Sony ZSD-50 Service manual

ZS-D50

SERVICE MANUAL

Ver. 1.2 2005.09

TAPE Model Name Using Similar Mechanism NEW

Section Tape Transport Mechanism Type MF-ZSD50

Section

US Model

Canadian Model

Model Name Using Similar Mechanism ZS-M7

MD Mechanism Type CDM-2411AAA

Optical Pick-up Type DAX-11A

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION With 3-ohm loads, both channel driven from 150 - 8,000 Hz; rated 2 W per channel minimum RMS power, with no more than 10 % total harmonic distortion in AC operation.

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 / –1 dB

Wow and flutter

Below measurable limit

Radio section

Frequency range

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

Antennas

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

SPECIFICATIONS

Cassette-corder Section

Recording System

4-track 2 channel stereo

Fast winding time

Approx. 130 s (sec.) with Sony cassette C-60

Frequency response

TYPE I (normal) : 50 - 15,000 Hz

General

Speaker

Full range : 8 cm (3 1/4 in.) dia., 3 ohms, cone type x 2

Input

LINE IN jack (stereo minijack) Minimum input level 250 mV

Outputs

Headphones jack (stereo minijack)

For 16 - 68 ohms impedance headphones

LINE OUT jack (stereo minijack)

Rated output level 250 mV at load impedance 47 kilohms

OPTICAL DIGITAL OUT (CD) (optical output connector)

Wavelength : 630 - 690 nm

Power outputs (EXCEPT US model)

4.5 W + 4.5 W (at 3 ohm, 10% harmonic distortion)

– Continued on page 2 –

PERSONAL AUDIO SYSTEM

9-924-979-12

Sony Corporation

Personal Audio Group Published by Sony Engineering Corporation

Power requirements

For personal audio system : 120 V AC, 60 Hz 12 V DC, 8 size D (R20) batteries

For memory back-up : 6 V DC, 4 size AA (R6) batteries

For remote commander : 3 V DC, 2 size AA (R6) batteries

Power consumption

AC 25 W

Battery life

For personal audio system

FM recording

Sony R20P : approx. 6 h Sony alkaline LR20 : approx. 12 h

Tape playback

Sony R20P : approx. 3 h Sony alkaline LR20 : approx. 6 h

CD playback

Sony R20P : approx. 1.5 h Sony alkaline LR20 : approx. 3h

Dimensions (incl. projecting parts)

Approx. 435 x 223 x 160 mm (w / h / d)

(17 1/4 x 8 7/8 x 6 1/8 inches)

Mass (incl. batteries)

approx. 4.3 kg (9 lb. 7 oz)

Supplied accessories

AC power cord (1) Remote commander (1)

Design and specifications are subject to change without notice.

TABLE OF CONTENTS

Specifications ........................................................................... 1

1. SERVICE NOTE........................................................... 3

2. GENERAL ...................................................................... 4

3. DISASSEMBLY

3-1. “Cabinet, Rear”, “Cabinet Sub ASSY, Front” ............ 6

3-2. Inlet Board, Power Board ........................................... 7

3-3. Battery (R) Board, Battery (L) Board......................... 7

3-4. Cabinet (Upper) ASSY ............................................... 7

3-5. Switch (1) Board......................................................... 8

3-6. Mechanism Deck ........................................................ 8

3-7. Line Board .................................................................. 8

3-8. Tuner Board ................................................................ 8

