Sony TC-KB820S Manuale utente

MICROFILM

SERVICE MANUAL

STEREO CASSETTE DECK

AEP Model

UK Model

Australian Model

Model Name Using Similar Mechanism TC-KE400S

Tape Transport Mechanism Type TCM-190VB12CSS

SPECIFICATIONS

TC-KB820S

Dolby noise reduction and HX Pro headroom ex-

tension manufactured under license from Dolby

Laboratories Licensing Corporation. HX Pro origi-

nated by Bang & Olufsen.

“DOLBY”, the double-D symbol a, and “HX PRO”

aretrademarks ofDolbyLaboratoriesLicensingCor-

poration.

– Continued on next page –

– 2 –

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

SAFETY-RELATED COMPONENT WARNING!!

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 PUB-

LISHED BY SONY.

MODEL IDENTIFICATION

– BACK PANEL –

3-020-983-

AEP Model : 0

π

UK Model : 1

Australian Model : 2

– 3 –

TABLE OF CONTENTS

1. GENERAL ................................................................... 4

2. DISASSEMBLY ......................................................... 5

3. MECHANICAL ADJUSTMENTS....................... 9

4. ELECTRICAL ADJUSTMENTS......................... 10

5. DIAGRAMS

5-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 14

5-2. Printed Wiring Boards – MD Section –......................... 15

5-3. Schematic Diagram – MD Section – .............................. 17

5-4. Printed Wiring Board – MAIN Section – ...................... 19

5-5. Schematic Diagram – MAIN Section – (1/3)................. 21

5-6. Schematic Diagram – MAIN Section – (2/3)................. 23

5-7. Schematic Diagram – MAIN Section – (3/3)................. 25

5-8. Printed Wiring Board – DOLBY-S Section –................ 29

5-9. Schematic Diagram – DOLBY-S Section – .................. 29

5-10. Printed Wiring Boards – PANEL Section – .................. 31

5-11. Schematic Diagram – PANEL Section – ........................ 33

5-12. IC Pin Function Description ........................................... 35

6. EXPLODED VIEWS................................................ 37

7. ELECTRICAL PARTS LIST ............................... 42

– 4 –

SECTION 1

GENERAL

LOCATION OF CONTROLS

1I/O (Power) button

2Remote control sensor

3PHONES jack

4Display panel

5Tape operation buttons

AMS* 0button

·button

AMS* )button

pbutton

PPAUSE button

RREC MUTING button

rREC button

6Tape counter

7Counter buttons

RESET button

MEMORY button

8Cassette holder

9§EJECT button

!º AUTO CAL button

!¡ DOLBY NR switch

!™ BALANCE control

!£ REC LEVEL control

* AMS is an abbreviation for Automatic Music Sensor.

– 5 –

FRONT PANEL SECTION

MD ASS’Y SECTION

Note: Follow the disassembly procedure in the numerical order given.

SECTION 2

DISASSEMBLY

CASE

Unscrew the four case attachment seven tapping screws

and remove the case.

flat cable

(CN801)

screw

(BVTP3

four screws

(BVTP3

two connectors

(CNP31, 33)

screw

(BVTP3

claw

flat cabl

(CN504)

two earth

lugs

connector

(CN704)

flat cable

(CN81)

connector

(CN506)

front panel section

two screws

(BVTT2.6

Remove the MD ass’y section

to direction of arrow

two screws

(BVTP2.6

two claws

push the eject

button.

two claws

cassette lid

ass’y

– 6 –

MAIN BOARD

CASSETTE HOLDER (R) ASS’Y

two screws

(BVTP3

screw

(BV/ring)

MAIN board

connector

(CN701)

screw

(BV/ring)

bracket (TR)

boss

shaft

torsion spring

cassette holder (R)

ass’y

– 7 –

FITTING BASE BLOCK

HEAD

two screws

(PTPWH2

23)

screw

(PTPWH2

23)

Note: When installing, pull

the FR belt and put

around the claws as

shown below.

connector

(CNP32)

fitting base block

Note: When installing, pull the capstan belt

and put around the claws as shown below.

screw

(B2

10)

connecto

(CNP32)

azimuth screw

record/playback head

compression spring

erase head

– 8 –

MOTOR

two screws

(B2.6

two screws

(P2.6

2.8)

flexible board

(CNP72)

connector

(CNP71)

claw

two

claws

capstan motor

!º

ground plate

audio

boar

reel motor

FR belt

– 9 –

SECTION 3

MECHANICAL ADJUSTMENTS

PRECAUTION

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

swab:

record/playback/erase head pinch roller

rubber belts capstan

idler

2. Demagnetize the record/playback head with a head demagne-

tizer.

(Head demagnetizer do not approach for the erase head.)

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

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

Mode Torque Meter Meter Reading

Forward CQ-102C 30 to 60 g•cm

(0.42 to 0.83 oz•inch)

Forward

back CQ-102C 2 to 7 g•cm

tension (0.03 to 0.09 oz•inch)

FF/REW CQ-201B 70 to 110 g•cm

(0.98 to 1.52 oz•inch)

– 10 –

SECTION 4

ELECTRICAL ADJUSTMENTS

Note: The adjustment should be performed in the order given in the ser-

vice manual.As a rule, adjustments about playback should be per-

formed before those about recording.

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

CH.

• Switches and controls should be set as follows unless otherwise

specified.

DOLBY NR, MPX FILTER switch: OFF

• Standard Record:

Deliver the standard input signal level to the input jack and set

the REC LEVEL control to obtain the standard output signal

level.

– Record Mode –

0 dB = 0.775 V

Standard Input Level

input terminal LINE IN

source impedance 10 kΩ

input signal level 0.5 V (–3.8 dB)

Standard Output Level

output terminal LINE OUT

load impedance 47 kΩ

output signal level 0.5 V (–3.8 dB)

TestTape

Type Signal Used for

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

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

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

Test Mode

1. Insert a short-circuit plug into TP801 (2P) and turn ON the

power switch. (Earth pin &ª of IC801 and turn ON the power

switch.)

At first, all the fluorescent tubes light up, then the system re-

turns to normal display. (However, “00 00” is not displayed on

the counter.)

2. To release the test mode, remove the short plug and turn off

the power switch.

3. Remove the short plug after completion of adjustment.

–

set

47 k

Ω

LINE OUT

LINE IN

600

Ω

10 k

Ω

attenuator

AF OSC level meter

Record/Playback Head Azimuth Adjustment

Procedure:

1. Mode : FWD playback

2. Turn the adjustment screw for the maximum output levels. If

these levels do not match, turn the adjustment screw until both

of output levels match together within 1 dB.

3. Phase Check

Mode : playback

4. After the adjustment, lock the screw with locking compound.

Adjustment Location: Record/Playback head

–

set

47 k

Ω

LINE OUT

level mete

Test tape

P-4-A100

(10 kHz, –10 dB)

Screw

position

L-CH

peak

within

1dB

output

level

L-CH peak R-CH peak

within

1dB

angl

R-CH

peak

–

Screen pattern

Good Wrong

in phase 45

135

180

LINE OUT

set

R-CH

L-CH 47 k

Ω

47 k

Ω

oscilloscope

test tape

P-4-A100

(10 kHz, –10 dB)

Adjustment screw

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