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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
1A4A6J1-P to 11A4XA2J2-N
1A4A6J1-14 to 11A4XA2J2-S
1A4A6J1-9 to 1A4XA2J2-14
1A4A6J1-K to 1A4XA2J2-15
1A4A6J1-R to 1A4XA2J2-R
202
Continuity check the following:
Continuity checks good.
Yes: step 302
1A4A6J1-4 to 1A4XA4-7
No: step 297
1A4A6J1-D to 1A4XA4-8
1A4A6J1-H to 1A4XA4-H
1A4A6J1-7 to 11A4XA4-J
1A4A6J1-5 to 11A4XA4-4
1A4A6J1-E to 1A4XA4-5
1A4A6J1-F to 1A4XA4-D
1A4A6J1-6 to 1A4XA4-E
203
Connect multimeter between 1A4XA5J5-15 and ground. Check
Voltages check good.
Yes: step 206
coarse steering voltages as shown below.
No: step 208
Coarse Steering
1 MHz
1A4XA6J5 Pin 15
Switch Setting
Volts
0
1.37
1
1.78
2
2.18
3
2.75
4
3.31
5
4.12
6
4.93
7
6.15
8
7.85
9
9.56
204
Continuity check the following:
Continuity checks good.
Yes: step 300
1A4XA4-12 to 1A4XA5-7
No: step 297
1A4XA4-13 to 1A4XA5-6
205
Continuity check 1A4A6-1 to 1A4XA2-U
Continuity checks good.
Yes: step 285
No: step 297
206
Continuity check 1A4XA5-15 to 1A4XA6-C.
Continuity checks good.
Yes: step 207
No: step 297
207
Check switch 1A1S2D rear switch 1A1S15 and 1A1R1 thru
Components check good.
Yes: step 285
R11.
No: replace faulty compo-
nent
208
Using multimeter, perform 10 MHz switch/VHF Divider preset
10 MHz/VHF Divider preset checks are good.
Yes: step 209
checks as shown below.
No: step 300
10 MHz
1A4XA4-12
1A4XA4-13
Switch Setting
Volts
Volts
0
0.8 or less
2.0 - 5.0
1
2.0 - 5.0
0.8 or less
2
0.8 or less
0.8 or less
209
Continuity check
Continuity checks good.
Yes: step 211
1A4XA4J4-12 to 1A4XA5J5-7
No: step 297
1A4XA4J4-3 to 11A4XA5J5-6
1A4A6J1-2 to 11A4XA5J5-18
1A46J1-3 to 1A4XA5J5-17
1A46J1-13 to 1A4XA5J5-16
210
Continuity check
Continuity checks good.
Yes: step 301
1A4A6J1-2 to 1A1S1A-10, front
No: step 285
1A4A6J1-3 to 1A1S1A-1, front
1A4A6J1-B to 1A1S1A-2, front
211
Components check good.
Yes: step 212
indication in step 6b.
No: replace faulty compo-
nent.
4-17
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