TM 11-5840-281-12-1
4-32. TROUBLESHOOTING PROCEDURES. (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check MAGNETRON CURRENT meter on transmitter control panel and observe magnetron current is
9.5 + 1 ma in narrow pulse operation and 27.5 + 5.5 ma in wide pulse operation.
If magnetron current is not within above tolerances, refer to a higher category of
maintenance.
4.
No radar video and HV ON indicator switch on either control-indicator is not illuminated.
On transmitter control panel, press OVLD RESET switch. On master control-indicator, place TRANSMITTER
switch to NAR or WIDE position and press HV ON indicators switch.
If HV ON indicator switch does not light, refer to a higher category of maintenance.
5.
No radar video and HV ON indicator switch on either control-indicator is not illuminated. Antennas do not scan or
scan erratically.
Step 1.
On local control monitor, place LOCAL/REMOTE switch to RT position and place MONITOR switch to
+ 35V position. Observe MONITOR meter indication.
a. If meter indicates + 35 v, proceed to step 2.
b. If meter indicates 0 v, replace 35V voltage regulator card (para 4-39) and
perform receiver-transmitter power supply adjustments (para 4-41).
c.
If meter indicates other than + 35 v, adjust 35V voltage regulator card as
Indicated in 1 through 3.
1.
Set up multimeter to measure + 35 v.
2.
Connect positive lead of multimeter to J5303 VOLTAGE MON and
connect negative lead to J5304 GND on local control monitor.
3.
Adjust R3414 + 35V ADJ on 35V voltage regulator card for
multimeter indication of + 35 v.
If adjustment in 1 through 3 cannot be accomplished, replace 35V voltage
regulator card (para 4-39) and perform receiver-transmitter power supply
adjustments (para 4-41).
4-109
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