Сервисный мануал источника звука Sony ICF-C470

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TABLE OF CONTENTS
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DISASSEMBLY
.........................................................
DIAL POINTER SETTING
.....................................
POWER CORD SETTING
.....................................
ELECTRICAL ADJUSTMENTS
..........................
6-1. Block Diagram ................................................................
6-2. Printed Wiring Boards (ICF-C470) ................................ 116-3. Schematic Diagram (ICF-C470) ..................................... 136-4. Printed Wiring Boards (ICF-C470L) .............................. 156-5. Schematic Diagram (ICF-C470L) .................................. 17
EXPLODED VIEWS
................................................ 20
ELECTRICAL PARTS LIST
............................... 22
ATTENTION AU COMPOSANT AYANT RAPPORT
? LA S?CURIT?!
LES COMPOSANTS IDENTIFI?S PAR UNE MARQUE
SUR LES DIAGRAMMES SCH?MATIQUES ET LA LISTEDES PI?CES SONT CRITIQUES POUR LA S?CURIT?DE FONCTIONNEMENT. NE REMPLACER CES COM-POSANTS QUE PAR DES PI?CES SONY DONT LESNUM?ROS SONT DONN?S DANS CE MANUEL OUDANS LES SUPPL?MENTS PUBLI?S PAR SONY.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
OR DOTTED
LINE WITH MARK
ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFEOPERATION. REPLACE THESE COMPONENTS WITHSONY PARTS WHOSE PART NUMBERS APPEAR ASSHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-LISHED BY SONY.
HOW TO CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and CF3.You must used same type of color marked ceramic filters in orderto meet same specifications.Therefore, the ceramic filter must changed two pieces togethersince it's supply two pieces in one package as a spare parts.
Center frequency
Notes on chip component replacement
· Never reuse a disconnected chip component.· Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-ing 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 andfrom all exposed metal parts to any exposed metal part having areturn 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 theseinstruments.
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 voltmeter. The "limit" indica-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 batteryoperated digital multimeters that have a 2 V AC range are suit-able. (See Fig. A)
Using an AC voltmeter to check AC leakage.
ACvoltmeter(0.75 V)
To Exposed MetalParts on Set
Earth Ground