Sony HST-471 Bedienungsanleitung

HST-471

AEP Model

UK Model

E Model

Australian Model

SERVICE MANUAL

CASSETTE DECK RECEIVER

MICROFILM

Tape deck Model Name Using Similar Mechanism HCD-GR8/RX90

Section Tape Transport Mechanism Type TCM-220WR2

SPECIFICATIONS

Manufactured under license from Dolby

Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol aare

trademarks of Dolby Laboratories Licensing

Corporation.

— Continued on next page —

This set is the tunerdeck

and amplifier section

in SEN-R4720/R5750.

— 2 —

TABLE OF CONTENTS

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH

MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

MODEL IDENTFICATION

— Model Number Label —

AEP, UK : AC 220-230V ~ 50/60Hz 240W

Australian : AC 240V ~ 50Hz 240W

E, Singapore : AC 110-120, 220-240V selectable ~ 50/60Hz 240W

MODEL IDENTIFICATION

MODEL NO. HST-471

CASSETTE DECK RECEIVER

1. GENERAL

• Tuner/Amp Section ···································································· 3

• Deck Section ·············································································· 3

2. MECHANICAL ADJUSTMENTS ·························· 4

3. ELECTRICAL ADJUSTMENTS ···························· 4

4. DIAGRAMS

4-1. Circuit Boards Location ····················································· 8

4-2. Block Diagram ··································································· 9

4-3. Schematic Diagram — Deck Section — ·························· 12

4-4. Printed Wiring Board — Deck Section — ······················· 15

4-5. Printed Wiring Board — Main Section — ······················· 17

4-6. Schematic Diagram — Main Section — ·························· 19

4-7. Schematic Diagram — Display Section — ······················ 23

4-8. Printed Wiring Board — Display Section — ··················· 27

4-9. Printed Wiring Board — Power Section — ····················· 30

4-10. Schematic Diagram — Power Section — ························ 33

4-11. IC Block Diagrams ··························································· 36

4-12. IC Pin Function ································································ 38

5. REPAIR PARTS LIST

5-1. Main Section····································································· 40

5-2. Front Panel Section ·························································· 41

5-3. Tape Mechanism Deck Section-1

(TCM-220WR2) ······························································· 42

5-4. Tapa Mechanism Deck Section-2

(TCM-220WR2) ······························································· 43

6. ELECTRICAL PARTS LIST ··································· 44

— 3 —

SECTION 1

GENERAL

•TUNER/AMP SECTION

110 KEY

2MEMORY

3TUNING (–/+)

4BAND

5MEMORY SCAN

6STEREO/MONO

7POWER

8CENTER MODE

9SURROUND MODE (DOLBY/HALL/SIMULATED)

!º CONTROL MODE (–/+)

!¡ CONTROL MODE

(TONE/CENTER/REAR/WOOFER)

!™ MASTER VOLUME

!£ WOOFER ON/OFF

!¢ VIDEO 1/VIDEO 2/TAPE/CD/TUNER/PHONO

!∞ SOUND FIELD

(1 ROCK/2 POPS/3 CLASSIC/4 MOVIE/5 GAME)

• DECK SECTION

!§ 0(DECK A)

!¶ )(DECK A)

!• p(DECK A)

!ª ª(DECK A)

@º ·(DECK A)

@¡ DIRECTION (DECK B)

@™ DOLBY NR (DECK B)

@£ DUBBING SPEED (HIGH/NORMAL) (DECK B)

@¢ REC (PAUSE/REC MUTE/REC) (DECK B)

@∞ 0(DECK B)

@§ p(DECK B)

@¶ ª(DECK B)

@• ·(DECK B)

@ª )(DECK B)

— 4 —

SECTION 2

MECHANICAL ADJUSTMENTS SECTION 3

ELECTRICAL ADJUSTMENTS

PRECAUTION

1. Clean the following parts with a denatured-alcohol-moistened

swab:record/playback head pinch roller

erase head rubber belts

capstan idlers

2. Demagnetize the record/playback head with a head

demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

•Torque Measurement

•TapeTension Measurement

DECK SECTION 0 dB=0.775V

1. Demagnetize the record/playback head with a head

demagnetizer. (Do not bring the head demagnetizer close to

the erase head.)

