Sony tc k 650es service manual

Page 2

TC-K620/K650ES

MODEL IDENTIFICATION
- Specification Label -

TC-K620
TC-KSSOES

SONY® MODEL NO. V///////////A
STEREO CASSETTE DECK

SERIAL Nor
MADE IN JAPAN

US, Canadian Models: AC: 120V 60Hz 17W
AEP, West Germany Model: AC: 220 V~50l60 Hz

UK Model: AC: 240 V~50 Hz
E Model: AC: 120, 220, 240 V~
50/60 HZ 17W
TABLE OF CONTENTS
Section M Page
specificatiofls .................................. 1
Model Identification ............................ 2
Safety Check Out ........................ 2
1. GENERAL .............................. 3
2_ DISASSEMBLY .................. 4
3. ADJUSTMENTS 7
4. DIAGRAMS
4.1 Printed Wiring Boards ..................... 13
4-2. Schematic Diagram - Audio Section - ----- 17
4-3. Schematic Diagram
- System Control Section - ~~~~~~~~~~~~~~~ 20

5. EXPLODED VIEWS .................... 23
6. ELECTRICAL PARTS LIST ----------- 27

SAFETY-RELATED COMPONENT WARNING! l

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 SECURITEI

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LEs DIAGRAMMES SCHEMATIOUES ET LA LISTE
oEs PIECES SONT CRITIQUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER ces coM-
PosANTs QUE PAR DES PIECES so~v DONT LES
NUMEROS SONT DONNés DANS cs 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 05 mA (500 microampers). Leakage
current can be measured by any one of three
methods.

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S4OA. 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-

lhe limit" indication is 0.75V, so

analog meters must have an accurate low-

voltage scale. The Simpson 250 and Sanwa

SH-63'I'rd 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)

meter.

To Exposed Metal
Parts on Set

r
élfikfl /
L.

A C
voltmeter

0. 15 uF
(a, 75 VI

Earth Ground

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