the AC power line. Use a transformer of adequate power rating as
this protects the technician from accidents resultingin personal
injury from electrical shocks. It will also protect Combination VCR
from being damaged by accidental shorting that may occur during
servicing.
3. When servicing, observe the original lead dress, especially the
lead dress in the high voltage circuits. If a short circuit is found,
replace all parts which have been overheated or damaged by the
short circuit.
4. After servicing, see to it that all the protective devices such as
insulation barriers, insulation papers, shield, and isolation R-C
combinations are properly installed.
5. Before turning the receiver on, measure the resistance between B+
line and chassis ground. Connect (-) side of an ohmmeter to the B
+ lines, and (+) side to chassis ground. Each line should have
more resistance than specified,as follows :
(For model with 13 inch CRT)
B+ Line
Minimum Resistance
130.0 V
1 k (Cold chassis ground)
23.5 V
180 (Cold chassis ground)
13.0 V
110 (Cold chassis ground)
(For model with 20 inch CRT)
B+ Line
Minimum Resistance
130.0 V
1 k (Cold chassis ground)
21.5 V
180 (Cold chassis ground)
15.9 V
3
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