Sony CFSB-21-L Service manual

CFS-B21L

SERVICE MANUAL

Ver 1.0 1999. 06

With SUPPLEMENT-1 (9-923-272-81)

SPECIFICATIONS

Frequency range FM : 87.6–107 MHz

MW : 531–1,602 kHz L W : 153–279 kHz

IF FM : 10.7 MHz

MW/LW : 455 kHz

Aerials FM : Telescopic

MW/LW : Built-in ferrite bar Recording system 4-track, 2-channel stereo Frequency response 100-10,000Hz Speakers Full-range : 10cm (4 inches) dia.×2,

cone type Output Headphones jack (stereo minijack), for

16 to 68 ohms impedance headphones Maximum power output 2.0W+2.0W Battery life FM Recording : Sony R20P : Approx.

9 hours/Sony alkaline LR20 : Approx.

21 hours

Playback : Sony R20P : Approx.

6 hours/Sony alkaline LR20 : Approx.

13 hours

AEP Model

UK Model

Model Name Using Similar Mechanism CFS-B15 Tape Transport Mechanism Type MF-B15-117

Power requirements 230V AC, 50Hz

6V DC, four R20 (size D) batteries

Power consumption AC 13W Dimensions Approx. 422×140×136mm (w/h/d)

(165/8 × 55/8 × 53/8 inches) incl. projecting parts and controls

Mass Approx. 1.9kg (4lb 3 oz) incl.

batteries

Supplied accessory Mains lead (1)

Design and specifications are subject to change without notice.

MICROFILM

RADIO CASSETTE-CORDER

TABLE OF CONTENTS

1. GENERAL ··································································· 3

2. DISASSEMBLY

2-1. Removal of Front Cabinet ··············································· 4 2-2. Removal of Mechanism Deck ········································· 4 2-3. Dial Pointer Setting ························································· 5

3. MECHANICAL ADJUSTMENTS························· 6

4. ELECTRICAL ADJUSTMENTS

4-1. Tape Recoder Section······················································ 6 4-2. Radio Section ·································································· 7

5. DIAGRAMS

5-1. Circuit Board Location ···················································· 9 5-2. IC Block Diagrams ·························································· 10 5-3. Printed Wiring Board – Main Section – ·························· 11 5-4. Schematic Diagram – Main Section – ····························· 13 5-5. Printed Wiring Board and Schematic Diagram

– Tuner Section –····························································· 16

6. EXPLODED VIEWS

6-1. Front Cabinet Section ······················································ 19 6-2. Rear Cabinet Section ·······················································20 6-3. Mechanism Deck Section (1) ·········································· 21 6-4. Mechanism Deck Section (2) ·········································· 22

7. ELECTRICAL PARTS LIST ·································· 23

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 PUBLISHED BY SONY.

— 2 —

SECTION 1

GENERAL

!¡ !™ !£ !¢ !∞ !§

1 FM MODE/ISS switch 2 2 (phones) jack 3 MEGA BASS button 4 VOLUME knob 5 TONE knob 6 MIC 7 ORP/BATT indicator 8 FUNCTION switch 9 BAND switch !º TUNING knob !¡ PAUSE button !™ STOP/EJECT button !£ FF button !¢ REW button !∞ PLAY button !§ REC button

!º

— 3 —

SECTION 2

DISASSEMBLY

• The equipment can be removed using the following procedure. Front cabinet Mechanism Deck Main board Volume board

Retainer board Dial Pointer Bracket Power board Battery board Tuner board

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

2-1. REMOVAL OF FRONT CABINET

+BVTP 3 × 14

Push the

EJECT button

battery case lid

+BVTP 3 × 1

2-2. REMOVAL OF MECHANISM DECK

Remove the mechanism deck

in the direction of the arrow.

front cabinet

+BVTP 3 × 10

— 4 —

SECTION 3

color code

CF1

)

frequency counter

33k

Ω

MECHANICAL ADJUSTMENTS

SECTION 4

ELECTRICAL ADJUSTMENTS

2-3. DIAL POINTER SETTING

stopper (stopper is a part of dial pointer bracket, and located at the left end.)

Insert the pointer into stopper

and set for tuning knob.

Turn tuning knob fully in the

direction of the arrow.

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. (Do not bring the head demagnetizer close to the erase head.)

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

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

5. The adjustment should be perfomed with the reted power supply voltage unless otherwise noted.

6. Power supply voltage: 6V dc.

Torque Measurement

Torque

Forward Forward

back tension Fast

Forward Rewind

Torque meter

CQ-102C

CQ-201B

Meter reading

30-70g•cm

(0.42-0.97 oz•inch)

1.5-5.5g•cm

(0.020-0.076 oz•inch)

more than 60g•cm

(more than 0.83 oz•inch)

more than 60g•cm

(more than 0.83 oz•inch)

Tape Tension Measurement

Torque meter

Meter reading

more than 100g

CQ-403A

(more than 3.53 oz)

4-1. TAPE RECODER SECTION

Standard Output Level

output terminal

load impedance

output signal level

T est Tape

Type

WS-48A

P-4-A063J

6.3kHz, –10dB

Tape Speed Adjustment

Procedure : Mode : playback

test tape WS-48A (3kHz, 0dB)

set

Adjustment Value :

Speed checker

–1% to +1%

Frequency difference between the beginning and the end of the tape should be within 1.5% (45Hz).

