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Page Title:
Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) |
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|  TM 11-5820-873-34
Table 4-2.
Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92--Continued
STEP
ACTION
INDICATION
NEXT STEP
12
Set mode switch to CPLR TUNE KW.
COUPLER STATUS FAULT indicator
Yes: step 13
No: step 265
13
WARNING
NOTE
Several kilovolts are present at the Antenna Coupler antenna
If COUPLER STATUS READY indicator does not
post, E1, during steps 13 thru 14b. Exercise caution and do not
illuminate during this step, depress TUNE START
contact antenna post E1.
once more. If COUPLER STATUS READY indicator
illuminates after the second time, the indication is
good.
Depress TUNE START.
COUPLER STATUS FAULT indicator goes out and
Yes: step 14a
COUPLER STATUS TUNING indicator illuminates.
No: 266
When the antenna coupler is tuned, COUPLER
STATUS TUNING indicator goes out and COUPLER
STATUS READY indicator illuminates.
14a
Set frequency to 4.0 MHz.
Set REFL FWD POWER
Meter 1A2M1 indicates a refl power level.
Yes: step 14b
MONITOR switch to REFL. Depress TUNE START and
No: step 272
observe meter 1A2M1.
14b
Set REFL FWD POWER MONITOR switch to FWD. Set
Meter 1A2M1 indicates a fwd power level.
Yes: step 15a
frequency to 12.995 MHz. Depress TUNE START and
No: step 274
observe meter 1A2M1.
15a
Set mode switch to OFF Connect DC power cord to 1A8J3.
Clear audio tone with minimal background noise in
Yes: step 15b
Connect wattmeter and dummy load to ANT jack 1A8J1.
speaker. Wattmeter indicates 100 W 10 W.
No: step 277
Connect CW key to Key jack 1A1J4. Check DC fuse 1A8F3 for
proper value for 13 VDC operation. Check 1A6TB2 wiring for
13 VDC operation, refer to Operator and Organizational
Maintenance Manual TM 11-5820873-12. Set 1A6A2-S1 for 13
VDC operation. Set mode switch to CW Depress CW key.
15b
Set mode switch to OFF. Replace DC fuse 1A8F3 with
Clear audio tone with minimal background noise heard
Yes: step 16a
appropriate fuse for 26 VDC operation. Rewire 1A6TB2 for 26
in speaker. Wattmeter indicates 100 W 10 W.
No: step 303
VDC operation., refer to
Operator and Organizational
Maintenance Manual TM 11-5820-873-12 Set 1A6A2-S1 for 26
VDC operation. Depress CW key. Set mode switch to CW.
16a
Set mode switch to OFF.
Disconnect all external
Step 16b
cabling and test equipment.
16b
Reassemble Receiver-Transmitter RT-1277/ URC-92.
Step 16c
16c
Ensure inverter is tagged properly for 26 VDC
Step 16d
operation.
16d
Recelver-Transmltter RT-1277/URC-92 checkout is now
NOTE
---
complete. Receiver-Transmitter is operationally ready.
For location of parts see figures 4-22 thru 4-66.
17
Connect multimeter between 1A6P1, pins 1 and 3, then
Multimeter indicates 115 VAC 15%
Yes: step 18
between pins 5 and 7.
No: step 21
18
Connect multimeter between 1A6XA1-B and Ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 19
No: step 23
19
Connect multimeter between 1A1S16-8 and
Ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 20
No: step 25
20
Connect multimeter between meter lamp center
contact and
Multimeter Indicates + 12 VDC 0.8 V.
Yes: replace meter lamp.
ground.
No: step 285
21
Disconnect AC power cord. Remove 1A8F1 and 1A8F2 from
Fuses check good.
Yes step 22
No:
replace
faulty
rear panel. Check fuses 1ASF1 and 1A8F2.
component.
22
Check 1A1S13C, front, and 1A1S13B, rear.
Switch checks good.
Yes : step 285
No: replace 1A1S13
23
Connect multimeter between 1A6XA1-C and ground.
Multimeter indicates + 20 VAC 1.5 VAC.
Yes: step 24
No: step 27
24
Check transistor Q102.
Q102 checks good.
Yes: step 25
No: replace transistor
Q102
25
Set mode switch to OFF. Check fuse 1A6F2.
Fuse Checks good.
Yes: step 290
No: replace fuse 1A6F2
4-4
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