3-9. CD Block ASSY ......................................................... 9

3-10. Headphone Board ..................................................... 9

3-11. Switch (2) Board, LCD Board, Lamp Board.......... 10

3-12. Main Board, CD/System Board.............................. 10

3-13. CD Block Section ....................................................11

3-14. TC RF Board, Head Relay Board,

Belt (FR/BR), Motor (M691)..................................11

3-15. Tray ASSY, CD....................................................... 12

3-16. Loading Board ........................................................ 12

3-17. Optical Pick-up Block, Pick-up Relay Board ......... 12

4. TEST MODE................................................................ 13

6. DIAGRAMS

6-1. Explanation of IC Terminals..................................... 18

6-2. Block Diagrams (Tape, Main Section) ..................... 20

6-3. Block Diagrams (Tuner, CD Section)....................... 23

6-4. Printed Wiring Boards (Main Section) ..................... 27

6-5. Schematic Diagram (Main Section) ......................... 31

6-6. Printed Wiring Boards (CD/System Section) ........... 36

6-7. Schematic Diagram (CD/System Section) ............... 41

6-8. Printed Wiring Boards (Tuner Section) .................... 46

6-9. Schematic Diagram (Tuner Section) ........................ 48

7. EXPLODED VIEWS

7-1. Rear Cabinet Section ................................................ 56

7-2. Front Cabinet Section ............................................... 57

7-3. CD Block Section ..................................................... 58

7-4. Mechanism Deck Section -1 ..................................... 59

7-5. Mechanism Deck Section -2 ..................................... 60

7-6. CD Section................................................................ 61

7-7. Optical Pick-up Section ............................................ 62

8. ELECTRICAL PARTS LIST ................................... 63

5. ADJUSTMENTS

5-1. Mechanical Adjustmens............................................ 14

5-2. Electrical Adjustments.............................................. 14

– 2 –

SAFETY CHECK-OUT (US Model)

SECTION 1

SER VICE NOTE

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 AC 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 0.5mA (500 microampers). 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 VOM or battery-operated AC voltmeter . The “limit” indication is 0.75V, 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)

To Exposed Metal Parts on Set

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 more than 30 cm away from the objective lens.

LASER DIODE AND FOCUS SEARCH OPERATION CHECK

1. Close the lid for CD.

2. Press CD ^ button.

3. Confirm the laser diode emission while observing the objecting lens. When there is no emission, Auto Power Control circuit or Optical Pick-up is broken. Objective lens moves up and down once for the focus search.

1.5k

0.15

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

Ω

Earth Ground

AC voltmeter (0.75V)

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 damaged by heat.

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.

CAUTION DURING WHEN MOUNTING THE PULLEY FOR THE LOADING MOTOR

Make the following adjustment when mounting the loading motor (part number : 1-698-999-11) and motor pulley (part number : 2627-174-01) of the CD section.

Specification : A = 0.9 to 1.1mm

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR 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.

– 3 –

LOCATION AND FUNCTION OF CONTROLS

FRONT PANEL : CD/RADIO/TAPE section

SECTION 2

GENERAL

1 Tape operation buttons

r/P (REC/REC P AUSE) 0, ) (FF/REW, AMS) p (STOP) “, ” (PLAY)

2 Cassette lid 3 6 PUSH OPEN/CLOSE 4 DIR MODE button 5 COUNTER RESET button

FRONT PANEL: TIMER/COM section

6 EDIT button 7 CANCEL button 8 6 CD OPEN/CLOSE button 9 CD tray !º CD operation buttons

=, + (AMS/SEARCH) ^ (PLAY/PAUSE) p (STOP)

!¡ Radio operation buttons

RADIO BAND PRESET +, –

!™ AUTO PRESET button !£ MODE MONO/ST ISS button

!¢ STANDBY button !∞ SLEEP button !§ OPR/BATT indicator !¶ POWER button !• Remote control receiver !ª Display window @º DISPLAY button @¡ VOL +, – @™ SOUND button

@£ MEGA BASS button @¢ ENTER/MEMORY CHECK button @∞ MD(LINE) button @§ Speaker @¶ 2 (Headphones) jack (stereo mini jack) @• TUNING TIME SET +, – button @ª TIMER button #º CLOCK button

– 4 –

REAR PANEL

#¡ Battery compartment #™ FM telescopic antenna #£ LINE IN jack #¢ LINE OUT jack #∞ OPTICAL DIGITAL OUT(CD) jack #§ AC IN ⁄ jack #¶ OPTICAL DIGITAL OUT(CD) jack cover socket

Remote commander

9 !º !¡

1 FUNCTION button

Each time you pressed, the function changes in the order CD – Tape – Radio – Line – CD

2 6 CD OPEN/CLOSE button 3 Number buttons 4 MODE button 5 Radio operation buttons

TUNE +, – button BAND

6 CD operation buttons

=, + (AMS/SEARCH) ( (PLAY) P (PAUSE) p (STOP)

7 Tape operation buttons

p (STOP) “, ” (PLAY) r/P (REC/REC P AUSE) 0, ) (FF/REW, AMS)

8 POWER button (AC only)

Active only when you use the set with AC power source.