Adjustment Location :

HP OUT

0.25V (–10dB)

Signal

3kHz, 0dB

phones jack

SP OUT

12 0dB

Used for

tape speed adjustment

head azimuth adjustment

speed checker LFM-30 or digital frequency counter

32k

Ω

Digital frequency counter

2,970–3,030Hz

4-2. RADIO SECTION

• FM Section

Setting : FUNCTION switch : RADIO BAND switch : FM

FM RF signal generator

22.5kHz frequency deviation by 400Hz signal output level : as low as possible

* : The FM IF adjustment specifications are different depending

upon the color code of CF1. See the following table.

CF1 color

Red

Blue

Orange

Black White

frequency

10.70MHz

10.67MHz

10.73MHz

10.64MHz

10.76MHz

• MW Section

Setting : FUNCTION switch : RADIO BAND switch : MW

AM RF signal generator

30% amplitude modulation by 400Hz signal output level : as low as possible

telescopic antenn input

0.01

set

Put the lead-wire antenna close to the set.

( ) : EE1 model

Adjust for a maximum reading on level meter.

FM IF ADJUSTMENT

• LW Section

FUNCTION switch : RADIO BAND switch : LW

AM RF signal generator

30% amplitude modulation by 400Hz signal output level : as low as possible

set

phones jack

Put the lead-wire antenna close to the set.

Ω

level meter (range : 0.5–5V ac

+ –

• Repeat the procedures in each adjustment several times, and

the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

Adjustment Location : TUNER BOARD (COMPONENT SIDE)

L6 : MW FREQUENCY COVERAGE

CT4 : MW FREQUENCY COVERAGE

CT5 : LW FREQUENCY COVERAGE

L5 : LW FREQUENCY COVERAGE

CT3 : MW TRACKING

CT2 : FM FREQUENCY COVERAGE

CF1

CT1 : FM TRACKING

L2 : FM FREQUENCY COVERAGE

L1 : FM TRACKING

L12 : AM IF

CF2

Adjustment Location :

[TUNER BOARD] (conductor side)

level meter (range : 0.5–5V ac

Ω

set

phones jack

tape speed adjustment control inside motor

— 5 —

— 6 — — 7 — — 8 —

+ –

L4 : FM IF

RV1 : FM VCO

L3 : MW TRACKING, LW TRACKING

CT10 : LW TRACKING

FM VCO Adjustment

Procedure :

FM RF signal generator

Carrier frequency : 98MHz Modulation : no modulation Output level : 0.1V (100dB)

telescopic antenn input terminal

0.01

set

1. Connect frequency counter as shown below.

2. Tune the set to 98MHz.

3. Adjust RV1 for 76kHz±50Hz reading on the frequency counter .

CFS-B21L

5-1. CIRCUIT BOARDS LOCATION

MAIN board

SECTION 5

DIAGRAMS

BATTERY board

VOLUME board

RETAINER board

TUNER board

5-2. IC BLOCK DIAGRAMS

• IC1 CXA1238S

GND

PLL LPF2

30 29

VCO MPX REG.

MONO/ST

MPX REG

VCOFMDISCRI

28 27 26 25 24 23 22 21 20 19 18 17 16

SELECT

MUTE

AM OSC

1/2

COUNTER

1/2

COUNTER

MUTING

DECODER AMP

AFC

FM OSC

REG

PD1

PD2

AUTOBLEND

RIPPLE

FILTER

FM RF

AM RF IN

FM FRONT-END

AM FRONT-END

BAND PASS

MUTE

FM RF IN

INDICATOR

FM IF/

DISCRI

IF/DET

TUNING

FM GND

FM/AM

FE OUT

5-3. PRINTED WIRING BOARD — MAIN SECTION —

POWER board

4 5 6 7 8 9 10 11 12 13 14 15321

PLL LPF1

ST IND/

VCO CHECK

PILOT DET LPF2

• IC101,201 MM1315BD

MIC-IN

B+

VCC

FILTER

L CH OUT

R CH OUT

AUX-INSWSWSWNCNCSW

29 28 27 26 25 24 23 22 21 20 19 18 17 16

B+

RIPPLE

AGC AFC1

LPF-2

B+

AGC AFC2

ALC

GND

B+

TUNE IND

POP-NOISE-DEL

POWER GND

FM IF IN

AM IF IN

BAND SELECT

POWER-OUT-A

VCC

S VCC

B+

MIC IN (–)

HEAD-IN (+)

3 4 5 7 8 9 10 11 12 13 14 156

PRE

PRE-IN

HEAD-IN (–)

VBIAS2

VBIAS1

— 9 — — 10 —

B+

SIG-GND

R-VCC

LIN-OUT

POWER IN

RIP-FIL

POWER GND

• Semiconductor Location

Ref. No. Location

D301 E-13 D304 C-7 D305 C-7 D306 A-13 D307 C-7 D308 C-7 D309 D-11 D901 D-2 D902 D-1 D903 D-3 D904 D-1

IC101 C-11

POWER-OUT-B

IC201 C-12

Ref. No. Location

Q101 C-7 Q102 C-8 Q201 C-7 Q202 C-8 Q301 E-12 Q303 D-13 Q304 C-13 Q305 C-13 Q306 B-13 Q307 E-12 Q308 C-7

Note:

• X : parts extracted from the component side.

• W : indicates side identified with part number.

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