Sony tc wr 99 es service manual

Page 2

TC - WR99 ES/W R990

TABLE OF CONTENTS
Section Title Page
Specification .......................................... 1
Model Identification .................................. 2
Safety Check-out .................................... 2
1. GENERAL
Identifying the Parts ........................... . 3
Hook-up Example ................................... 4
2. DISASSEMBLY ....................................... 5
3. ADJUSTMENTS
8-1. Mechanical Adjustment ~~~~~~~~~~~~~~~~~~~~~ 8
3-2. Electrical Adjustment ~~~~~~~~~~~~~~~~~~~~~~ 8
4. DIAGRAMS
4- 1. Block Diagram .............................. , 12
4-1-1. Circuit Boards Location ~~~~~~~~~~~~~~ 15
4-2. Printed Wiring Boards --------------------- 16
4-3, Schematic Diagram ......................... 21
4-4. Semiconductor Lead Layouts ~~~~~~~~~~~~~~~ 24
5. EXPLODED VIEWS ................................ 29
6. ELECTRICAL PARTS LIST .......................... 33

MODEL IDENTIFICATION

- Specification Label - TC - WR99 ES

TC- WR990

MODEL No. 7//////////l

STEREO CASSETTE DECK

7////////////////////////////%,,

SERIAL N0.
MADE IN JAPAN

US, Canadian Model: AC: 120V 60Hz 30W
AEP Model : AC: 220 - 230~50l60Hz

E Model : AC: 120, 220, 240V~50/60Hz30W

SAFETY-RELATED COMPONENT WARNING

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
SONV PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB«
LISHED BY SONI.

_2_

SAFETY CH EC K-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 microampersl Leakage
current can be measured by any one of three
methods.

l. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers instructions to use these instru-
ments.

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 0.7SV, 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

A C
voltmeter
(0. 75 v/

0.15M Eggs/(s1
L.._l

'7" faith Ground

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

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS memmés PAR UNE MAROUE A
SUR LES DIAGRAMMES scHEMATmUEs Er LA uer
DES PIECES sour cmrrouss POUR LA sEcuané
DE FONCTIONNEMENT. NE REMPLACER ces coM-
POSANTS QUE PAR DES PiEcEs sonv DONT LES
NUMEROS SONT DONNEs DANS CE MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.