Sony excd 31 service manual

Page 1

EXCD-31

SERVICE MANUAL

US Model

Canadian Model

AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
7 watts per Channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than
1 % total harmonic distortion.

CD player section

System

Signal-to- noise ratio
Frequency response
Wow and flutter
Laser Diode Properties
Material
Wavelength
Emission Duration
Lasci- output power

Compact disc digital audio

system

90 d B

10 - 20,000 Hz

Below measurable limit

CaAlAs

780 nm
Continuous

Less than 44.6 uW

This nuipm is the valiw measured at n distmrcv o] 20!)
mm from Ihv ulnjcctivc lens surface an the Optical Pick»

up Block.

Tuner section

_ FM

Tuning range

Antenm terminal
intermediate frequency
Usable sensitivity
Selectivity
Signal-to-noise ratio

87.5 - 107.9 MHz

External antenna connector
107 MHz

13 dBf

70 dB at 400 kHz

65 dB (stereo),

68 dB (mono)

Model Name Using Similar Mechanism NEW

CD Drive Mechanism Type MG-333X-121

Optical Pick-Up Name KSS-520A
SPECIFICATIONS

Harmonic distortion at I kHz General
05 % (stereo), Output lead
0.3 % (mono)

Separation 33 dB at I kHz

Frequency response 30 - 15,000 Hz Tone controls

Capture ratio 2 dB
A M

Tuning range

Antenna terminal
intermediate frequency
Sensitivity

Power requirements

530 - 1,710 kHz

External antenna connector
450 kHz

32 uv

Dimensions

Mounting dimension

Power amplifier section
Mass

Out uts S eaker out uts . ,
P (gm ml mimmrs) Supplied accessories
Speaker impedance 4 - 8 ohms

Maximum power output 20 W x 4 (at 4 ohms)

Iower antenna cmilrol/
Power amplifier control
lead

Bass :10 dB at 100 Hz
Treble :ll) dB at it) kHz

12 v DC carboltcry
(negative ground)

Approx. 188 x 58 x l80 mm
(7 /:x2><7 /h in.)
(w/h/d)

Approx. 183 x 53 x158 mm
(7 /¢x2 Vixe /4 in.)
(w/h/d)

Approx. 1.3 kg (2 lb 14 oz.)
Parts for installation and
connections (1 set)

Front panel case (i)

Destgn and specifications m subject to change without

naticc.

FM/AM COMPACT msc PLAYER
S ONE

Page 2

TABLE OF CONTENTS

1. GENERAL

Location of Controls ..................................................... 3

Installation . 4

Connections 5
2. DISASSEMBLY ......................................................... 7
3. TEST MODE ............................................................. 11
4. ELECTRICAL ADJUSTMENTS

Tuner Section .................................................................. 11

CD Section ...................................................................... 13
5. DIAGRAMS
5-1. IC Pin Function Description .. . 14
52. Printed Wiring Boards

- Mechanism Deck Section -- ......................................... 16
5-3, Schematic Diagram - Mechanism Deck Section . 19
5-4. Schematic Diagram - Main, Display Section - ..
5-5. Printed Wiring Boards - Main, Display Section - ....... 27
6. EXPLODED VIEWS ................................................ 33
7. ELECTRICAL PARTS LIST ............................... 38

ADDITIONAL
INFORMATION

SE

SERVICING NOTES

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

The laser diode in the optical pick-up block may suffer elec-
trostatic breakdown because of the potential difference gen-
erated 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.

Laser Diode Properites

~ Material: GaAlAs

- Wavelength: 780 nm

0 Emission Duration: continuous

. Laser Output Power: less than 44.6 uW*

* This output is the value measured at a distance of 200mm

from the objective lens surface on the Optical Pickup
Block.

CAUTION

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

SAFETY-RELATED COMPONENT WARNINGH

COMPONENTS IDENTIFIED BY MARK A OR DO'ITED
LINE WITH MARK A 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
PUBUSHED BY SONY.

Flexible Circuit Board Repairing

- Keep the temperature of the soldering iron around 270 °C
during repairing.

0 Do not touch the soldering iron on the same conductor of
the circuit board (within 3 timw).

0 Be careful not to apply force on the conductor when solder~
ing or unsoldering.

Notes on chip component replacement

0 Never reuse a disconnected chip component.
0 Notice that the minus side of a tantalum capacitor may be
damaged by heat,

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IDENTIFIES PAR UNE MARQUE A
SUR LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL OU DANS
LES SUPPLEMENTS PUBLIES PAR SONY.