Sony CFD-S38 Service Manual

CFD-S38

SERVICE MANUAL

Ver 1.1 1999. 04

Section

US Model

Canadian Model

E Model

Model Name Using Similar Mechanism NEW CD Mechanism Type KSM-213CDM Optical Pick-up Name KSS-213C Model Name Using Similar Mechanism CFD-V10 T ape Transport Mechanism T ype MF-V10-117

AUDIO POWER SPECIFICATIONS (US Model)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION With 6-ohm loads, both channels driven from 100 - 10,000 Hz; rated 4 W per channelminimum RMS power, with no more than 10% total harmonic distortion in AC operation.

Other Specifications CD player section

System

Compact disc digital audio system

Laser diode properties

Material: GaAlAs Wave length: 780 nm Emission duration: Continuous Laser output: Less than 44.6 µW (This output is the value measured at a distance of about 200 mm from the objective lens surface on the optical pick-up block with 7 mm aperture.)

Spindle speed

200 r/min (rpm) to 500 r/min (rpm) (CLV)

Number of channels

Frequency response

20 - 20,000 Hz +1/–2 dB

Wow and flutter

Below measurable limit

SPECIFICATIONS

Radio section

Frequency range

FM: 87.6 - 108 MHz AM: 530 - 1,710 kHz

Aerials

FM: Telescopic aerial AM: Built-in ferrite bar aerial

Cassette-corder section

Recording system

4-track 2 channel stereo

Fast winding time

Approx. 120 sec. with Sony cassette C-60

Frequency response

TYPE I (normal): 70 - 13,000 Hz

General

Speaker

Full range: 10 cm (4 in.) dia., 6 ohms, cone type (2)

Outputs

Headphones jack (stereo minijack) For 16 - 68 ohms impedance headphones

– Continued on next page –

MICROFILM

CD RADIO CASSETTE-CORDER

– 1 –

Power requirements

For CD radio cassette-corder: 120 V AC, 60 Hz 9 V DC, 6 size D (R20) batteries For memory back-up: 6 V DC, 4 size AA (R6) batteries For remote control: 3 V DC, 2 size AA (R6) batteries

Power consumption

AC 25 W

Battery life

For CD radio cassette-corder:

FM recording

Sony R20P: approx. 3.5 h Sony alkaline LR20: approx. 10 h

Tape playback

Sony R20P: approx. 1.5 h Sony alkaline LR20: approx. 5 h

CD playback

Sony R20P: approx. 1 h Sony alkaline LR20: approx. 4 h

Dimensions

Approx. 420 × 156 × 262 mm (w/h/d)

5/8 × 6 1/4 × 10 3/8 inches) (incl. projecting parts)

(16

Mass

Approx. 4.7 kg (10 lb. 6 oz.) (incl. batteries)

Supplied accessories

AC power cord (1) Remote control RMT-CS38A (1) (Except Singapore model) Remote control RMT-CS38AD (1) (Singapore model)

Design and specifications are subject to change without notice.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270˚C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

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.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic breakdown and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.

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 P ARTS WHOSE P ART NUMBERS APPEAR AS SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

À LA SÉCURITÉ!!

– 2 –

SAFETY CHECK-OUT

TABLE OF CONTENTS

After correcting the original service problem, perform the following safety check before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for A C leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a V OM or battery-operated A C v oltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

1. SERVICING NOTES......................................................... 4

2. GENERAL

Playing a CD ........................................................................... 5

Listening to the radio............................................................... 5

Playing a tape .......................................................................... 6

Recording on a tape ................................................................. 6

3. DISASSEMBLY

3-1. Lid, Battery Case................................................................. 7

3-2. Cabinet Assy, Front .............................................................7

3-3. Wires ...................................................................................8

3-4. Transformer, Power .............................................................8

3-5. Antenna, Telescopic ............................................................ 9

3-6. Tuner Board......................................................................... 9

3-7. Cabinet (Upper) Assy........................................................ 10

3-8. Main Board ....................................................................... 10

3-9. CD Mechanism Block ....................................................... 11

3-10. Tape Mechanism Block ..................................................... 11

4. MECHANICAL ADJUSTMENTS............................... 12

5. ELECTRICAL ADJUSTMENTS

Tape Section .......................................................................... 12

Tuner Section......................................................................... 13

CD Section ............................................................................ 14

To Exposed Metal Parts on Set

0.15µF

1.5k

Ω

Earth Ground

AC voltmeter (0.75V)

Fig. A. Using an AC voltmeter to check AC leakage.

6. DIAGRAMS

6-1. IC Pin Description............................................................. 15

6-2. Circuit Boards Location .................................................... 16

6-3. Block Diagram – CD Section –......................................... 17

6-4. Block Diagram – Main Section –...................................... 19

6-5. Schematic Diagram – Tuner Section –.............................. 21

6-6. Printed Wiring Board – Tuner Section – ........................... 23

6-7. Printed Wiring Board – Control Section – ........................ 24

6-8. Printed Wiring Boards – Main Section – .......................... 25

6-9. Schematic Diagram – Main Section (1/3) – ...................... 27

6-10. Schematic Diagram – Main Section (2/3) – ...................... 29

6-11. Schematic Diagram – Main Section (3/3) – ...................... 31

6-12. Printed Wiring Boards – Power Supply Section – ............ 33

6-13. Schematic Diagram – Power Supply Section –................. 35

7. EXPLODED VIEWS

7-1. Front Cabinet Section........................................................ 40

7-2. Cabinet (Rear) Section ...................................................... 41

7-3. Cabinet (Upper) Section.................................................... 42

7-4. Tape Mechanism Section-1 ............................................... 43

7-5. Tape Mechanism Section-2 ............................................... 44

7-6. Optical Pick-up Section .................................................... 45

8. ELECTRICAL PARTS LIST......................................... 46

– 3 –

SECTION 1

SERVICING NOTES

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the lid (CD), use Chuck Plate Jig.

