 (HIGH) RV417 (NORMAL)

  • Page 14: Diagrams

    SECTION 5 DIAGRAMS 5-1. IC PIN DESCRIPTION • IC801 CXP82220-051Q (SYSTEM CONTROLLER) Pin No. Pin Name Pin Description A-PLAY Play switch input (DECK A) POWER IN (CED) Power-in detection input — — Connected to ground. SIRCS Sircs signal input — —...
  • Page 15 Pin No. Pin Name Pin Description B-CAPM2 Capstan motor driver (DECK B) B-CAPM3 Capstan motor driver (DECK B) B-CAPM4 Capstan motor driver (DECK B) B-CAPM1 Capstan motor driver (DECK B) A-CAPM2 Capstan motor driver (DECK A) A-CAPM1 Capstan motor driver (DECK A) A-CAPM3 Capstan motor driver (DECK A) A-CAPM4...

  • Page 16: Circuit Boards Location

    (Except US, Canadian) HEAD RELAY (PB) board DISPLAY board RECVOL board LEAF SW (B) board H.P board (TC-WE425/WE525) HEAD RELAY (REC) board THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.)

  • Page 17: Printed Wiring Boards -Main Section

    TC-WE425/WE525/WR681 • Semiconductor Location Ref. No. Location 5-3. PRINTED WIRING BOARDS — MAIN SECTION — D159 D259 D306 D-11 D307 D-11 D318 D-11 D451 D581 D681 D701 B-10 D702 B-10 D703 A-10 D704 A-10 D705 B-10 D711 D712 D721 D731...

  • Page 18: Schematic Diagram -Main Section (1/3)

    TC-WE425/WE525/WR681 5-4. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — (Page 21) (Page (Page (Page 33) – 19 – – 20 –...

  • Page 19: Schematic Diagram -Main Section (2/3)

    TC-WE425/WE525/WR681 5-5. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) — (Page (Page 24) – 21 – – 22 –...

  • Page 20: Schematic Diagram -Main Section (3/3)

    TC-WE425/WE525/WR681 5-6. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — (Page 28) (Page 27) (Page 21) (Page (Page 27) (Page (Page – 23 – – 24 –...

  • Page 21: Printed Wiring Boards -Panel Section

    TC-WE425/WE525/WR681 5-7. PRINTED WIRING BOARDS — PANEL SECTION — (Page 18) (Page 18) (Page 18) (Page 18) (Page 18) – 25 – – 26 –...

  • Page 22: Schematic Diagram -Panel Section

    TC-WE425/WE525/WR681 5-8. SCHEMATIC DIAGRAM — PANEL SECTION — (Page 23) (Page 23) (Page 23) (Page 23) (Page 23) – 27 – – 28 –...

  • Page 23: Printed Wiring Boards -Power Section

    TC-WE425/WE525/WR681 5-9. PRINTED WIRING BOARDS — POWER SECTION — (Page 18) (Page 18) EXCEPT AUS VOLTAGE – 29 – – 30 –...

  • Page 24: Schematic Diagram -Power Section

    TC-WE425/WE525/WR681 5-10. SCHEMATIC DIAGRAM — POWER SECTION — EXCEPT AUS (Page 24) (Page 24) – 31 –...

  • Page 25: Printed Wiring Board -Deck A Section

    TC-WE425/WE525/WR681 5-11. PRINTED WIRING BOARD — DECK A SECTION — (Page 18) 5-12. SCHEMATIC DIAGRAM — DECK A SECTION — (Page – 32 –...

  • Page 26: Printed Wiring Board -Deck B Section

    TC-WE425/WE525/WR681 5-13. PRINTED WIRING BOARD — DECK B SECTION — (Page 17) 5-14. SCHEMATIC DIAGRAM — DECK B SECTION — (Page – 33 –...

  • Page 27: Exploded Views

    SECTION 6 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • -XX and -X mean standardized parts, so The components identified by number in the exploded views are not supplied. they may have some difference from the mark ! or dotted line with mark. •...

  • Page 28: Chassis Section

    6-2. CHASSIS SECTION US, CND AEP, SP, MY/ WR681 : AUS T901 WE425 : AUS not supplied not supplied WE425/ WE525 WE425/WE525 WR681 WR681 The components identified by Les composants identifiés par une mark ! or dotted line with mark. marque ! sont critiques pour la ! are critical for safety.

