Sony Cfs-b5lmk2 User manual

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Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MF-B5MK2-117

SERVICE MANUAL

East European Model

CFS-B5LMK2

RADIO CASSETTE-CORDER

MICROFILM

Frequency range

FM: 65.0 - 108 MHz

MW: 531 - 1,602 kHz

LW: 153 - 279 kHz

SW: 5.95 - 18 MHz

Aerials

FM/SW: Telescopic antenna

MW/LW: 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

230 V AC, 50 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 1999. 05

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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. Cabinet (Front) Sub Assy (B).............................................. 5

2-2. Chassis (Tune) ..................................................................... 5

2-3. Tape Mechanism Block ....................................................... 6

2-4. Tuner, AC, Second Board .................................................... 6

2-5. Audio, Microphone, ISS Board ........................................... 7

2-6. Dial Pointer Setting .............................................................7

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

4. ELECTRICAL ADJUSTMENTS

4-1. Tape Recorder Section ........................................................ 8

4-2. Tuner Section ...................................................................... 9

5. DIAGRAMS

5-1. Block Diagram .................................................................. 11

5-2. Circuit Boards Location .................................................... 13

5-3. Printed Wiring Board –Tuner Section– ............................. 14

5-4. Schematic Diagram –Tuner Section–................................ 15

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

5-6. Schematic Diagram –Main Section–................................. 19

6. EXPLODEDVIEWS

6-1. Cabinet (Front) Section .....................................................21

6-2. Cabinet (Rear) Section ...................................................... 22

6-3. Tape Mechanism Deck Section (1) ................................... 23

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

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•The equipment can be removed using the following procedure.

Set /Cabinet (front) sub assy (B) /Chassis (TUNE) /Tape mechanism block /

Tuner, AC, Second board /Audio, Microphone, ISS board

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

2-1. CABINET (FRONT) SUB ASSY (B)

SECTION 2

DISASSEMBLY

2-2. CHASSIS (TUNE)

BVTP 3x12

BVTP 3x16

BVTP 3x12

CN912

cabinet (front)

sub assy (B)

lid, battery case

chassis (TUNE)

knob (TUNE)

knob (FUNCTION)

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)

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2-6. DIAL POINTER SETTING

2-5. AUDIO, MICROPHONE, ISS BOARD

knob (TONE)

chassis (MD)

lever (FUNCTION)

!¡

tapping screw (3x12)

!™

lSS board

BVTP 3x10

MICROPHONE board

SUPPORT board

BVTP 3x10

AUDIO board

CN341

knob (VOL)

Set the pointer to the

center of scratched lines.

Set the chassis (TUNE).

BVTP 3x10

Turn gear (VC) counterclockwise

to the end.

pointer

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0000

jack (J301)

digital frequency

counter

set

Ω

test tape

WS-48A

(3 kHz, 0 dB)

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 RECORDER SECTION 0 dB = 0.775V

Standard Output Level

Output terminal HP OUT

load impedance 32 Ω

output signal level 0.25 V (–10 dB)

TestTape

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

Adjust so that the value on the digital frequency counter is

3,000 Hz.

Specification Value:

Digital frequency counter

2,970 – 3,030 Hz

Adjust so that the frequency at the beginning and that at the end of

tape winding are between 2,955 to 3,045 Hz.

Adjustment Location:

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/LW Section

Setting:

BAND switch: MW or LW

30% amplitude

modulation by 400 Hz signal

output level : as low as possible

• SW Section

Setting:

BAND switch: SW

FINE TUNE control: mechanical mid

FM FREQUENCY COVERAGE ADJUSTMENT