9 MEGA BASS button !º VOL +, – button !¡ SOUND button

• • •

– 5 –

SECTION 3

DISASSEMBLY

The equipment can be remo ved using the f ollo wing pr ocedure .

< MAIN BLOCK SECTION >

Set

Cabinet, Rear

Cabinet sub ASSY, Front

Inlet board, Power board Battery (R) board, Battery (L) board

Cabinet (Upper) ASSY Switch (1) board Mechanism deck Line board Tuner board

CD block ASSY

Headphone board Main board CD block section

< MECHANISM DECK SECTION >

Mechanism deck

TC RF board, Head relay board, Belt (FR/BR), Motor (M691)

< CD BLOCK SECTION >

Tray ASSY, CD

Optical pick-up block, Pick-up relay board

CD block section

Loading board

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

3-1. “CABINET, REAR”, “CABINET SUB ASSY, FRONT”

Cabinet sub ASSY, Front

Telescopic antenna

Switch (2) board, LCD board, Lamp board

CD/System board

Screws (+BV 3X12)

Lid, Battery case

Handle

Screws (+BV 3X12)

Cabinet, Rear

– 6 –

3-2. INLET BOARD, POWER BOARD

)

Screws (+BV 3X10)

Power board

Screws

(+BV 3X10)

Inlet board

3-3. BATTERY (R) BOARD, BATTERY (L) BOARD

Claw

Cabinet, Rear

Battery (L) board

Bracket (2), Yok

Battery (R) board

3-4. CABINET (UPPER) ASSY

Cabinet (Upper) ASSY

Cabinet, Rear

Screws (+BV 3X10

Cabinet sub ASSY, Front

– 7 –

3-5. SWITCH (1) BOARD 3-6. MECHANISM DECK

)

Screws (+BV 3X8)

Cabinet (Upper) ASSY

Damper

Switch (1) board

3-7. LINE BOARD

Claw

Cabinet (Upper) ASS

Screws

(+BV 3X10)

Stopper, Wiring

Cabinet sub ASSY, Fron

Mechanism deck

Screw

(+BV 3X10

Plate, Upper

Screws

(+BV 3X10)

3-8. TUNER BOARD

Cabinet sub ASSY, Front

Line board

Bracket, Tuner

Claw

Screws (+BV 3X10)

Tuner board

Wire, Parallel (FFC) (10 core)

(Main board : CN305)

Screws (+BV 3X10

– 8 –

3-9. CD BLOCK ASSY

)

Cabinet sub ASSY, Front

Headphone board

Screw (+BV 3X10)

Wire, Parallel (FFC) (30 core)

(CD/System board : CN801)

CD block ASSY

Screws (+BV 3X10)

Wire, Parallel (FFC) (13 core

(CD/System board : CN803)

Screws (+BV 3X10)

Cabinet sub ASSY, Front

3-10. HEADPHONE BOARD

– 9 –

3-11. SWITCH (2) BOARD, LCD BOARD, LAMP BOARD

)

Lamp board

Remove solder

Bracket, CD button

Bracket (2), CD

LCD board

Switch (2) board

Screws (+P 2.6X6)

Screws (+BV 3X10)

Screws (+BVTP 2.6X10

3-12. MAIN BOARD, CD/SYSTEM BOARD

Screw (+BV 3X10)

Wire, Parallel (FFC) (21 core)

Bracket, CD

CD block section

Cabinet sub ASSY, Front

Main board

CD/System board

Wire, Parallel (FFC) (12 core)

Wire, Parallel (FFC) (20 core)

Screws (+BV 3X10)

– 10 –

3-13. CD BLOCK SECTION

Bracket, CD

Wire (Flat type) (21core)

CD block section

Screws (+BV 3X10)

<MECHANISM DECK SECTION> 3-14. TC RF BOARD, HEAD RELAY BOARD, BELT (FR/BR), MOTOR (M691)

Belt FR

Main board

CD/System boar

TC RF board

Screws

Remove solder

Screws

Motor (M691)

Belt BR

Screw

Head relay board

– 11 –

)

3-15. TRAY ASSY, CD

Screws

(+BV 3X10)

Cover (L), Side

Screws (+BV 3X10)

