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Page Title:
Table 5-3. Troubleshooting Guide |
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|  TM 11-5820-918-13
Troubleshooting Guide
Indication
Location/Cause
Main line disconnected; fuse F1 (1024) blown;
1.
1024 Main Power pushbutton
transformer or lamp malfunction. Check
does not illuminate
position of switch S1, line selector. Over-
voltage crowbar tripped.
2.
Main line input disconnected; 4011 not on;
5018 Power indicator does not
fuse F1 (5018 or 4011) blown; contactor K1
illuminate
(in 4011) malfunction; transformer (in 5018 or
4011) or lamp malfunction; malfunction in 5018
voltage regulators A3 or U4; overvoltage crow-
bar in 4011 tripped.
Main line disconnected; fuse F1 (4011) blown;
3
4011 Main Power pushbutton
malfunction in FL1, T1, CR5, or lamp. Check
does not illuminate
position of switch S1, line selector. Over-
voltage crowbar tripped.
Defective or disconnected coax cabling; de-
4
No RF power indication.
fective meter; no output from 1024 unit, over-
heating in 5018 unit causes a thermal switch
to cutoff amplifier bias voltage; defective
5018 RF amplifier or power supply; defective
4011 filter set, RF relays, power detector, or
power supplies.
1024 not switched to full output; faulty 5018
5.
Low or incorrect RF power
power supply; defective meter movement; one
meter reading.
or more 5018 RF power amplifiers faulty;
defective input cables; faulty synthesizer in
1024; faulty 4011 filter set.
Defective fan; defective power supply; ambient
6.
Amplifier overheating.
air above specifications; obstructed fan intake
communications Tx on; faulty load resistor
connection.
7.
Numeric display stopped or
If frequency: Problem is synthesizer fre-
incorrect.
quency counter (1024) , or frequency standard,
Press TEST pushbutton to check synthesizer.
If time: Problem in programmer or frequency
standard. Check 1A2A1, TP3 (see figure 5-5)
(100 kHz).
8.
Excessive RF power variation
Faulty 4011 filter set, 4011 filter decode, or
versus frequency sweep.
5030 sweep synthesizer.
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