TB 9-6625-340-35
11. Power Supply
a. Performance Check
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
CAUTION
Make sure there is no connection between chassis ground of
digital voltmeter (A5) and TI.
(1) Adjust COMP ATTENUATOR control to 0.
(2) Disconnect thermistor mount from TI.
(3) Set POWER RANGE switch to 1.0 MW, 0 DBM and THERM RES switch to
100^.
(4) Insert adapter (B4) into J2 (fig. 1).
(5) Connect digital voltmeter negative terminal to TI chassis ground and positive
terminal to junction of R72 and R73 (fig. 1). If digital voltmeter does not indicate between -
2.475 and -2.525 V, perform b below.
b. Adjustments
(1) Remove adapter from J2 (fig. 1).
(2) Rotate COMP ATTENUATOR control fully ccw.
WARNING
There is a voltage of -225 V dc at junction of C1B and R14 (fig.
2). Exercise extreme caution when connecting digital voltmeter
to TI in (3) below.
(3) Connect digital voltmeter positive terminal to pin 7 of V5 and negative terminal
to junction of C1B and R14 (fig. 2).
(4) Adjust R13 (fig. 1) for a 50.0-V indication on digital voltmeter (R).
(5) Connect digital voltmeter positive terminal to pin 6 of V7 (fig. 2).
(6) Adjust R21 (fig. 1) for a 100.0-V indication on digital voltmeter (R).
(7) Repeat (3) through (6) above until no further adjustment is required.
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