Sony icf c 425 service manual

Page 1

lCF-C420 C425

SERVICE MANUAL Canadian Model

AEP Model
E Model
Australian Model

lCF-C420

Germany Model
Italian Model

IC F-C425

Photo : [OF-C425 (Black Type)

TABLE OF CONTENTS
m m 1:852
specifications ..................................................................... 3
Features ............................................................................ 3
1. GENERAL ................................................................. 3
2. ELECTRICAL ADJUSTMENTS ----------------------------------- 6

3. DIAL POINTER SETTING
3-1. Dial Pointer Setting ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7

4. DIAGRAMS

4-1, Printed Wiring Board .......................................... 9
42. SChematic Diagram ............................................ 11
5. EXPLODED VIEW ..................................................... 13
6. ELECTRICAL PARTS LIST ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 14

FM/AM DIGITAL CLOCK RADIO
SONY;

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ICF-C420/ C425

SAFETY CHECK-OUT (US Model)

After correcting the original serw'ce 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 0.5 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-S40A. 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-
meter. The limit" indication is 0.75V, 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)

MODEL IDENTIFICATION
- Model Number Label -

SONY: Monstuo ICF-C420
FM/AM 2 BANDS

SONY. MODEL NO. ICF-C425

FM/AM 2 BANDS

l::*

To Exposed Metal
Parts on Set

AC
0.751.= $1.5 k0 / voltmeter
I0. 75 V)

TTL" Earth Ground

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

Canadian, E92 Model : AC120V

::J- AEPV E91 Model :

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 AVANr RAPPORT
A LA SECURITE!

LES COMPOSANTS mmrmés PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES sour CRITIQUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER css COMA
POSANTS ous PAR DES PIECES sonv DONT LES
NUMEROS sonr DONNES' DANS CE MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

60H: 3W

AC220V-230V 50Hz 3W
AUS Model : AC240V~50H2 3W

Germany. IT Model : AC220~230V 50H: 3W