Sony CFS-828-S Service manual

CFS-828S

SERVICE MANUAL

Ver 1.0 2001.11

SPECIFICATIONS

Frequency range

FM: EA model: 87.5 - 107 MHz/

E15, UAE model: 87.5 - 108 MHz

MW: EA model: 530 - 1,605 kHz/

E15, UAE model: 530 - 1,611 kHz SW1: 2.3 - 7 MHz SW2: 7 - 22 MHz

FM: 10.7 MHz MW/SW: 455 kHz

Antennas

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

Recording system

4-track, 2-channel stereo

Frequency response

80 - 12,500 Hz

Speakers

Full range: 10 cm (4 inches) dia., 6 Ω, cone type/ Tweeter: 2 cm (13/16 inches) dia.

Output

Headphones jack (stereo minijack), for 16 - 68 Ω impedance headphones

Maximum Power output

E Model

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MF-W828-117

Battery life

FM Recording: Sony R20P: Approx. 9 hours/ Sony LR20 alkaline: Approx. 23 hours Playback: Sony R20P: Approx. 3 hours/ Sony LR20 alkaline: Approx. 8 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 18 W

Dimensions

Approx. 679 × 263.5 × 239.5 mm (w/h/d) (26 6/8 × 10 3/8 × 9 4/9 inches) incl. projecting parts and controls, not incl. handle

Mass

Approx. 7.3 kg (16 lb 1 oz) incl. batteries

Supplied accessory

AC power cord (1)

Design and specifications are subject to change without notice.

• Abbreviation E15 : AC 220-240V area in E model EA : Saudi Arabia model UAE : United Arab Emirates model

9-873-410-01

2001K0400-1

RADIO CASSETTE-CORDER

Sony Corporation

Personal Audio Company

Published by Sony Engineering Corporation

CFS-828S

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

2. DISASSEMBLY

2-1. Cabinet (Rear) Assy ............................................................ 4

2-2. Power Board ........................................................................ 5

2-3. Mechanism Deck ................................................................. 5

2-4. H/P, LED2, Maxi Bass, VOL and Main Boards .................. 6

2-5. F/T and Tuner Boards .......................................................... 6

2-6. Jog and LED1 Boards ......................................................... 7

2-7. REC SW Board, Belt and Motor Assy (W) (M301) ........... 7

3. DIAL POINTER SETTING ............................................. 8

4. MECHANICAL ADJUSTMENTS ................................. 9

5. ELECTRICAL ADJUSTMENTS

Tape Section ............................................................................ 9

Tuner Section......................................................................... 10

6. DIAGRAMS

6-1. Circuit Boards Location .................................................... 12

6-2. Block Diagram .................................................................. 13

6-3. Printed Wiring Boards – Tuner Section – ......................... 14

6-4. Schematic Diagram – Tuner Section – .............................. 15

6-5. Printed Wiring Boards – Main Section – .......................... 16

6-6. Printed Wiring Boards – Power Section – ......................... 17

6-7. Schematic Diagram – Main Section (1/2) – ...................... 18

6-8. Schematic Diagram – Main Section (2/2) – ...................... 19

7. EXPLODED VIEWS

7-1. Cabinet (Rear) Section ...................................................... 21

7-2. Cabinet (Front) Section-1 .................................................. 22

7-3. Cabinet (Front) Section-2 .................................................. 23

7-4. Mechanism Deck Section-1 .............................................. 24

7-5. Mechanism Deck Section-2 .............................................. 25

7-6. Mechanism Deck Section-3 .............................................. 26

7-7. Speaker Section ................................................................. 27

8. ELECTRICAL PARTS LIST......................................... 28

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 0 OR DOTTED LINE WITH MARK 0 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.

Location of controls

SECTION 1

GENERAL

CFS-828S

This section is extracted from instruction manual.

VOLUME

Deck A

Deck B

MIC

OPR/BATT

FUNCTION

FINE TUNING

BAND

TUNING

PHONES

SOUND SELECT

ISS (rear)

VOLTAGE SELECTOR (rear)

MAXI BASS

CFS-828S

SECTION 2

DISASSEMBLY

• The equipment can be removed using the following procedure.

