Sony CFSB-7-S Mk2 Service manual

CFS-B7SMK2

SERVICE MANUAL

Ver 1.1 1998. 11

SPECIFICATIONS

Frequency range

FM : Saudi Arabia 87.6 – 107 MHz

Other countries 87.6 – 108 MHz MW : 530 – 1,605 kHz SW1 : 2.3 – 7 MHz SW2 : 7 – 22 MHz

Aerials

FM/SW : Telescopic aerial MW : Built-in ferrite bar

Recording system

2-track, 4-channel stereo

Frequency response

70 – 10,000 Hz

Speakers

Full range : 10 cm (4 inches) dia,

2.8 ohms cone type × 2

Output

Headphones jack (stereo minijack), for 16 – 68 ohms impedance headphones

Maximum Power output

2.5 W + 2.5 W

E Model

Model Name Using Similar Mechanism NEW T ape Tr ansport Mechanism Type MF-B7S-148

Battery life

FM Recording : Sony R20P : Approx.

16 hours/Sony LR20 alkaline : Approx. 36 hours

Playback : Sony R20P : Approx.

8 hours/Sony LR20 alkaline : Approx. 21 hours

Power requirements

110 – 120 V/220 – 240 V AC selectable, 50/60 Hz

Power consumption

AC 14 W

Dimensions

Approx. 500 × 155 × 164 mm (w/h/d) (193/4 × 61/8 × 61/2 inches) incl. projecting parts and controls, not incl. handle

Mass

Approx. 2.7 kg (5 lb 15 oz) not 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

Location of Controls··························································· 3 Listening to the Radio ························································ 3 Playing a Tape ···································································· 3 Recording ··········································································· 4 Choosing Power Sources···················································· 4

2. DISASSEMBLY

2-1. Front Cabinet Assy ····························································· 5 2-2. Chassis (Tune) ···································································· 5 2-3. Tape Mechanism Block ······················································ 6 2-4. Tuner, AC, Second Board ···················································6 2-5. Audio, Mic Board······························································· 7 2-6. Dial Pointer Setting ···························································· 7

3. MECHANICAL ADJUSTMENTS···························· 8

4. ELECTRICAL ADJUSTMENTS

4-1. Tape Section ······································································· 8 4-2. Tuner Section······································································ 9

5. DIAGRAMS

5-1. Circuit Boards Location ··················································· 11 5-2. Printed Wiring Board —Tuner Section — ······················· 12 5-3. Schematic Diagram —Tuner Section —·························· 13 5-4. Schematic Diagram — Audio Section —························· 15 5-5. Printed Wiring Board — Audio Section —····················· 17

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 6-5. Mechanism Deck Section (3) ··········································· 23 6-6. Mechanism Deck Section (4) ··········································· 24

7. ELECTRICAL PARTS LIST··································· 25

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 .

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SECTION 1

GENERAL

This section is extracted from instruction manual.

— 3 —

— 4 —

SECTION 2

• The equipment can be removed using the following procedure.

Set / Front cabinet assy / Chassis (TUNE) / Tape mechanism block / Tuner, AC, Second board / Audio, Mic board

DISASSEMBLY

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

2-1. FRONT CABINET ASSY

CN912

front cabinet assy

BVTP 3

× ×

16 12

2-2. CHASSIS (TUNE)

Fig. A

Fig. B

slider, D

indicator

BVTP 3

lid, battery case

knob (TUNE)

knob (BAND)

indicator

Note : Be careful when removing

as it is engaged as shown

in Fig. A and Fig. B.

chassis (TUNE)

BVTP 3

— 5 —

2-3. TAPE MECHANISM BLOCK

CN601

tape mechanism block

CN301

BVTP 3

2-4. “ TUNER BOARD ”, “ AC BOARD ”, “ SECOND BOARD ”

SECOND board

T901

BVTP 3 × 10

CN911

knob (FINE TUNE)

CN901

AC board

BVTP 3 × 10

— 6 —

TERMINAL,

ANTENNA

TUNER board

CN1

2-5. “ AUDIO BOARD ”, “ MIC BOARD ”

chassis (MD)

lever (FUNCTION)

BVTP 3 × 10

BVTP 3x10

AUDIO board

knob (VOLUME)

knob

(HYPER TREBLE/MEGA BASS)

MIC board

SUPPORT board

2-6. DIAL POINTER SETTING

Set the pointer to the

center of three vertical lines.

pointer

Set the chassis (TUNE).

BVTP 3 × 10

— 7 —

Turn the VC drum in the direction

of the allow to its end.

SECTION 3

MECHANICAL ADJUSTMENTS

SECTION 4

ELECTRICAL ADJUSTMENTS

PRECAUTION

1. Clean the following parts with a denatured alchool-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 magnetized screwdriver for the adjustments.

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

5. The adjustments should be perfomed with the rated power supply voltage unless otherwise noted.

Torque Measurement

Mode

Forward Forward

back tension

REV

REV back Tension Fast Forward

Rewind

T ape Tension Measurement

Mode

Forward

Torque Meter

CQ-102C

CQ-201B

Torque Meter

CQ-403A

Meter Reading

25 – 60 g•cm

(0.35 – 0.83 oz•inch)

1 – 5 g•cm

(0.014 – 0.069 oz•inch)

25 – 60 g•cm

(0.35 – 0.83 oz•inch)

1 – 5 g•cm

(0.014 – 0.069 oz•inch

55 – 140 g•cm

(0.76 – 1.94 oz•inch)

55 – 140 g•cm

(0.76 – 1.94 oz•inch)

Meter Reading

more than 170 g

(more than6.00 oz)

4-1. TAPE SECTION

Standard output level

Output terminal

Load impedance

Output signal level

Test tape

T est Tape

WS-48B

P-4-A063

Tape Speed Adjustment

Procedure :

Mode : Playback

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

1. Playback the test tape in the FWD playback mode.

2. Confirm that the digital frequency counter reading indicates a value in the range of 2,940 to 3,060 Hz at tape top.

3. If the specification is not satisfied, adjust variable resistor of motor (M901) until the frequency counter reading is as close to 3,000 Hz as possible at the FWD tape top. Specification : 2,940 to 3,060 Hz

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

Adjustment Location :

Signal

3kHz, 0dB

6.3 kHz, -10 dB

set

phones jack

tape speed adjustment

head azimuth adjustment

Ω

0dB = 0.775V

HP OUT

32 Ω

0.25 V (–10 dB)

Used for

digital frequency counter

0000

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TAPE SPEED ADJ. (M901)

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