NOTES ON CABINETS ASSEMBLYSAFETY CHECK-OUT
Put flat cable and wires between the cabinets and push them in the
grooves located at A to E in the figure to prevAfter corrent disconnectionecting the original service problem, perform the following
before assembling the set.safety check 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
Bdescribed 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.
AREAR CABINETC1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturersO instructions to use these
instruments.
D2. A battery-operated AC milliammeter. The Data Precision 245
E
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
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)
FRONT CABINET
To Exposed Metal
Parts on Set
AC
0.15mF1.5kW
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
� 3 � |
ACEC
SONY
