Servicing Notes - Sony SAVA-500 Service Manual

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MODEL IDENTIFICATION
– Rear view –
MODEL
US model
Canadian model
EXCEPT US, Canadian models
05/28/2012
SECTION 1

SERVICING NOTES

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 and
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
2. A battery-operated AC milliammeter. The Data Precision 245
3. Measuring the voltage drop across a resistor by means of a
PART No.
PART No.
4-217-252-3
4-217-252-4
4-217-252-5
WT-540A. Follow the manufacturers' instructions to use these
instruments.
digital multimeter is suitable for this job.
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 battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
To Exposed Metal
Parts on Set
0.15 µ F 1.5 k Ω
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
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AC
voltmeter
(0.75 V)
3