2. Do not use a magnetized screwdriver for the adjustments.

3. After the adjustments, apply suitable locking compound to the

parts adjust.

4. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

5. The adjustments should be performed in the order given in this

servicemanual. (Asageneral rule,playback circuitadjustment

should be completed before performing recording circuit

adjustment.)

6. The adjustments should be performed for both L-CH and R-

ch.

7. Switchesand controlsshould beset asfollows unlessotherwise

specified.

8. Set to test mode. (Press key switch same time

SPECTRUM ANALYZER ENTER/NEXT and

EFFECT ON/OFF button.)

• Test Tape

Record/Playback Head Azimuth Adjustment

DECK A DECK B

Note : Perform this adjustments for both decks. Remove the covers

of cassette holders.

Procedure:

1. Mode: Playback (FWD)

Mode Torque Meter Meter Reading

Forward CQ-102C 36 to 61g•cm

(0.50 – 0.84 oz•inch)

Forward CQ-102C 2 to 6g•cm

Back Tension (0.026 – 0.082 oz•inch)

Reverse CQ-102RC 36 to 61g•cm

(0.50 – 0.84 oz•inch)

Reverse CQ-102RC 2 to 6g•cm

Back Tension (0.026 – 0.082 oz•inch)

FF, REW CQ-201B 61 to 143g•cm

(0.85 – 1.98 oz•inch)

Mode Tension Meter Meter Reading

Forward CQ-403A

more than 100 g (3.53 oz)

Reverse CQ-403R

more than 100 g (3.53 oz)

Tape Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

WS-48B 3 kHz, 0dB Tape Speed Adjustment

P-4-L300 315 Hz, 0dB Level Adjustment

set

rear panel

VIDEO1

AUDIO OUT connector

(L: L-CH)

(R: R-CH)

–

level meter

test tape

P-4-A100

(10 kHz, –10 dB)

— 5 —

2. Turn the adjustment screw and checkoutput peaks. If the peaks

do not match for L-CH and R-CH, turn the adjustment screw

so that outputs match within 1dB of peak.

3. Mode: Playback (FWD)

4. Repeat steps 1 to 3 in playback (REV) mode.

5. After the adjustments, apply suitable locking compound to the

pats adjusted.

Adjustment Location: Record/Playback Head (Deck A and B)

and main board.

reverse

forward

Tape Speed Adjustment DECK A

Note: Start the Tape Speed adjustment as below after setting to the

test mode.

Procedure:

Mode: Playback (FWD)

1. Insert the WS-48B into the deck A and the blank tape into the

deck B.

2. Press the REC button and ·button on the deck B. Then

the deck B is at recording mode.

3. Set the deckA to playback mode.

4. Press the DUBBING SPEED HIGH button in playback mode.

Then at HIGH speed mode.

5. Adjust RV652 on the AUDIO board do that frequency counter

reads 6,000 ± 90 Hz.

6. Press the DUBBING SPEED NORMAL button in playback

mode.

Then at NORMAL speed mode.

7. Adjust RV651 on theAUDIO board so that frequency counter

reads 3,000 ± 90Hz.

8. FrequencydifferencebetweendeckAanddeck Bthe beginning

of the tape should be within ± 1.5 %.

Adjustment Location: AUDIO board

Sample Value of Wow and flutter

W.RMS (JIS) within 0.3%

(test tape: WS-48B)

Playback level Adjustment DECK A DECK B

Procedure:

Mode: Playback (FWD)

Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301

(L-CH) and RV401 (R-CH) so that adjustment within adjustment

level as follows.

