Sony tc ka 3 es service manual

Page 2

TABLE OF CONTENTS
Sermon I'LtLe Bags
SECTION 1. GENERAL ................................................... 3

SECTION 2. DISASSEMBLY

2-1. Mechanism Deck .................................
2-2. Cassette Holder
243. Ornamental Plate.
2-4. Pinch Lever and Lever (FR) .
2-5. Comparator Board, capstan Board and FG Board.
2-6. MD Board ..............................................................
2-7. Fieel Motor Board .............................................................

menarche»

\1

SECTION 3. MECHANICAL ADJUSTMENTS ................ 7
SECTION 4. ELECTRICAL ADJUSTMENTS ................. 10

SECTION 5. DIAGRAMS
5-1. IC Pin Functions

- |0801 M38172M4-133FP

- l0851 M38122M2-0698P
5-2. Circuit Boards Location .....
5-3. Block Diagram ...................................
5-4. Primed Wiring Board - Audio Section -
5-5. Schematic Diagram - Audio Section - .
5-6. Primed Wiring Board - System Control Section -
5-7. Schematic Diagram

- System Control (1/2) Section - ................................. 35
5-8. Schematic Diagram

- System Control (2/2) Section -.
5-9. IC Block Diagrams ........................

SECTION 6. EXPLODED VIEWS
6-1. Front Panel Section
6-2. Chassis Section
6-3. Mechanism Section 1 (TCM-2OOD15) .
64. Mechanism Section 2 (TCM-2OOD15) .

SECTION 7. ELECTRICAL PARTS LIST .......................... 48

Dolby noise reduction and HX

Pro headroom extension

' manufactured under license from
Dolby Laboratories Licensing
Corporation. HX Pro originated
by Bang 6: Olufsen.
DOLBY, the double-D symbol
DD and HX PRO" are
trademarks of Dolby Laboratories
Licensing Corporation.

Notes on chip component replacement

- Never reuse a disconnected chip component.

- Notice that the minus side of a tantalum capacitor may be
damaged by heat.

SAFETY CHECK-OUT

After correcting the original service problem, perform
the following safety checks 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

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 instruments.

2. A battery-operated AC miiiiammeter. 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 voltmeter. 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 3 2V AC range are suitable. (See
Fig. A)

To Exposed Metal
Parts on Set

I AC
015? < 15m / voltmeter

. (0.75V)

:- Earth Ground

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

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
PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA sEcuniTEu
LEs COMPOSANTS tDENTIFIEs PAR UNE MAROUE A
sun LEs DIAGRAMMES SCHEMATIOUES ET LA LISTE
oEs PIECES sour CRITIQUES POUR LA sEcuniTE
DE FONCTIONNEMENT. NE REMPLACER ces
COMPOSANTS QUE PAR DES PIEcEs som DONT
LES NUMEnos SONT DONNES DANS CE MANUEL ou
DANS LEs SUPPLEMENTS PUBLIEs PAR som.

...2_