Sony CDP C90ES Service Manual

Page 2

CDP-C90ES/C91O

SAF ETY 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 05 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-54OA. 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 an Set

ac
0.15: g 1.5km / voltmeter
L (0. 75 w

"7 Earth Ground

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

SAFETY-RELATED COMPONENT WARNINGII

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.

TABLE OF CONTENTS

Section Title Pixie;
SECTION I. GENERAL ------------- 3
SECTION 2. SWITCH AND SENSOR OPERATIONS - - - - 4
SECTION 3. MECHANICAL ADJUSTMENTS ------- 5
SECTION 4. ELECTRICAL BLOCK CHECKING ----- 7
SECTION 5. DIAGRAMS
5-1. Printed Wiring Boards --------- 9
5-2. Schematic Diagram 7 MAIN Section v ' 13
5-3. Schematic Diagram 7 80 Section 7 - - 18
5L4_ WAVEFORMS ............... 23
SECTION 6. EXPLODED VIEWS
6-1. Front Panel Assembly Section ----- 24
6-2. Chassis Assembly Section ------- 25
6-3. MD Section-I ------------- 25
6-4. MD Section-2 ------------- 27
5-5. Optical Pick-Up Block Section ----- 28
SECTION 7. ELECTRICAL PARTS LIST -------- 29

MODEL IDENTIFICATION

(Specuhcarion Label) CDP»CB l 0

CDP-CSOES

SONYO

COMPACT DISK PLAYER

MODEL N0. Em

US, Canadian model: AC: |20V 60Hz |5W

: C: 2201230V~50/60Hz
: C: IIO-IZIJV, 220-230V~50/60Hz l5W
Australian model: AC: 240V~50/60Hz

ATTENTION AUCOMPOSANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER css COM-
POSANTS QUE PAR DES PIECES souv DONT LES
NUMEROS SONT DONNES DANS c: MANUEL ou
DANs LES SUPPLEMENTS PUBLIES PAR SONY.