POWER SUPPLY A1A5 ALIGNMENT

TM 11-5820-919-40-2

POWER SUPPLY A1A5 ALIGNMENT

The alignment procedure is to be used in either of these situations: (1) the performance test calls a potentlometer out of adjustment,

or (2) one of the following is replaced:

1. Timers U1. U2

2. Switching Regulators U3, U4

3. Diode VR1

4. Capacitors C6, C7

The procedure consists of a preliminary setup and an adjustment procedure.

PRELIMINARY SETUP

ADJUSTMENT

1. Remove the synthesizer and the power supply from the

1. Monitor the voltage at TP7 of the module and adjust

receiver/exciter.

R24 to obtain +6.50v.

2. Plug the power supply (unit to be aligned) into the test

2. Monitor the voltage at TP6 of the module and adjust

bed radio.

R17 to obtain +12.50v.

3. Except for the keying adapter sad watt meter, connect

3. Turn the radio off and disconnect the test equipment.

the test radio, cables, adapters and test equipment as shown in

figure 7-3. Set the do power supply (7 amp) to +26.5v.

4. Set the following test radio controls as follows:

FREQUENCY KHz to 29,990.0

SB to USB

ANT/SEL to 50 OHM (bypass)

MODE to V-TR

VOLUME to on

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