Quantcast Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) - TM-11-5820-873-340066

 

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Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) - TM-11-5820-873-340065
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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-11-5820-873-340067


TM 11-5820-873-34
Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92--Continued
STEP
ACTION
INDICATION
NEXT STEP
212
Check switch 1A1S8-D, rear, and 1A1R23 thru R33.
Components check good.
Yes: step 213
No: replace faulty compo-
nent.
213
Check switch 1A1S10-13, rear, and 1A1R34 thru R44.
Components check good.
Yes: step 214
No: replace faulty compo-
nent.
214
Check switch 1A1S15.
Switch checks good.
Yes: step 285
No: replace switch
1A1S15
215
Connect multimeter across 1A1DS2 contacts.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: replace 1A1DS2
No: step 216
216
Set mode switch to OFF.  Remove front panel.
Check
Continuity checks good.
Yes: step 285
continuity between 1A1R52, pins A and B.
No: replace VFO control
1A1R52.
217
Connect multimeter between synthesizer mother board 1A4A6-J
Multimeter indicates + 7.6 VDC 0.8 V.
Yes: step 217
and ground. Rotate VFO control.
No: step 221
218
Connect multimeter between Translator CCA, 1A4XA3-A and
Multimeter indicates + 7.6 VDC 0.8 V.
Yes: step 219
ground Rotate VFO control.
No: step 221
219
Connect multimeter between 1A4A6-8 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 220
No: step 285
220
Connect multimeter between 1A4XA3-1 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 222
No: step 297
221
Check VFO control 1A1R52.
Component checks good.
Yes: step 285
No: replace VFO control
1A1R52.
222
Adjust 1A4A3-L22 for a multimeter indication of 7.6 VDC 0.8
L22 adjusts within tolerance.
Yes: step 6d
VDC.
No: step 299
223
Check relay 1A1K101 and diode 1A1CR17.
Components check good.
Yes: step 224
No: replace faulty compo-
nent.
224
Check FREQ CONTROL switch 1A1S15.
Component checks good.
Yes: step 285
No: replace switch
1A1S15
225
Set signal generator to 0 dB. Connect oscilloscope probe to
Oscilloscope displays waveform similar to Fig. 4-2L.
Yes: step 226
1A3XA2J2-5.
No: step 230
226
Connect oscilloscope probe to 1A3XA4J4-11, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2M.
Yes: step 227
ground.
No: step 232
227
Connect multimeter between 1A3XA4J4-9 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 228
No: step 287
228
Connect multimeter between 1A3XA4J4-13 and ground.
Multimeter indicates between + 2.0 VDC and + 8.0
Yes: step 229
VDC.
No: step 290
229
Connect VTVM (AC) to 1A3XA4J4-6, ground lead to ground.
VTVM indicates 0.1 V minimum.
Yes: step 290
No: step 187
230
Connect frequency counter to 1A5A4-E1, ground lead to
Frequency counter indicates 29.9994 MHz.
Yes: step 231
ground.
No: step 292
231
Connect frequency counter to 1A3XA1J1-15, ground lead to
Frequency counter indicates 29.9994 MHz.
Yes: step 233
ground.
No: step 234
232
Connect oscilloscope probe to 1A3XA2J2-11, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2M.
Yes: step 287
ground.
No: step 236
233
Connect multimeter between 1A3XA1J1-3 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 235
No: step 239
234
Connect frequency counter to 1A3A5-E22, ground lead to
Frequency counter indicates 29.9994 MHz.
Yes: step 287
ground.
No: step 285
235
Connect multimeter between 1A3XA1J1-P and ground.
Multimeter indicates between + 2.0 VDC and + 8.0
Yes: step 298
VDC.
No: step 287
236
Connect multimeter between 1A3XA2J2-9 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 237
No: step 287
237
Connect multimeter between 1A3XA2J2-3 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 238
No: step 287
238
Connect multimeter between 1A3XA2-P and ground.
Multimeter indicates between + 2.0 VDC + 0.8 VDC.
Yes: step 295
No: step 287
239
Connect multimeter between 1A3A5-E1 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 287
No: step 241
240
Connect multimeter between mode switch, 1A1S13-2 and
Meter indicates + 12 VDC 0.8 VDC.
Yes: step 285
ground.
No: replace 1A1S13.
4-18


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