HCD-CP333
Notes on chip component replacementSAFETY CHECK-OUT
YNever reuse a disconnected chip component.After correcting the original service problem, perform the following
Y Notice that the minus side of a tantalum capacitor may be dam-safety check before releasing the set to the customer:
aged by heat.Check the antenna terminals, metal trim, Ometallized� knobs, screws,
and all other exposed metal parts for AC leakage.
Flexible Circuit Board RepairingCheck leakage as described below.
YKeep the temperature of the soldering iron around 270 uC dur-
ing repairing.LEAKAGE TEST
Y Do not touch the soldering iron on the same conductor of theThe AC leakage from any exposed metal part to earth ground and
circuit board (within 3 times).from all exposed metal parts to any exposed metal part having a
Y Be careful not to apply force on the conductor when solderingreturn to chassis, must not exceed 0.5 mA (500 microamperes.).
or unsoldering.Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
CAUTIONWT-540A. Follow the manufacturersO instructions to use these
Use of controls or adjustments or performance of proceduresinstruments.
other than those specified herein may result in hazardous
radiation exposure.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� indication is 0.75
This appliance is classified as a CLASS 1 LASER product.V, so analog meters must have an accurate low-voltage scale.
The CLASS 1 LASER PRODUCT MARKING is located onThe Simpson 250 and Sanwa SH-63Trd are examples of a
the rear exterior.passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
AC
0.15 ?F1.5 k&voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!!ATTENTION AU COMPOSANT AYANT RAPPORT
� LA S?CURIT?!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITHLES COMPOSANTS IDENTIF?S PAR UNE MARQUE 0 SUR LES
MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTSDIAGRAMMES SCH?MATIQUES ET LA LISTE DES PIéCES SONT
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESECRITIQUES POUR LA S?CURIT? DE FONCTIONNEMENT. NE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERSREMPLACER CES COMPOSANTS QUE PAR DES PIéSES SONY
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTSDONT LES NUM?ROS SONT DONN?S DANS CE MANUEL OU
PUBLISHED BY SONY.DANS LES SUPP?MENTS PUBLI?S PAR SONY.
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ACEC
SONY