SET

2-1. CABINET (REAR) ASSY

(Page 4)

2-2. POWER BOARD

(Page 5)

2-4. H/P, LED2, MAXI BASS,

VOL AND MAIN BOARDS (Page 6)

2-6. JOG AND LED1

BOARDS

2-5. F/T AND TUNER BOARDS

(Page 6)

(Page 7)

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

2-1. CABINET (REAR) ASSY

cabinet (rear) assy

BVTP 3x16

2-3. MECHANISM DECK

(Page 5)

2-7. REC SW BOARD, BELT AND

MOTOR ASSY (W) (M301) (Page 7)

BVTP 3x16

CNP311

CNP1

lid, battery case

BVTP 3x16

2-2. POWER BOARD

plate (T), shield

BVTP 3x10

CFS-828S

BVTP 3x10

2-3. MECHANISM DECK

BVTP 3x10

cabinet (rear) assy

POWER board

BVTP 3x10

CNP315

CNP316

mechanism deck

CNP301

CNP305

CNP306

CNP302

CFS-828S

2-4. H/P, LED2, MAXI BASS, VOL AND MAIN BOARDS

H/P board

VOL board

BVTP 3x10

LED2 board

CNP307

claws

knob (VOL)

retainer board

BVTP 3x10

CNP417

BVTP 3x10

retainer board

MAIN boar

claws

2-5. F/T AND TUNER BOARDS

BVTP 3x10

button (MAXI BASS)

chassis (TUNE)

MAXI BASS board

BVTP 3x10

BVTP 3x1

P 2.6x4

gear (VC)

TUNER board

F/T board

knob (BAND)

knob

(FINE TUNING)

BVTP 3x10

2-6. JOG AND LED1 BOARDS

JOG board

BVTP 3x10

window (LED)

LED1 board

CFS-828S

BVTP 3x10

dial, jog

2-7. REC SW BOARD, BELT AND MOTOR ASSY (W) (M301)

deck A

belt

screw, motor

chassis (SUB)

PTT 2x5

deck B

PTT 2x5

motor assy (W) (M301)

PTT 2x6

REC SW board

rever (REC)

belt

CFS-828S

pointer

knob (TUNE) assy

SECTION 3

DIAL POINTER SETTING

gear, midway

knob (TUNE) assy

gear, midway

PTPWH 3x10

pointer

BVTP 3x10

gear (VC)

BVTP 3x10

F/T board

BVTP 3x10

TUNER board

SECTION 4

PHONES jack (J301)

set

Ω

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

digital frequency counter

MECHANICAL ADJUSTMENTS

CFS-828S

SECTION 5

ELECTRICAL ADJUSTMENTS

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 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.

6. Power supply voltage: 9 V dc.

Torque Measurement DECK A DECK B

Mode Torque meter Meter reading

2.21 to 5.39 mN • m

Forward CQ-102C 22.5 to 55 g • cm

(0.31 to 0.76 oz • inch)

Forward back tension

Fast Forward 5.89 to 11.76 mN • m and CQ-201B 60 to 120 g • cm Rewind (0.83 to 1.67 oz • inch)

Tape Tension Measurement DECK A DECK B

CQ-102C 2 to 5 g • cm

0.20 to 0.49 mN • m

(0.03 to 0.07 oz • inch)

TAPE SECTION 0 dB = 0.775 V

Standard Output Level

Output terminal SP OUT PHONES OUT

load impedance 6 Ω 32 Ω

output signal level 0.775 V (0 dB) 0.25 V (–10 dB)

Test T ape

Tape Signal Used for

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

Tape Speed Adjustment DECK A DECK B

Procedure:

• Perform normal speed adjustment before high speed check. Mode: playback (deck A)

record (deck B)

Adjust RV301 so that reading on digital frequency counter becomes 3,000 Hz.

Mode Tension meter Meter reading

Forward CQ-403A

more than 150 g

(more than 5.29 oz)

Specification Value:

Deck

A Normal (playback) RV302 3,000 to 3,030 Hz A HI-SPEED DUBBING

B HI-SPEED DUBBING

Frequency difference between the beginning and the end of the tape should be within ± 1.0% (both Normal and Hi-speed).

