SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, Ometallized� knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
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). Leak-
age 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.
CAUTION
Use of controls or adjustments or performance of procedures3. Measuring the voltage drop across a resistor by means of a VOM
other than those specified herein may result in hazardous ra-or battery-operated AC voltmeter. The Olimit� indication is 0.75
diation exposure.V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
Notes on chip component replacement
multimeters that have a 2V AC range are suitable. (See Fig. A)
Y Never reuse a disconnected chip component.
Y Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Parts on Set
Flexible Circuit Board Repairing
Y Keep the temperature of soldering iron around 270uC
during repairing.
Y Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
AC
Y Be careful not to apply force on the conductor when soldering0.15mF1.5kWvoltmeter
or unsoldering.(0.75V)
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
Earth Ground
This appliance is classified asFig. A. Using an AC voltmeter to check AC leakage.
a CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on
the rear exterior.
This caution
label is located
inside the unit.
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 SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
� LA S?CURIT?!!
LES COMPOSANTS IDENTIFI?S PAR UNE MARQUE ! SUR
LES DIAGRAMMES SCH?MATIQUES ET LA LISTE DES
PIéCES SONT CRITIQUES POUR LA S?CURIT? DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIéCES SONY DONT LES NUM?ROS
SONT DONN?S DANS CE MANUEL OU DANS LES
SUPPL?MENTS PUBLI?S PAR SONY.
� 2 � |
ACEC
