TM 11-6625-3053-14
ITEM
MALFUNCTION
CHECKS/CORRECTIVE ACTION
15
Voltage should be approx 11.6 VAC.
(cont'd)
i)
Observe frequency displayed on counter.
Frequency should be approx 1000 Hz +/- 50 Hz.
j)
If result of check h or i above is incorrect, go to check 2 below.
If results are correct, go to check 5 below.
2. CR7/Q1 check.
a)
Continuing with multimeter as set, measure voltage on pin 14 of
AR2.
Voltage should be approx 11.8 VDC.
If voltage obtained, replace Q1.
If voltage is not obtained, go to check 3 below.
3. AR2 check.
a) Continuing with multimeter as set, measure voltage at pin 11 of
AR2.
Voltage should be approx 11.3 VDC.
If voltage obtained, replace AR2.
If voltage is not obtained, go to check 4 below.
4. AR1 check.
a) Continuing with multimeter as set, measure voltage between
ground and pin 4 or 8 of AR1.
Voltage should be approx 11.8 VDC.
If voltage obtained, replace AR 1.
If voltage is not obtained, check power input to A3 card assy per
T/S item 12, check 1.e.
5. Repeat Alinement step 10 to set center Sq Wave frequency.
If square wave is not present at RF OUTPUT, check wiring
between pin 20 of P4 and E2 of the A5 Leveling Attenuator Assy.
If wiring is good, then check RF cable between E2 of the A5 assy
and RF OUTPUT Jack. If cable is good, replace A5 assy.
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