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Power supply circuit operation
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Test Set Mark 127 MOD 4
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Battery voltage test



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MILT-21369C(OS)
b. Connect the positive terminal of the vacuum tube voltmeter specified by 4.7a to the positive
(+) jack P6 and the negative (-) terminal of the voltmeter to the negative (-) jack P7. Both jacks
arc located in the chassis.
c. Set the ON-OFF switch at ON. The voltmeter shall indicate 510
10.
d. Set the ON-OFF switch at OFF.
e. Remove the voltmeter.
4.8.2.2 Operation of timing delay circuits. The tests of 4.8.221 and 4.8-222 shall be
and
After the timing delay circuits have been
performed at a temperature between
calibrated in accordance with 3.5.2 the panel-chassis assembly shall be removed from the case,
energized and allowed to warm up for 15 minutes before beginning the tests.
4.8.2.2.1 Five-second timing delay circuit.
Procedures 4.8.2.2.1a through 4.8.2.2.1j shall be
performed in sequence.
-
a. Set the ON-OFF switch at ON.
b. Set the TEST SELECTOR switch at 1.
c. If the HOME lamp is not lit, depress and hold the ADVANCE switch until the HOME lamp
lights.
d. Set the ON-OFF switch at OFF.
e. Connect a jumper across the VOLTAGE and LEAKAGE meter terminals. This jumper
must be as short as possible and make positive electric contacts with both meter terminals.
f. Connect the electric timer specified by 4.7b to pins B and C of the 3-pin Adapter Cables
connector.
g. Set the ON-OFF switch at ON.
h. Set the TEST SELECTOR switch at position 2.
0.25 seconds.
i. Momentarily depress the START switch The timer shall run for 5
j. Disconnect the electric timer from the 3-pin ADAPTER CABLE connector.

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