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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
79
Connect oscilloscope to 1A4XA4J4-B, ground
Oscilloscope displays waveform similar to Fig
Yes: step 142
lead to ground.
3-2K.
No: step 83
80
Connect oscilloscope probe to 1A4XA1J1-18,
Oscilloscope displays waveform similar to Fig
Yes: step 132
ground to lead ground.
3-2H.
No: step 138
81
Connect VTVM (ACO 1A4XA1J1-6, ground lead
VTVM indicates 09 V peak-to-peak minimum.
Yes step 132
to ground.
No: step 138
82
Connect oscilloscope probe to 1A4XA1J1-17,
Oscilloscope displays waveform similar to Fig
Yes: step132
ground lead to ground.
3-2J.
No: step 138
83
Connect oscilloscope to 1A4XA3J3-15, ground
Oscilloscope displays waveform similar to Fig
Yes: step 132
lead to ground.
3-2L.
No: step 139
84
Replace Sideband Generator CCA with known
Oscilloscope displays waveform similar to Fig
Yes: step 134
good Sideband Generator CCA Key microphone.
3-2A, less than 2 V peak-to-peak maximum.
No: step 132
85
Connect multimeter between 1A3XA3J3-17 and
Multimeter indicates less than +1.6VDC.
Yes: step 86
ground.
No: step 132
86
Connect frequency counter to 1A3XA2J2-1.
Frequency counter indicates 10.5 MHz.
Yes: step 136
No: step 87
87
Connect frequency counter to 1A3XA3J3- 1.
Frequency counter indicates 10.5 MHz.
Yes: step 132
No: step 134
88
Connect multimeter between 1A3A5-E11 and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 89
ground.
No: step 132
89
Connect multimeter between 1A3A5XA2J2-6
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 90
and ground.
No: step 132
90
Connect multimeter between 1A3A5XA3J3-5
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 91
and ground.
No: step 132
91
Connect frequency counter to 1A3A5XA2J2-1,
Frequency counter indicates 10.5 MHz.
Yes: step 136
ground lead to ground.
No: step 134
92
Remove Translator CCA 1A4A3 Connect fre-
Frequency checks are correct.
Yes: step 93
quency counter to 1A4XA2J2-1. Perform fre-
No: step 97
quency checks as shown below.
Frequency Checks
Frequency Switch Settings
10 KHz
1 KHz
100 Hz
FREQUENCY
0
0
1
1.5001 MHz
0
0
2
1.5002 MHz
0
0
3
1.5003 MHz
0
0
4
1.5004 MHz
0
0
5
1.5005 MHz
0
0
6
1.5006 MHz
0
0
7
1.5007 MHz
0
0
8
1.5008 MHz
0
0
9
1.5009MHz
10 KHz
1 KHz
100 Hz
FREQUENCY
0
1
0
1.5010 MHz
0
2
0
1.5020 MHz
0
3
0
1.5030 MHz
0
4
0
1.5040 MHz
0
5
0
1.5050 MHz
0
6
0
1.5060 MHz
0
7
0
1.5070 MHz
0
8
0
1.5080 MHz
0
9
0
1.5090 MHz
10 KHz
1 KHz
100 Hz
FREQUENCY
1
0
0
1.5100 MHz
2
0
0
1.5200 MHz
3
0
0
1.5300 MHz
4
0
0
1.5400 MHz
5
0
0
1.5500 MHz
6
0
0
1.5600 MHz
7
0
0
1.5700 MHz
8
0
0
1.5800 MHz
9
0
0
1.5900 MHz
3-8
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