Plate (L), Side

Loading chassis

Plate (R), Side

Tray ASSY, CD

3-16. LOADING BOARD

Screws (+BV 3X10)

Slider (L)

Lid, CD

Wire, Parallel (FFC) (21 core)

(CD/System board : CN701)

Slider (R)

Screws

(+BV 3X10)

Cover (R), Side

3-17. OPTICAL PICK-UP BLOCK, PICK-UP RELAY BOARD

Tray (Top), CD

Screws

(+BV 3X10

Loading board

CD block section

Optical pick-up block

Claw

– 12 –

Screws (+B 2.6X8)

Wire, Parallel

(FFC) (21 core)

Pick-up relay boar

Claw

Tray (Bottom), CD

SECTION 4

TEST MODE

CD SECTION

1. Entering CD test mode

With the POWER button OFF, short JW801 and JW802 on the LCD board. (You need a moment for the short.) The LCD display changes as in the diagram and the unit goes into test mode.

MEGA BASS

When you press the ^ key, the CD rotates and when you press the ^ key again, the CD plays (the track servo comes on)(but no sound is issued). Pressing the ^ key starts automatic adjustment and the value changes, but this value is not a problem.

[LCD BOARD](Conductor side)

ALL

SOUND

3. RF LEVEL and jitter check

Test mode PLAY status

Connection P oint : CD/System board (Conductor side)

oscilloscope

(AC range)

TP (RFO)

TP (VC)

CD TEST MODE

SHORT : TEST MODE OPEN : NORMAL MODE

2. Exiting test mode

With the unit in test mode, when you press the POWER button to OFF, test mode ends.

Check to see that the jitter is less than 9.0 nsec. and RF level is between 0.55 – 0.85Vp-p.

VOLT/DIV : 200mV (using 10:1 probe) TIME/DIV : 500ns

RF level:

0.55–0.85 Vp-p

– 13 –

SECTION 5

ADJUSTMENTS

4. TRAVERSE SIGNAL check

Connection P oint : CD/System board (Conductor side)

oscilloscope

(AC range)

TP (TO)

TP (VC)

Press the FF or FR from 3. Check to see that the traverse signal level is between 200 to 400mVp-p.

Note:

Extend the sweep time for easier view.

200 – 400mVp-p

5-1. MECHANICAL ADJUSTMENTS

TAPE RECORDER SECTION

PRECAUTION

1. Clean the following parts with a denatured-alcohol-moistened swab :

record/playback/erase head pinch roller rubber belts capstan

2. Demagnetize the record/playback head with a head demagnetizer.

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

Torque Torque Meter Meter Reading

Forward CQ-102C

Forward Back Tension (0.028 to 0.083 oz • inch)

Reverse CQ-102RC

Reverse Back Tension (0.028 to 0.083 oz • inch)

FF/REW CQ-201B

CQ-102C

CQ-102RC

T ape Tension Measurement

Mode Tension Meter Meter Reading

FWD CQ-403A

REV CQ-403A

36 to 61 g • cm

(0.5 to 0.84 oz • inch)

2 to 6 g • cm

36 to 61 g • cm

(0.5 to 0.84 oz • inch)

2 to 6 g • cm

61 to 143 g • cm

(0.85 to 1.98 oz • inch)

more than 100g

(more than 3.53 oz)

more than 100g

(more than 3.53 oz)

A = B

5. RELEASE THE TEST MODE

After completed with adjustment, press the POWER button to release the test mode.

5-2. ELECTRICAL ADJUSTMENTS

TAPE RECORDER SECTION 0dB = 0.775V

1. The adjustnemts should be performed in the order in the service manual. (As a general rule playback circuit adjustment should be completed beforeming recording circuit adjustment.)

2. The adjustments should be performed for bothe L-CH and RCH unless otherwise indicated.

Standard Intput Level

Input terminal LINE IN

source impedance 10kΩ

input signal level 0.5V (–3.8dB)

Standard Output Level

Output terminal LINE OUT

load impedance 47kΩ

output signal level 0.5V (–3.8dB)

Test T ape

Type Signal Used for

P-4-A100 10kHz, –10dB Azimuth Adjustment WS-48B 3kHz, 0dB Tape Speed Adjustment

– 14 –

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