Adjustment Level:

VIDEO1 AUDIO OUT PB level: 301.5 to 338.3 mV (–8.2 to

–7.2 dB) level difference between the channels: within ± 0.5

Adjustment Location: AUDIO and main boards

Screw

position

L-CH

peak

within

1dB

output

level

L-CH

peak R-CH

peak

within

1dB

Screw

position

R-CH

peak

set

test tape

P-4-A100

(10kHz, –10dB) oscilloscope

waveform of oscilloscope

in phase 45

135

180

good wrong

rear panel

VIDEO1

AUDIO OUT connector

–

set

test tape

WS-48B

(3 kHz, 0 dB) frequency counter

rear panel

VIDEO1

AUDIO OUT connector

(L: L-CH)

(R: R-CH)

–

level mete

set

test tape

P-4-L300

(315 Hz, 0 dB) rear panel

VIDEO1

AUDIO OUT connector

(L: L-CH)

(

R: R-CH

)

— 6 —

Record bias Current Adjustment DECK B

Procedure:

1. Mode: Record

2. Mode: Playback

Confirm playback the signal recorded in step 1 become adjustable

limits as follows.

If these levels do not adjustable limits, adjustment the RV341 (L-

CH) and RV441 (R-CH) on the AUDIO board to repeat steps 1 and 2.

Adjustable limits: Playback output of 315 Hz to playback output

of 10 kHz: ±0.5 dB

Adjustment Location: AUDIO and main boards

Record Level Adjustment DECK B

Procedure:

1. Mode: Record

2. Mode: Playback

Confirm playback the signal recorded in step 1 become adjustable

limits as follows.

If these levels do not adjustable limits, adjustment the RV511 (L-

CH) and RV521 (R-CH) on the main board to repeat steps 1 and 2.

Adjustable limits:

CN207 PB level: 47.3 to 53.1 mV (–24.3 to –23.3 dB)

Adjustment Location: main board

[MAIN BOARD] (Component Side)

[AUDIO BOARD] (Conductor Side)

attenuator

set

CD IN connector (L: L-CH)

(R: R-CH)

1) 315 Hz

2) 10 kHz 50 mV (–23.8 dB)







600

Ω

blank tape

CS-123

AF OSC

rear panel

–

set

recorded

portion level mete

rear panel

VIDEO1

AUDIO OUT connector

(L: L-CH)

(

R: R-CH

)

set

CD IN connector (L: L-CH)

(R: R-CH)

315 Hz, 50 mV (–23.8 dB) blank tape

CS-123

600

Ω

attenuator

AF OSC

rear panel

–

set

recorded

portion level mete

rear panel

VIDEO1

AUDIO OUT connector

(L: L-CH)

(

R: R-CH

)

IC303

IC501

J301

J302

RV511

RV521

CN317

CN321

CN361 CN363

RV301

RV401 L

PB LEVEL

— DECK B —

— DECK A —

(NORMAL)

RV651 (HIGH)

RV652

LEVEL

RV311

RV411

TAPE SPEED

RECORD

BAIS

RV441 RV341

— 7 —

— 8 —

SECTION 4

DIAGRAMS

4-1. CIRCUIT BOARDS LOCATION

DISPLAY BOARD

TEN KEY BOARD

SUB HP BOARD

HP BAORD

SECONDARY BOARD

DECK A BOARD

LEAF SWITCH BOARD

AUDIO BOARD

DECK B BOARD WOOFER BOARD

POWER BOARD

MAIN BOARD

TUNER UNIT

PRIMARY BOARD

AC BOARD

HST-471

4-2. BLOCK DIAGRAM

— 9 — — 10 — — 11 —

• Signal path

: TUNER/AUDIO

: PB (DECK A)

: PB (DECK B)

: REC (DECK B)

: CD

: VIDEO-1 AUDIO

: VIDEO-2 AUDIO

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