Sony Cfs-b5smk2 User manual

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Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MF-B5MK2-117

SERVICE MANUAL

E Model

CFS-B5SMK2

RADIO CASSETTE-CORDER

MICROFILM

Frequency range

FM Saudi Arabia model 87.6 - 107 MHz

Other countries model 87.6 - 108 MHz

MW 530 - 1,605 kHz

SW1 2.3 - 7 MHz

SW2 7 - 22 MHz

Aerials

FM/SW: Telescopic antenna

MW: Built-in ferrite bar

Recording system

4-track, 2-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

SPECIFICATIONS

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

9 V DC, six R20 (size D) batteries

Power consumption

AC 14 W

Dimensions

Approx. 500 ×155 ×164 mm (w/h/d)

(19 3/4 ×6 1/8 ×6 1/2 inches) incl. projecting parts

and controls, not incl. handle

MassApprox. 2.7 kg (5 lb. 15 oz.) not incl. batteries

Supplied accessory

Mains lead (1)

Design and specifications are subject to change without

notice.

Ver 1.0 1998. 06

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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, Microphone 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–............................. 11

5-3. Schematic Diagram –Tuner Section–................................ 12

5-4. Schematic Diagram –Main Section–................................. 14

5-5. Printed Wiring Boards –Main Section– ............................ 17

6. EXPLODEDVIEWS

6-1. Front Cabinet Section........................................................ 20

6-2. Rear Cabinet Section......................................................... 21

6-3. Mechanism Deck Section (1) ............................................22

6-4. Mechanism Deck Section (2) ............................................23

7. ELECTRICAL PARTS LIST......................................... 24

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.

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SECTION 2

DISASSEMBLY

•The equipment can be removed using the following procedure.

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

Audio, Microphone board

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

2-1. FRONT CABINET ASSY

BVTP 3x12

BVTP 3x16

BVTP 3x12

CN912

front cabinet assy

battery case

2-2. CHASSIS (TUNE)

chassis (TUNE)

knob (TUNE)

knob (BAND

)

BVTP 3x10

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2-3.TAPE MECHANISM BLOCK

2-4.TUNER, AC, SECOND BOARD

BVTP 3x10

CN301

tape mechanism block

CN601

BVTP 3x10

CN1

CN901

CN911

TUNER board

AC board

!¡

SECOND board

BVTP 3x10

knob (FINE TUNE)

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2-5. AUDIO, MICROPHONE BOARD

2-6. DIAL POINTER SETTING

knob (TONE)

chassis (MD)

lever (FUNCTION)

BVTP 3x10

MICROPHONE board

SUPPORT board

BVTP 3x10

AUDIO board

knob (VOL)

Set the pointer to the

center of scratched lines.

Set the chassis (TUNE).

BVTP 3x10

Turn VC drum counterclockwise

to the end.

pointer

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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 demagne-

tizer. (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 performed with the rated power

supply voltage unless otherwise noted.

Torque Measurement

Mode Torque meter Meter reading

Forward CQ-102C 25 – 60 g • cm

(0.35 – 0.83 oz • inch)

Forward CQ-102C 1 – 5 g • cm

back tension (0.014 – 0.069 oz • inch)

Fast CQ-201B 55 – 140 g • cm

Forward (0.76 – 1.94 oz • inch)

Rewind CQ-201B 55 – 140 g • cm

(0.76 – 1.94 oz • inch)

TapeTension Measurement

Mode Tension meter Meter reading

Forward CQ-403A more than 170 g

(more than 6.00 oz)

SECTION 4

ELECTRICAL ADJUSTMENTS

SECTION 3

MECHANICAL ADJUSTMENTS

4-1.TAPE SECTION 0 dB = 0.775V

Standard Output Level

Output terminal HP OUT

load impedance 32 Ω

output signal level 0.25 V (–10 dB)

Test Tape

Type Signal Used for

WS-48A 3 kHz, 0 dB tape speed adjustment

P-4-A063 6.3 kHz, –10 dB head azimuth adjustment

Tape Speed Adjustment

Procedure:

Mode: playback

Adjustment Value:

Digital frequency counter

2,970 – 3,030 Hz

Frequency difference between the beginning and the end of the tape

should be within 1.5% (45 Hz).

Adjustment Location:

0000

phones jack

digital frequency

counter

set

Ω

test tape

WS-48A

(3 kHz, 0 dB)

tape speed adjustment

control inside motor

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4-2.TUNER SECTION 0 dB = 1 µV

• FM Section

Setting:

BAND switch: FM

22.5 kHz frequency

deviation by 400 Hz signal

output level : as low as possible

• MW Section

Setting:

BAND switch: MW

30% amplitude

modulation by 400 Hz signal

output level : as low as possible

• SW Section

Setting:

BAND switch: SW1 or SW2

FINE TUNE control: mechanical mid

FM FREQUENCY COVERAGE ADJUSTMENT