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Sony HST-471 Service Manual
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Sony HST-471 Service Manual

Cassette deck receiver
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SERVICE MANUAL
This set is the tunerdeck
and amplifier section
in SEN-R4720/R5750.
Manufactured under license from Dolby
Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol a are
trademarks of Dolby Laboratories Licensing
Corporation.
MICROFILM
HST-471
Tape deck
Model Name Using Similar Mechanism
Section
Tape Transport Mechanism Type

SPECIFICATIONS

CASSETTE DECK RECEIVER
AEP Model
UK Model
E Model
Australian Model
HCD-GR8/RX90
TCM-220WR2
— Continued on next page —

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  • Page 1 HST-471 SERVICE MANUAL AEP Model UK Model E Model Australian Model This set is the tunerdeck and amplifier section in SEN-R4720/R5750. Manufactured under license from Dolby Tape deck Model Name Using Similar Mechanism HCD-GR8/RX90 Laboratories Licensing Corporation. Section Tape Transport Mechanism Type TCM-220WR2 “DOLBY”...

  • Page 2: Table Of Contents

    COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON 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: Tuner/Amp Section

    SECTION 1 GENERAL • TUNER/AMP SECTION 10 KEY SURROUND MODE (DOLBY/HALL/SIMULATED) MEMORY !º CONTROL MODE (–/+) TUNING (–/+) !¡ CONTROL MODE BAND (TONE/CENTER/REAR/WOOFER) MEMORY SCAN !™ MASTER VOLUME STEREO/MONO !£ WOOFER ON/OFF POWER !¢ VIDEO 1/VIDEO 2/TAPE/CD/TUNER/PHONO CENTER MODE !∞ SOUND FIELD (1 ROCK/2 POPS/3 CLASSIC/4 MOVIE/5 GAME) •...

  • Page 4: Mechanical Adjustments

    SECTION 2 SECTION 3 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS PRECAUTION DECK SECTION 0 dB=0.775V Clean the following parts with a denatured-alcohol-moistened swab: Demagnetize the record/playback head with a head record/playback head pinch roller demagnetizer. (Do not bring the head demagnetizer close to erase head rubber belts the erase head.)
  • Page 5 Turn the adjustment screw and check output peaks. If the peaks Tape Speed Adjustment DECK A do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak. Note: Start the Tape Speed adjustment as below after setting to the test mode.
  • Page 6 Adjustment Location: main board Record bias Current Adjustment DECK B Procedure: [MAIN BOARD] (Component Side) Mode: Record CD IN connector (L: L-CH) (R: R-CH)  1) 315 Hz  50 mV (–23.8 dB) 2) 10 kHz  AF OSC blank tape J301 CS-123 600 Ω...
  • Page 7 — 7 —...

  • Page 8: Circuit Boards Location

    SECTION 4 DIAGRAMS 4-1. CIRCUIT BOARDS LOCATION AC BOARD DISPLAY BOARD TEN KEY BOARD PRIMARY BOARD TUNER UNIT SUB HP BOARD HP BAORD SECONDARY BOARD MAIN BOARD DECK A BOARD LEAF SWITCH BOARD AUDIO BOARD POWER BOARD WOOFER BOARD DECK B BOARD —...

  • Page 9: Block Diagram

    HST-471 4-2. BLOCK DIAGRAM • Signal path : TUNER/AUDIO : PB (DECK A) : PB (DECK B) : REC (DECK B) : CD : VIDEO-1 AUDIO : VIDEO-2 AUDIO — 9 — — 10 — — 11 —...

  • Page 18: Ic Block Diagrams

    HST-471 4-11.IC BLOCK DIAGRAMS IC303 LA2786 IC302 LC7822 IC310 LC7824 4-12. IC PIN FUNCTION • IC701 SYSTEM CONTROL (µPD780204GF-024-3A) BPF1 NOISE NOISE BPF2 FILTER Pin No. Description Pin Name NOISE GENERATOR DATA — BALANCE ENABLE VREF V REF CONTROL ST MUTE TUNER MUTE, H: ON.
  • Page 19 Pin No. Pin Name Description POWER - RY POWER RELAY, H: ON. H. P SENSE HEAD PHONE input, H: ON. TC B PLAY TC B deck play switch, H: PLAY. TC A PLAY TC A deck play switch, H: PLAY. TA A HALF TC A deck, half input.

  • Page 20: Main Section

    SECTION 5 REPAIR PARTS LIST Note: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number The components identified by mark ! or have some differences from the original one. in the exploded views are not supplied. dotted line with mark ! are critical for safety.

  • Page 21: Front Panel Section

    A-4384-805-A PANEL ASSY, FRONT 4-980-107-01 KNOB (VOL) 4-990-050-01 BUTTON (TEN KEY) * 72 1-665-251-11 DECK A BOARD 4-990-052-01 BUTTON (FUNCTION) 3-008-600-11 EMBLEM (5-AR), SONY * 60 1-665-247-11 HP BOARD * 74 4-982-462-01 HOUSE, LED * 61 1-665-248-11 SUB HP BOARD 4-990-060-01 WINDOW (FUNCTION) 4-951-620-01 SCREW (2.6X8), +BVTP...

  • Page 22: Tape Mechanism Deck Section

    5-3. TAPE MECHANISM DECK SECTION-1 (TCM-220WR2) • A : HEAD FLEXIBLE board (DECK A) • B : HEAD FLEXIBLE board (DECK B) Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-908-560-01 SPRING, AZIMUTH ADJUSTMENT X-3371-305-1 REEL (T) ASSY 3-919-684-01 SCREW, AZIMUTH ADJUSTMENT 3-669-465-01 WASHER (1.5), STOPPER X-3373-113-1 SLIDER (HEAD) ASSY...
  • Page 23 5-4. TAPE MECHANISM DECK SECTION-2 (TCM-220WR2) • C : MOTOR board • C not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-908-597-01 CAM (A) X-3370-171-1 FLYWHEEL (BR) ASSY 3-908-608-11 SCREW, STEP 3-908-600-01 LEVER (REV-B) X-3372-930-1 ARM (A) ASSY, FR * 416 1-650-669-11 LEAF SWITCH BOARD...

