Sencore VA62A Tech Tips

#114
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Learning To Use The VA62A Universal Video Analyzer
The VA62A Universal Video Analyzer provides
tests needed to isolate problems in any NTSC
TV receiver or video monitor. This Tech Tip
helps you become familiar with the VA62A by
working with each feature.
You will need the following:
1. Your VA62A with its instruction manual
and supplied cables.
2. An isolation transformer or the Sencore
PR57 "AC Powerite"
®
AC safety supply.
1. A GocXl
2. A PR57
3. The VA62A
4. The VA62A Cables
5. The VA62A Instruction Manual
6. The TV Service Manual
3. A TV receiver in good operating order.
When possible, use one with a digital tuner
and cable channels.
4. The schematic and service literature for
the TV receiver.
RF Signals Are Used Every Time
You need to understand the RF generators first.
You use these generators in three ways: 1) They
confirm that the tuners work correctly, 2) They
Fig. 1: Gather these Items before going through the information In this Tech Tip.
test the internal circuits without taking the back
off the set, and 3) They provide the reference
signal needed for signal substitution.
The VA62A has three RF generators: 1) Stan-
dard TV, 2) Standard Cable, and 3) Program-
mable Cable. The signals from all three genera-
tors are controlled by the RF-IF LEVEL switch
and the RF-IF LEVEL VERNIER control. For
most testing, the RF-IF LEVEL switch should be
in the "Hf" position.
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#114
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