HCD-EP707
Notes on chip component replacement
CAUTION
YNever reuse a disconnected chip component.Use of controls or adjustments or performance of procedures
Y Notice that the minus side of a tantalum capacitor may be dam-
other than those specified herein may result in hazardous ra-
aged by heat.diation exposure.
Flexible Circuit Board Repairing
YKeep the temperature of the soldering iron around 270 uC dur-SAFETY CHECK-OUT
ing repairing.After correcting the original service problem, perform the follow-
Y Do not touch the soldering iron on the same conductor of theing safety check before releasing the set to the customer:
circuit board (within 3 times).Check the antenna terminals, metal trim, Ometallized� knobs,
Y Be careful not to apply force on the conductor when solderingscrews, and all other exposed metal parts for AC leakage.
or unsoldering.Check leakage as described below.
This appliance is classified as a CLASS 1 LASER product.
LEAKAGE TEST
The CLASS 1 LASER PRODUCT MARKING is located onThe AC leakage from any exposed metal part to earth ground and
the bottom.from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
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 manufacturersO instructions to use these
instruments.
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 Olimit� 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 battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
To Exposed Metal
Parts on Set
AC
0.15 ?F1.5 k&voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
ATTENTION AU COMPOSANT AYANT RAPPORT
SAFETY-RELATED COMPONENT WARNING!!� LA S?CURIT?!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTEDLES COMPOSANTS IDENTIFI?S PAR UNE MARQUE 0
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMSSUR LES DIAGRAMMES SCH?MATIQUES ET LA LISTE
AND IN THE PARTS LIST ARE CRITICAL TO SAFEDES PIéCES SONT CRITIQUES POUR LA S?CURIT?
OPERATION. REPLACE THESE COMPONENTS WITHDE FONCTIONNEMENT. NE REMPLACER CES COM-
SONY PARTS WHOSE PART NUMBERS APPEAR ASPOSANTS QUE PAR DES PIéCES SONY DONT LES
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-NUM?ROS SONT DONN?S DANS CE MANUEL OU
LISHED BY SONY.DANS LES SUPPL?MENTS PUBLI?S PAR SONY.
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ACEC
SONY