• Code number of Chuck Plate Jig: X-4918-255-1

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

1. Turn ON the POWER button and press FUNCTION button to CD position.

2. Open the lid (CD).

3. Turn on S501 with screwdriver, etc. as f ollowing figure.

4. Press the CD ﬂ button.

5. Confirm the laser diode emission while observing the objecting lens. When there is no emission, Auto P o wer Control circuit or Optical Pick-up is broken. Objective lens moves up and down three times for focus search.

S501

– 4 –

SECTION 2

GENERAL

This section is extracted from instruction manual.

– 5 –

– 6 –

SECTION 3

DISASSEMBLY

• The equipment can be removed using the following procedure.

Set

Lid, battery case

Cabinet assy, front

Wires Transformer,

power

Antenna, telescopic

Cabinet (upper) assy

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

3-1. LID, BATTERY CASE

screws +BVTP 3x10

Tuner board

lid, battery case

Main board

screws +BVTP 3x1

CD mechanism block

Tape mechanism block

3-2. CABINET ASSY, FRONT

cabinet assy, front

CNP307

– 7 –

CNP502

3-3. WIRES

)

Put flat cable and wires between the cabinets and push them in the grooves located at A to F in the figure to prevent disconnection before assembling the set.

FRONT CABINE

3-4. TRANSFORMER, POWER

CABINET (REAR

screws +BVTP 3x10

CNP901

transformer, power

CNP902

– 8 –

3-5. ANTENNA, TELESCOPIC

antenna, telescopic

screw +B 3x8

3-6. TUNER BOARD

tuner retainer board

screw +BVTP 3x10

KH2

KH1

TUNER board

– 9 –

3-7. CABINET (UPPER) ASSY

screw +BVTP 3x10

screws +BVTP 3x10

holder assy, cassette

screws +BVTP 3x10

lid (CD)

screw +BVTP 3x10

!¡

cabinet (upper) assy

!™

handle

3-8. MAIN BOARD

CNP901

screws +BVTP 3x10

connector

CNP902

KH1

KH2

CNP301

screws +BVTP 3x1

MAIN board

CNP305

CNP304

wire (flat type) (16 core)

– 10 –

3-9. CD MECHANISM BLOCK

screws (2.6x10)

CD mechanism block

3-10. TAPE MECHANISM BLOCK

screws +BVTP 3x10

tape mechanism block

screw +BVTP 3x1

– 11 –

)

SECTION 4

MECHANICAL ADJUSTMENTS

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 magnetizer 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

FWD CQ-102C

FWD Back Tension (0.021 – 0.076 oz • inch)

FF CQ-201B

REW CQ-201B

CQ-102C

30 – 70 g • cm

(0.42 – 0.97 oz • inch)

1.5 – 5.5 g • cm

more than 60 g • cm

(more than 0.83 oz • inch)

more than 60 g • cm

(more than 0.83 oz • inch)

TAPE SECTION 0 dB = 0.775 V

• 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

T ape Speed Adjustment

Procedure:

Mode: playback

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

set

jack (J301

digital frequency counter

Ω

T ape Tension Measurement

Mode Tension meter Meter Reading

FWD CQ-403A

more than 100 g

(more than 3.53 oz)

Adjust so that the value on the digital frequency counter is 3,000 Hz.

Specification Value:

Digital frequency counter

2,910 to 3,090 Hz

Adjust so that the frequency at the beginning and that at the end of tape winding are between 2,910 to 3,090 Hz.

Adjustment Location:

Tape speed adjustment control inside motor

– 12 –

)

TUNER SECTION 0 dB = 1 µV

3.0 ± 1.0 mm

L3 AM FERRITE-ROD ANTENNA

• FM Section

Setting:

RADIO (BAND) button: FM

FM RF signal generator

TP (FM ANT)

0.01

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

• AM Section

Setting:

RADIO (BAND) button: AM

AM RF signal generator

30% amplitude modulation by 400 Hz signal

• Connecting Level Meter (FM and AM)

Put the lead-wire antenna close to the set.

set

FM FREQUENCY COVERAGE

ADJUSTMENT

Frequency Display 87.5 MHz 108 MHz Reading on Digital voltmeter 1.6 ± 0.4 V 4.0 ± 0.1V Adjustment Part <confirmation> L2

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 CT1

87.5 MHz 108 MHz

AM FREQUENCY COVERAGE

CHECK

Frequency Display 530 kHz 1,710 kHz

Reading on Digital voltmeter 1.0

– 0.5 V – 0.6 V

+ 0.7 V

4.8

+ 1.2V

Adjustment Part <confirmation> <confirmation>

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 CT3

620 kHz 1,400 kHz

• For AM adjustment, fix the ferrite-rod antenna (L3) as shown below and then perform tracking adjustment at L4 and CT3. Lastly check the voltage.

level meter (range: 0.5–5 V ac

Ω

set

jack (J301)

• Connecting Digital Voltmeter (FM and AM)

digital voltmeter

100 k

Ω

TP (VT) (JW17)

• 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: See page 14.

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