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Page Title:
Table 3-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC- 92-Continued |
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|  TM 11-5820-873-34
Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued
STEP
ACTION
INDICATION
NEXT STEP
the Antenna Coupler antenna post and ground
post using a BNC/clip lead cable
12
Set mode switch to CPLR TUNE KW
COUPLER STATUS FAULT indicator illumi-
Yes: step 13
nates
No: step 130
13
WARNING
NOTE
Several kilovolts are present at the Antenna
If COUPLER STATUS READY indicator does
Coupler antenna post, E1, during steps 13 thru
not illuminate during this step, depress TUNE
14b Exercise caution and do not contact antenna
START once more If READY indicator illumi-
post E1.
nates after the second time, the indication is
good.
Depress TUNE START.
COUPLER STATUS FAULT indicator goes out
Yes: step 14a
and COUPLER STATUS TUNING indicator illu-
No: step 100
minates When the antenna coupler is tuned.
COUPLER STATUS TUNING Indicator goes out
and COUPLER STATUS READY indicator Illu-
minates
14a
Set frequency to 40 MHz. Set REFL FWD
Meter 1A2M1 indicates a refl power level
Yes: step 14b
POWER MONITOR switch to REFL
Depress
No: step 143
TUNE START and observe meter 1A2M1.
14b
Set REFL FWD POWER MONITOR switch to
Meter 1A2M1 indicates a fwd power level
Yes: step 15a
FWD. Set frequency to 12 995 MHz
Depress
No: step 143
TUNE START and observe meter 1A2M1.
15a
Set mode switch to OFF Connect DC power cord
Clear audio tone with minimal background noise
Yes: step 15b
to 1A8J3 Connect wattmeter and dummy load to
in speaker Wattmeter indicates 100W 10W
No: step114
ANT jack 1A8J1 Connect CW key to Key jack
1A1J4 Check DC fuse 1A6F3 for proper value
for 13 VDC operation. Check 1A6TB2 wiring for
13 VDC operation. refer to Operator and
Organizational Maintenance Manual TM
11-5820-873-12. Set 1A6A2-S1 for 13 VDC
operation Set mode switch to CW. Depress CW
key.
15b
Set mode switch to OFF Replace DC fuse with
Clear audio tone with minimal background noise
Yes step 16a
appropriate fuse for 26 VDC operation Rewire
heard in speaker Wattmeter indicates 100 W
No: step 132
1A6TB2 for 26 VDC operation, refer to Operator
10 W.
and Organizational Maintenance Manual TM
11-5820-873-12 Set 1A6A2-S1 for 26 VDC
operation Turn power on Depress CW key.
16a
Set mode switch to OFF Disconnect all external
Step 16b
cabling and test equipment.
16b
Reassemble Receiver-Transmitter RT-12771
Step 16c
URC-92.
16c
Ensure inverter is tagged properly for 26 VDC
Step 16d
operation.
16d
Receiver-Transmitter RT-1277/URC-92 check-
out is now complete Receiver-Transmitter is
operationally ready.
17
Check fuse 1A6F2
Fuse checks good
Yes: step 18
No: replace fuse
1A6F2
18
Connect multimeter between meter lamp center
Multimeter indicates + 12 VDC 0.8V
Yes: replace meter lamp
contact and ground
No: step 132
19
Check fuse 1A6F3
Fuse checks good
Yes: step 20
No: replace fuse
1A6F3
20
Connect multimeter between 1A1DS3 center con-
Multimeter indicates + 5 VDC 0.25 VDC
Yes: replace
tact and ground.
1A1DS3
No: step 132
21
Connect multimeter between 1AIDS1-1 center
Multimeter indicates + 12 VDC 0.8 VDC
Yes: replace
contact and ground.
1A1DS1
No: step 22
22
Connect multimeter between 1A3XJ5-B and
Multimeter indicates +12 VDC 0.8 VDC
Yes: step 23
ground
No: step 132%
23
Connect multimeter between 1A3XA4J4-14 and
Multimeter indicates + 12 VDC 0.8 VDC
Yes: step 24
ground
No: step 132
3-4
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