  • Page 24: Electrical Parts List

    SECTION 6 AUDIO ELECTRICAL PARTS LIST Note: • Due to standardization, replacements in the • RESISTORS When indicating parts by reference number, parts list may be different from the parts All resistors are in ohms. please include the board naame. specified in the diagrams or the components METAL: metal-film resistor used on the set.
  • Page 25 AUDIO DECK A DECK B Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < CONNECTOR > < VARIABLE RESISTOR > CN601 1-695-382-31 PIN, CONNECTOR (PC BOARD) 21P RV301 1-238-598-11 RES, ADJ, CARBON 2.2K CN602 1-564-718-11 PIN, CONNECTOR (SMALL TYPE) 2P RV311 1-238-598-11 RES, ADJ, CARBON 2.2K * CN651...
  • Page 26 DECK B DISPLAY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R970 1-249-417-11 CARBON 1/4W F < CONNECTOR > R971 1-249-419-11 CARBON 1.5K 1/4W F R972 1-249-421-11 CARBON 2.2K 1/4W F * CN701 1-565-480-11 CONNECTOR, BOARD TO BOARD 4P R973 1-249-422-11 CARBON 2.7K...
  • Page 27 DISPLAY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks Q720 8-729-116-17 TRANSISTOR BA1L3M-TP R775 1-249-427-11 CARBON 6.8K 1/4W F Q721 8-729-116-17 TRANSISTOR BA1L3M-TP R776 1-249-410-11 CARBON 1/4W F Q722 8-729-116-17 TRANSISTOR BA1L3M-TP R777 1-249-411-11 CARBON 1/4W Q723 8-729-116-17 TRANSISTOR BA1L3M-TP R778...
  • Page 28 DISPLAY HP (SUB HP) LEAF SWITCH MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R845 1-247-807-31 CARBON 1/4W 1-665-247-11 HP BOARD R846 1-247-807-31 CARBON 1/4W ******** R847 1-247-807-31 CARBON 1/4W R848 1-247-807-31 CARBON 1/4W 1-665-248-11 SUB HP BOARD R849 1-247-807-31 CARBON 1/4W...
  • Page 29 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C111 1-130-473-00 MYLAR 0.0015uF 5% C330 1-126-963-11 ELECT 4.7uF C112 1-126-960-11 ELECT C331 1-126-959-11 ELECT 0.47uF C113 1-126-962-11 ELECT 3.3uF C332 1-126-963-11 ELECT 4.7uF C114 1-126-964-11 ELECT 10uF C333 1-126-959-11 ELECT...
  • Page 30 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C548 1-162-306-11 CERAMIC 0.01uF D964 8-719-987-63 DIODE 1N4148M C601 1-126-964-11 ELECT 10uF D965 8-719-987-63 DIODE 1N4148M C603 1-126-964-11 ELECT 10uF C604 1-126-964-11 ELECT 10uF < TERMINAL > C605 1-136-153-00 FILM 0.01uF...
  • Page 31 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < RESISTOR > R225 1-247-863-91 CARBON 1/4W R226 1-247-840-00 CARBON 2.4K 1/4W 1-247-807-31 CARBON 1/4W R227 1-249-417-11 CARBON 1/4W F 1-247-807-31 CARBON 1/4W R228 1-249-428-11 CARBON 8.2K 1/4W F R101 1-249-417-11 CARBON...
  • Page 32 MAIN POWER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R604 1-249-422-11 CARBON 2.7K 1/4W F < TEST PIN > R605 1-249-411-11 CARBON 1/4W R606 1-249-411-11 CARBON 1/4W TP511 1-691-574-31 PIN, CONNECTOR (PC BOARD) 3P R607 1-249-417-11 CARBON 1/4W F TP521...
  • Page 33 POWER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C962 1-130-781-00 FILM 0.22uF 100V Q271 8-729-119-76 TRANSISTOR 2SA1175-HFE C963 1-136-169-00 FILM 0.22uF Q272 8-729-141-30 TRANSISTOR 2SC3623A-LK C964 1-136-169-00 FILM 0.22uF Q273 8-749-010-25 IC MN2488-OPY-M C971 1-117-782-11 ELECT 6800uF Q274 8-749-010-26 IC MP1620-OPY-M...
  • Page 34 POWER PRIMARY SECONDARY TEN KEY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R284 1-249-438-11 CARBON 1/4W R963 1-249-381-11 CARBON 1 5% 1/4W F (E,SP) R285 1-249-389-11 CARBON 1/4W F R964 1-249-381-11 CARBON 1 5% 1/4W F (E,SP) R286 1-247-754-81 CARBON 1.5K...
  • Page 35 TEN KEY WOOFER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks S736 1-554-303-21 SWITCH, TACTILE (5) ACCESSORIES & PACKING MATERIALS S737 1-554-303-21 SWITCH, TACTILE (4) ******************************* S738 1-554-303-21 SWITCH, TACTILE (3) S739 1-554-303-21 SWITCH, TACTILE (2) 1-475-103-11 REMOTE COMMANDER (RM-U575) S740 1-554-303-21 SWITCH, TACTILE (1)
  • Page 36 HST-471 Sony Corporation 97F1676-1 Printed in Japan © 1997.6 9-960-973-11 Home A&V Products Company Published by General Engineering Dept. — 56 — (Shibaura)

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