Sony icf c 160 service manual

Page 2

SECTION 1
SERVICING NOTE

SAFETY CHECK-OUT

After correcting the original servme problem, perform the fol-
lowmg safety check before releastng the set to the customer
Check the antenna terminals, metal trim, metalllzed 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.

1. A commeTCial leakage tester, such as the Simpson 229 or RCA
WT-540A Follow the manufacturers Instructions to use these
instruments

2. A battery-operated AC milharnmeter The Data Prec1s10n 245
digital multimeter is snitable for this Job

3 Measuring the voltage drop across a resmtor by means of a
VOM or battery-operated AC voltmeter. The limit Indlca-
tIon is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multtrneters that have a 2 V AC range are
snitable. (See Fig. A)

To Exposed Metal
Paris on Set

AC
/ voltmeter
(0 75 V)

I é 1.5m

L;
3- Earth Ground

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

0.15 uF

Note on chip component replacement

0 Never reuse a disconnected chip component

a Notice that the minus side of a tantalum capacitor may be dam~
aged by heat.

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A OR DOTI'ED
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.

HOW TO CHANGE THE FM CERAMIC FILTERS
This model is used two ceramic filters of CFl and CPS.

You must use same type of color marked ceramic filters in Unit
to meet same speCifications.

Therefore, the ceramic filter must change two pieces together $112K
it's supply two pieces in one package as a spare parts

k2 Center
mar Mark 1 Mark 2 fretunC
CF3
mark 1 red _ 10 70Ml-I.
mark 2 § blue - 10 67MB
mange _ 10 73MH.
black - lO 64MH.
CF1

Wm ,- 1076Ml-L
white white 10 75 MH

yellow - 10 79 MH

CORD DRESSING

(POWER, ANTENNA)

1) Connect the power cord and antenna cord as shown In th
figure

2) Mount the cord stopper With screws (P3 x 10)
Note Tighten completely the screws (P3 x 10)

antenna card

power con:

cord stopper

screw
(P3X 10)

ATTEN110N AUCOMPOSANT AYANT RAPPORT
A LA SECURITEI

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A.
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CES cOM-
POSANTS OUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.