TM 11-5840-281-12-1
4-32. TROUBLESHOOTING PROCEDURES. (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Blank crt on either control-indicator. (Cont)
If adjustment in 1 through 3 cannot be accomplished, replace 35V voltage
regulator card (para 4-39) and perform control-indicator power supply
adjustments (para 4-42).
Step 4.
Place BITE SELECT switch to - 12V position and observe indication on AZ TILT/BITE meter.
a. If meter indicates in green zone, proceed to step 5.
b. If no meter indication is obtained, replace 12V voltage regulator card (para
c.
If meter indicates other than green zone, adjust 12V voltage regulator card
as indicated in 1 through 3.
1. Set up multimeter to measure - 12 v.
2. Connect positive lead of multimeter to J616 DC RET and connect
negative lead to J615 BITE MON.
3. Adjust R1808 - 12V ADJ on 12V voltage regulator card for - 12V
indication on multimeter.
If adjustment in 1 through 3 above cannot be accomplished, replace 12V voltage
regulator card (para 4-39) and perform control-indicator power supply
adjustments (para 4-42).
Step 5.
Check all fuses in indicator power supply.
a. If any fuse is blown, momentarily turn off power and replace fuse. If new
fuse blows, refer to a higher category of maintenance.
b. If no fuses are blown, replace indicator rectifier card in control-indicator
power supply. If problem still persists, refer to a higher category of
maintenance.
3.
No radar video or weak radar video, and HV ON indicator switch on either control-indicator is illuminated.
Step 1.
Check that correct preselector filters are installed in receiver.
Install correct preselector filters (para 4-27).
4-108
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