DOWNLOAD Sony HST-471 / SEN-471 Service Manual ↓ Size: 875.13 KB | Pages: 29 in PDF or view online for FREE

MICROFILM

Tape deck

Model Name Using Similar Mechanism

HCD-GR8/RX90

Section

Tape Transport Mechanism Type

TCM-220WR2

Manufactured under license from Dolby
Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol 

a

 are

trademarks of Dolby Laboratories Licensing
Corporation.

— Continued on next page —

This set is the tunerdeck
and amplifier section
in SEN-R4720/R5750.

— 2 —

! OR DOTTED LINE WITH

! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS

— 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 NO. HST-471

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

·························· 4

···························· 4

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

5-1.

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

··································· 44

— 3 —

1

10 KEY

2

MEMORY

3

TUNING (–/+)

4

BAND

5

MEMORY SCAN

6

STEREO/MONO

7

POWER

8

CENTER MODE

9

SURROUND 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)

!§

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 —

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.

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
service manual.  (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)

6.

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

7.

Switches and controls should be set as follows unless otherwise
specified.

8.

Set to test mode.  (Press key switch same time

SPECTRUM ANALYZER   ENTER/NEXT and
EFFECT ON/OFF button.)

•

Test Tape

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

of cassette holders.

Procedure:
1.

Mode:  Playback (FWD)

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)

Forward

CQ-403A

more than 100 g (3.53 oz)

Reverse

CQ-403R

more than 100 g (3.53 oz)

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)