Adjustment Location: – main board (component side) –

– MAIN board (component side) –

Tape Adjustment Frequency

speed point counter

(playback)

(record)

RV302

(confirmation)

——— ———

5,300 to 6,300 Hz

CFS-828S

)

TUNER SECTION 0 dB = 1 µV

Common Setting:

SOUND SELECT control: FLAT VOLUME control: MAX MAXI BASS switch: OFF

• FM Section

BAND switch: FM

FM RF signal generator

75kHz frequency deviation by 1kHz signal Output level: as low as possible

• MW Section

BAND switch: MW FINE TUNING (RV2): mechanical center

AM RF signal generator

400Hz, 30% AM modulation Output level: as low as possible

telescopic antenna terminal

0.01µF

Put the lead-wir antenna close to the set.

set

FM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

L9 10.7 MHz

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

CT2

87.35 MHz (EA model)

86.5 MHz (E15, UAE model)

107.8 MHz (EA model)

109.5 MHz (E15, UAE model)

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

CT1

87.35 MHz (EA model)

86.5 MHz (E15, UAE model)

107.8 MHz (EA model)

109.5 MHz (E15, UAE model)

MW IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1 455 kHz

MW FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

CT4

516 kHz (EA model) 520 kHz (E15, UAE model)

1,635 kHz (EA model) 1,680 kHz (E15, UAE model)

• SW1/SW2 Section

BAND switch: SW1 or SW2 FINE TUNING (RV2): mechanical center

AM RF signal generator

400Hz, 30% AM modulation Output level: as low as possible

telescopic antenna terminal

12pF

set

• Common Connecting Level Meter

level meter (range: 0.5–5 V ac

32 Ω

set

PHONES jack (J301)

• Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

MW TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 600 kHz

CT3 1,400 kHz

SW1 FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L6 2.2 MHz

CT6 7.3 MHz

SW1 TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L5 2.2 MHz

< confirmation > 7.3 MHz

SW2 FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L8 6.8 MHz

CT8 22.5 MHz

SW2 TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L7 6.8 MHz

< confirmation > 22.5 MHz

Adjustment Location: See page 11

FM VCO Adjustment

Setting:

BAND switch: FM

FM RF signal generator

98MHz frequency deviation by 1kHz signal Output level: 0.1V (100dB)

CFS-828S

telescopic antenna terminal

0.01µF

set

digital frequenc counter

TUNER board

IC1 pin

33k

1µF

Ω

Procedure:

1. Connect the frequency counter to pins 4 and 7 of IC1 as shown

the figure.

2. Tune the set to 98 MHz.

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

Specification Value: 75.95 to 76.05 kHz.

Adjustment Location: – tuner board (component side) –

• Abbreviation

E15 : AC 220-240V area in E model EA : Saudi Arabia model UAE : United Arab Emirates model

ADJUSTMENT

FM FREQUENCY

ADJUSTMENT

FM IF

RV1

FM VCO

CT2, L2

COVERAGE

MW IF

– TUNER board (component side) –

E15, UAE model

RV1

EA model

IC1

1615

CT1, L1

TRACKING

ADJUSTMENT

CT2

CT1

CT3

CT4

CT6

CT8

SW2

TRACKING

ADJUSTMENT

ANT1

FM/SW

TELESCOPIC

ANTENNA

CNP1

CT6, L6 SW1 FREQUENCY COVERAGE ADJUSTMENT

CT4, L4 MW FREQUENCY COVERAGE ADJUSTMENT

CT8, L8 SW2 FREQUENC COVERAGE ADJUSTMENT

L5 SW1 TRACKING ADJUSTMENT

CT3, L3 MW TRACKING ADJUSTMENT

+ 25 hidden pages

Sony CFS-828-S Service manual

TABLE OF CONTENTS

GENERAL

DISASSEMBLY

cabinet (rear) assy

POWER board

mechanism deck

DIAL POINTER SETTING

MECHANICAL ADJUSTMENTS

ELECTRICAL ADJUSTMENTS