Sony TC-WR690 - Default Chapter; Table of Contents

SAFETY CHECK-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 0.5mA (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 instru-
ments.
tJ
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 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
(0.75 V)
0.15 uF 1SKQ
Using an AC voltmeter to check AC leakage.
Earth Ground
TC-WR690/WR790
TABLE OF CONTENTS
Section Title
GENERAL
2. DISASSEMBLY
2-1. Cassette Lid Assy
2-2. Front Panel Assy
2-3. Mechanism Deck
2-4,
2-5,
2-6. Head, Pinch Roller
3. MECHANICAL ADJUSTMENTS................
4. ELECTRICAL ADJUSTMENTS
5. DIAGRAMS
5-1.
5-2,
5-3.
5-4,
5-5.
5-6.
Circuit Boards Location
Semiconductor Lead Layouts
Printed Wiring Boards
Schematic Diagram— Audio Section—
Schematic Diagram—MD Section—
6. EXPLODED VIEWS
6-1. Cabinet Section
6-2. Front Panel Section
6-3.
6-4.
Mechanism Section (1)
Mechanism Section (2)
7. ELECTRICAL PARTS LIST
’ 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
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQUE /\
SUR LES DIAGRAMMES SCHEMATIQUES 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.
. Identifying the Parts.......... ccc eee cece eens
SS 2
CS
Capstan Motor, Reel Motor (1) ..................
Capsten Motor, Reel Motor (2) ...............00.
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SS 2
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Schematic Diagram—System Control Section—...
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