Sony SA-VA15 - Model Identification; Back Panel Identification; Safety Check-out Procedures; AC Leakage Check

MODEL IDENTIFICATION
— BACK PANEL —
4-974-284-0001 : US Model
4-974-284-100 : CND Model
4-974-284-2001 : AEP, G Model
4-974-284-30 : UK Model
* For detailed SP, MY, CH model
of refer to AEP model
* For detailed AUS model of refer
to UK model
Note:
* Abbreviation
CND : Canadian model.
G : German model.
SP __: Singapore model.
MY =: Malaysia model.
AUS : Australian model.
CH : Chinese model.
SAFETY CHECK-OUT
After correcting the original service problem, perform
the following safety checks 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
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). 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 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
“limit” indication is 0.75 V, so analog meters must
have an accurate low-voltage scale. The Simpson 250
and Sanwa SH-63Trd are examples of a passive VOM
that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable.
(See Fig. A)
To Exposed Metal
Parts on Set
AC
ra] voltmeter
(0.75V)
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.