TM 11-6625-3053-14
STEP
OPERATION
NORMAL INDICATION
CORRECTIVE ACTION
1
-325V BEAM SUPPLY VOLTAGE ALINEMENT
Deenergize sig gen.
Remove sig gen dust cover (para 6-20).
Set MODULATION switch to RF OFF.
Using multimeter, set to 1000 VDC range and energize. Set probes between instrument ground and -
325 volt test point on tracking board.
Reenergize sig gen.
Wait 2 mins before setting MODULATION switch to CW.
Voltage should read -325 VDC +/- 10 VDC.
Adjust AR18 for a beam volt-age
of -325 VDC.
Troubleshooting item 7.
Go to alinement step 2.
2
-750 VOLT SUPPLY ALINEMENT
Deenergize sig gen.
Remove instrument dust cover if on (para 6-20).
Set MODULATION switch to RF OFF.
Using multimeter, set to 1000 VDC range and energize. Set neg probe at -325V test point and
pos probe at -750V test point on tracking board.
Energize sig gen.
Wait 2 mins before setting MODULATION switch to CW.
Voltage should read -425 VDC +/- 10 VDC.
Adjust R9 on A2A1 circuit card for a reading
of -425 VDC.
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