TM 11-6625-3053-14
ITEM
MALFUNCTION
CHECKS/CORRECTIVE ACTION
If voltage is not obtained, go to check 10 below.
If voltage is obtained, replace Q1.
10. AR3 check.
a) Continuing with multimeter as set, measure voltage between
ground and pin 4 or 8 of AR3.
Voltage should be approx 15 VDC in steady state CW operation,
and .5 VDC in RF OFF before delay activates.
If voltage obtained, replace AR3.
14
Low Attenuator Output.
1. Remove instrument dust cover if on.
2. Disconnect J4 from P4.
3. Using multimeter, set to the 100 ohm resistance range.
4. Measure resistance between the outer pin of P4 and ground.
Resistance should be between 45 and 55 ohms.
If resistance is not within these limits, replace ATTEN- UATOR
probe.
5. Repeat Alinement step 7.
15
1. Square Wave output check on A3 card assy.
a) Remove instrument cover (para 6-20).
b) Set up sig gen initial settings of para 2-4.
c) Swing A3 ckt card up counter clockwise to vertical position until
locked in place by stop located on A3 mtg bracket.
d) Make set up as in Square Wave Electrical. Check step 8.
e) Set Freq Counter power on. Energize sig gen and wait 2 mins.
f)
Set MODULATION Switch to INT SQ WAVE.
g) Center Square Wave rate control.
h) Using multimeter, set to 100 VAC range. Measure voltage
between ground and pin 20 of P4.
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