  • Page 29: Cassette Holder Section

    6-3. CASSETTE HOLDER SECTION TCM-230ASR1 TCM-230ASR2 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3374-866-1 LID (A) ASSY, CASSETTE 3-019-451-01 PLATE (R), FULCRUM X-3374-867-1 LID (B) ASSY, CASSETTE X-3375-107-1 HOLDER (L) ASSY, CASSETTE 3-931-427-31 BUTTON (EJECT) 3-019-454-01 SPRING (L), LOADING 3-022-410-01 DAMPER 3-019-453-01 LEVER (LOCK R)

  • Page 30: Front Panel Section

    1-668-800-11 POWER1 BOARD (EXCEPT US,CND) X-3375-108-1 PANEL ASSY, FRONT (WE525) 3-380-952-21 BUTTON (WE525) 3-021-239-01 KNOB (REC) 3-931-378-01 KNOB (F10) (WE525) 4-996-698-41 EMBLEM, SONY * 165 1-668-802-11 DIRECTION BOARD (EXCEPT US,CND) 4-977-593-01 RING (DIA. 50), ORNAMENTAL 1-773-391-11 WIRE (FLAT TYPE) (35 CORE)

  • Page 31: Tape Mechanism Section

    6-5. TAPE MECHANISM SECTION (DECK A : TCM-230ASR1) (DECK B : TCM-230ASR2) M1001 (DECK A) M1002 (DECK B) 209 211 HP1 (DECK A) HRPE1 (DECK B) Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-016-574-01 SPRING (HEAD), TENSION 3-016-575-01 SPRING, TORSION X-3374-156-3 PINCH LEVER (REV) ASSY X-3374-235-1 FLYWHEEL (REV) ASSY...

  • Page 32: Electrical Parts List

    DIRECTION SECTION 7 ELECTRICAL PARTS LIST DISPLAY H. P NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by the parts list may be different from the they are seldom required for routine service. mark ! or dotted line with mark.
  • Page 33 HEAD RELAY (PB) H. P HEAD RELAY (REC) LEAF SW (A) LEAF SW (B) MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < JACK > < RESISTOR > J991 1-568-519-41 JACK, LARGE TYPE (PHONES) R1002 1-249-409-11 CARBON 1/4W R1003...
  • Page 34 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C181 1-126-964-11 ELECT 10uF C581 1-104-665-11 ELECT 100uF C203 1-126-961-11 ELECT 2.2uF C591 1-126-935-11 ELECT 470uF C211 1-162-289-31 CERAMIC 390PF (WE425/WE525) C212 1-162-282-31 CERAMIC 100PF C661 1-137-446-11 FILM 0.18uF C213 1-137-372-11 FILM...
  • Page 35 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D702 8-719-024-99 DIODE 11ES2-NTA2B Q302 8-729-801-93 TRANSISTOR 2SD1387 D703 8-719-024-99 DIODE 11ES2-NTA2B Q303 8-729-029-66 TRANSISTOR DTC114ESA D704 8-719-024-99 DIODE 11ES2-NTA2B Q306 8-729-030-02 TRANSISTOR DTC144ESA (WE525) D705 8-719-024-99 DIODE 11ES2-NTA2B Q307 8-729-030-02 TRANSISTOR DTC144ESA D711...
  • Page 36 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark ! R133 1-212-857-00 FUSIBLE 1/4W F R283 1-249-429-11 CARBON 1/4W R134 1-249-435-11 CARBON 1/4W R284 1-249-417-11 CARBON 1/4W R135 1-249-429-11 CARBON 1/4W R291 1-249-433-11 CARBON 1/4W R151 1-247-843-11 CARBON 3.3K 1/4W...
  • Page 37 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R468 1-249-429-11 CARBON 1/4W R822 1-249-417-11 CARBON 1/4W R481 1-249-417-11 CARBON 1/4W R823 1-249-425-11 CARBON 4.7K 1/4W R482 1-249-429-11 CARBON 1/4W R825 1-247-876-11 CARBON 1/4W R551 1-249-417-11 CARBON 1/4W R826 1-247-876-11 CARBON...
  • Page 38 MAIN POWER POWER1 POWER2 RECVOL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < VIBRATOR > < RESISTOR > X841 1-579-175-11 VIBRATOR, CERAMIC (10MHz) R941 1-249-418-11 CARBON 1.2K 1/4W R942 1-249-420-11 CARBON 1.8K 1/4W ************************************************************* (WE425/WE525) 1-668-805-11 POWER BOARD R952 1-249-413-11 CARBON...
  • Page 39 TC-WE425/WE525/WR681 Ref. No. Part No. Description Remark ACCESSORIES & PACKING MATERIALS ******************************** 1-558-271-11 CORD, CONNECTION (AUDIO) 1-777-241-11 CORD, CONNECTION (CONTROL A1) (CND) 3-810-765-33 MANUAL, COMMONNESS INSTRUCTION (CONTROL A1) (ENGLISH) (WE425:US,AUS/WE525:UK) 3-810-765-43 MANUAL, COMMONNESS INSTRUCTION (CONTROL A1) (ENGLISH,FRENCH,GERMAN, SPANISH,DUTCH,SWEDISH,ITALIAN, PORTUGUESE,CHINESE) (WE425:CND,CH,SP,MY/WE525:AEP)

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