Sony cfs b 11 service manual

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TABLE OF CONTENTS

i n m we
SAFETY CHECK-OUT ............................................ 2
GENERAL ................................................................ 4
DISASSEMBLY ....................................................... 5
MECHANICAL ADJUSTMENTS ............................. e
ELECTRICAL ADJUSTMENTS ............................... 6

DIAGRAMS (Made in INDONESIA)
Printed Wiring Board - Tuner Section -
Schematic Diagram - Tuner Section -
Semiconductor Lead Layouts ..........
Printed Wiring Board - Audio Section -
Schematic Diagram - Audio Section -.

10
12

EXPLODED VIEWS
Front Cabinet ..
Rear Cabinet ..
Mechanism Deck Block (1)
Mechanism Deck Biock (2) ..

ELECTRICAL PARTS LIST
(Made in INDONESIA) ............................................ 21

DIAGRAMS (Made in CHINA)

Printed Wiring Board - Tuner Section --
Schematic Diagram - Tuner Section - 26
Printed Wiring Board - Audio Section - . 28
Schematic Diagram - Audio Section -- ........................... 31

25

ELECTRICAL PARTS LIST
(Made in CHINA) ..................................................... 33

SAFETY-RELATED COMPONENT WARNING I!

COMPONENTS IDENTIFIED BY MARK A 0R DOT'I'ED

LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL T0 SAFE 0P-

ERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

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.

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

A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for this job.

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

AC
voitmeter
(0.75V)

0.15m:

gtsm /
'._J

-_-L Earth Ground

F7

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

ATTENTION Au COMPOSANT AYANT RAPPORT

A LA SECURITEII
LES COMPOSANTS IDENTIFIES PAR UNE
MAROUE A sun LES DIAGRAMMES
SCHEMATIOUES ET LA LISTE DES PIECES SONT
CRITIOUES Poun LA sEcunITE DE
FONcTIONNEIIIENT. NE REMPLACER cES
COMPOSANTS OUE PAR DES PIECES SONY
DONT LEs NuMEnos SONT DONNES DANS cE
MANUEL ou DANS LES SUPPLEMENTS PUBLIES
PAR SONY.