Sony CDP 270 Service Manual

Page 1

SERVICE MANUAL

US
Canadian
AEP

E

US
Canadian

AEP
UK
0 E

Model
Model
Model
Model

GDP-270
Model
Model
Model
Model
Model

GDP-470
SPECIFICATIONS
Frequency response 2Hz-20kHz (11 dB) TABLE OF CONTENTS
Signal-to-noise ratio More than 100dB
Dynamic range More than 90dB . '
Harmonic distortion l1kHz) Sect/on T/t/e Page
Less than 009%
Channel separation More than 95dB (1 kHz) Specifications ................. 1
Outputs 'LINE OUT (photo jacks) Features 2
Output level 2V (at 50kilohms) IIIIIIII . IIIIIIIIII
Load impedance over 10ki|ohrns Safety Check-Out """""""" 2
Servicing Note .................. 3
General
Power reqirements US, Canadian model: 120V AC, 60Hz
AEP model: 220v Ac, 50/60Hz SECTION 1 GENERAL
UK model: 240V AC, 50/60Hz 1-1. Location and Function of Controls . . 4
E model: 1107120V or 220-240V 1-2i Description on ICG (MSC6458) ....... 5
AC adjustable, 50/60Hz
Power consumption US, Canadian model: 12W
EXCEPT US, Canadian model: SECTION 2 ADJUSTMENTS """"" 7
low
Dimensions (approx. including projections) SECTION 3. DIAGRAMS
AEP. UK model: . 3-1. Semiconductor Lead Layouts ..... 10
43°X1°°X275mm 7X4X°'"°hesl 32. Printed Wiring Boards ......... 11
EXCEPT AEP,UK model: 3 3 S h t D' 13
430x95x275mm (17X3%x10inchesl * ° ema 1° , agmm ~ ' """"
Weight (approx') 35 kg (7 lbs 1201) 3-4. lC Block Diagrams ........... 16
3-5. Waveforms ......... . ..... 17
SECTION 4. EXPLODED VIEWS ....... 18
SECTION 5. ELECTRICAL PARTS LIST . i . 21
SUPPLEMENT-1 .................. 25

COMPACT DISC P

LAYER

()NY;

Page 2

GDP-270 70

FEATURES

- Three CUSTOM EDIT functions, convenient for tape

editing

- PROGRAM EDIT function for confirming the total
playing time while choosing the selection to be
programmed.

- TIME EDIT function for programming selections
automatically to fit in a desired duration.

-- TIME FADE function for stopping the play, fading out
at the desired time.

FADE-lN/FADE-OUT function for fading in or out the

play when starting or stopping.

SHUFFLE play for playing the selections in a random

order.

REPEAT function for a single selection. the whole disc,

PROGRAM play, or SHUFFLE play.

Easy-to-read display window shows the selection

number being played, all the numbers of the selections

on the disc (up to 16), the elapsed playing time, and the

remaining time.

o

0

SA FETY-R E LATED COMPONENT WARNING! I

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
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 PUB-
LISHED BY SONY.

ATTENTION AUCOMPOSANT AYANT RAPPORT
A LA SECURITE!

Les composmrs IDENTIFIES PAR uue MAROUE A
sun LES DIAGRAMMES SCHEMATIOUES er LA LISTE
DES PIECES sour cRIrioues Poun LA sécumré
DE FONCTlONNEMENT. NE REMPLACER ces com.
POSANTS due PAR DES PIECES sonv DONT Les
NUMéRos sour ooNNes DANS ce MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

SAFETY CH ECK-OUT

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 0.5 mA (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 instru-
ments.

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 volt-
meter. 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 2 V AC range are
suitable. (See Fig. A)

To Exposed Metal
Parts on Set

A C
0. 15MF g 1. 5kSZ / voltmeter
L (0. 75 v/

11-. Earth Ground

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