Sony TC-K555ES - SAFETY CHECKS AND MODEL IDENTIFICATION; AC Leakage Testing Procedures

SAFETY CHECK-OUT (US Model)
After correcting the original service problem,
perform the following 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
TC-K555ES
3. Measuring the voltage drop across a resistor by
means
of a YOM or battery-operated AC volt-
meter. 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 YOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
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 rnA (500 microampers). Leakage
current can be measured by anyone of three
methods.
I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers' instructions to use these instru-
ments.
2. A
battery-operated AC milliammeter. The Data
Precision 245 digital
multimeter is suitable for
this
job.
To Exposed Metal
Parts
on Set
1.5kH
..L Earth Ground
AC
voltmeter
(0.75 V)
MODEL IDENTIFICATION
- Specification Label -
SON~ MODEL NO. TC-K555ES
TAPECORDER
SERIAL NO.
MADE IN JAPAN
US, Canadian model: AC 120 V 60 Hz 26 W
Fig. A. Using an AC voltmeter to check AC leakage.
SON~ MODEL NO. TC-K555ES
TAPECORDER
SERIAL NO.
MADE IN JAPAN
AEP model: AC 220 V ~ 50/60 Hz 26 W
UK model: AC 240 V ~ 50/60 Hz 26 W
E model: AC 110, 120, 220, 240 V
~ 50/60 Hz 26 W
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