M/NTSC B/PAL U6-4 Voltage
2 E2, E3 .35 Volts
3E4.45Volts
4.62Volts
5.75Volts
6.85Volts
7E5.45Volts
8E6.55Volts
9E7.62Volts
10 .70 Volts
11 E8 .77 Volts
12 E9 .85 Volts
13 E10-E12 .95 Volts
Using a test load with low VSWR, measure the DC voltage of
the forward sample at the feed through to the logic printed wiring
or at junction of R5 and C4 for reference.
At the reflected sample feedthrough or at the anode of CR1 inject
aDC voltage. Slowlyincreasethevoltageuntilthemodulefaults.
It should trip at a voltage 0.84 times the reference +/-10%.
To adjust the trip threshold set the injected voltage to 0.84 times the
forward reference and adjust R101 until the module faults off.
This accounts for the 6 dB pad on the forward sample line and
scales the trip point to be the equivalent of 2.5:1 VSWR.
Appendix A - RF Amplifier Modules
10-16-95 (888-2365-001) (888-2377-001) (888-2378-001) A-17
WARNING: Disconnect primary power prior to servcing.
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