Quantcast Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) - TM-11-5820-873-340067

 

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Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) - TM-11-5820-873-340066
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) - TM-11-5820-873-340068


TM 11-5820-873-34
Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92--Continued
STEP
ACTION
INDICATION
NEXT STEP
241
Check relay 1A8K1.
Relay checks good.
Yes: step 285
No: replace relay 1A8K1.
242
Connect  multimeter  between  1A3A5-E5  and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 243
ground.
No: step 246
243
Set signal generator to 0 dB and 100% modulation.
Oscilloscope displays waveform similar to Fig. 4-2L.
Yes: step 244
Connect oscilloscope probe to 1A4XA113, ground
No: step 247
lead to ground.
244
Connect multimeter between 1A4A6-E16 and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 245
ground.
No: step 285
245
Connect  multimeter  between  1A4XA1-L  and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 296
ground.
No: step 297
246
Check relay 1A8K1.
Relay checks good.
Yes: step 285
No: replace relay 1A8K1
247
Connect oscilloscope probe to 1A3XA2-11, ground
Oscilloscope displays waveform similar to Fig. 4-2M.
Yes: step 248
lead to ground.
No: step 249
248
Connect  multimeter  between  1A3XA4-7  and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 290
ground.
No: step 287
249
Connect  multimeter  between  1A3XA2-7  and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 295
ground.
No: step 287
250
Connect multimeter to Speaker Driver CCA
Multimeter indicates + 28 VDC 1.5 VDC.
Yes: step 291
1A1A1-E1.
No: step 251
251
Connect multimeter between 1A6A1-8 and ground.
Multimeter indicates + 40 VDC 1.5 VDC.
Yes: step 252
No: step 253
252
Connect multimeter between 1A6A1-9 and ground.
NOTE
If no, set mode switch to OFF. Walt approximately 15
seconds then set mode switch to LSB and repeat step. If
still no, go to step 263.
Yes: step 255
Multimeter indicates + 28 VDC 1.5 VDC.
No: step 263
253
Check 1A6Q101 and 1A6R2.
Components check good.
Yes: step 285
No: replace faulty
component.
254
Connect multimeter between junction of 1A6CR1
Multimeter indicates 46 VAC or more
Yes: step 255
and 1A6CR3 and the junction of 1A6CR2 and
No: Replace transformer
1A6CR4.
1A6T1.
255
Check fuse 1A6F1.
Fuse checks good.
Yes: step 261
No: step 256
256
Check component 1A6Q101.
Component checks good.
Yes: step 257
No: replace transistor
1A6Q101; and replace
fuse 1A6F1.
257
Connect  multimeter  between  1A6XA1-J  and
Multimeter indicates between 450 ohms and 650 ohms.
Yes: step 258
ground.
No: step 259
258
Remove Regulator Board 1A6A1.
Connect
Multimeter indicates 850 ohms or more.
Yes: replace fuse 1A6F1
multimeter on 1A6A1 between 1A6A1-E and
No: replace fuse 1A6F1
1A6A1-R.
and go to step 286
259
Remove  Regulator  Board  1A6A  Connect
Meter indicates between 450 ohms and 850 ohms.
Yes: replace fuse 1A6F1
multimeter between 1A6XA1-J and ground.
No: step 260
260
Check component 1A6Q104.
Component checks good.
Yes: replace fuse 1A6F1
and go to step 285.
No: replace 1A6Q104; and
replace fuse 1A6F1.
261
Check  diodes
1A6CR1,
1A6CR2,
1A6CR3,
Diodes check good.
Yes: step 262
1A6CR4.
No: replace faulty
component.
262
Check components 1A6R1, 1A6C5, and 1A6C6.
Components check good.
Yes: step 285
No: replace faulty compo-
nent.
263
Check transistor 1A6Q101 and resistor 1A6R2.
1A6Q101 and 1A6R2 check good.
Yes: step 286
No: replace faulty compo-
nent.
264
Set mode switch to OFF.  Remove ANTENNA
Components check good.
Yes: step 285
COUPLER CONTROL (para.  3-12).  Check
No: replace faulty compo-
components 1A2R1, 1A2R2 and 1A2R3.
nent.
4-19


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