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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
53
Connect oscilloscope with frequency counter at
Frequency counter indicates between 111.000
Yes: step 137
vertical output to 1A3XA1J1-18, ground lead to
MHz and 122.000 MHz.
No: step 64
ground.
54
Connect frequency counter to oscilloscope
Oscilloscope displays waveform similar to Fig
Yes: step138
vertical output jack Connect oscilloscope probe
3-2F, 0 3 to 0 9 V peak-to-peak Frequency coun-
No: step 132
to 1A4XA1J1-S, ground lead to ground.
ter indicates 5 0 MHz 5 Hz.
55
Connect multimeter between 1A4A6-E1 and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step56
ground.
No: step 132
56
Connect multimeter between 1A4A6XALJ1-K
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 57
and ground.
No: step 132
57
Connect multimeter between 1A6A1-15 and
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 138
ground.
No: step 58
58
Check fuse 1A6A1F3.
Fuse checks good.
Yes: step 132
No: replace fuse
1A6A1F3 If fuse
blows again go
to step 120
59
Connect multimeter between 1A3A5-R and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 60
ground.
No: step 132
60
Connect multimeter between 1A3A5XA2J2-8
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 136
and ground.
No: step 132
61
Connect multimeter between 1A7A1J3-B and
Multimeter indicates less than +1.2VDC.
Yes: step 132
ground Depress CW key.
No: step 135
62
Connect multimeter between 1A3XA2J2-P and
Multimeter indicates less than + 8.0 VDC.
Yes: step 132
ground Depress CW key.
No: step 136
63
Connect oscilloscope probe to 1A4XA3J3-11,
Oscilloscope displays waveform similar to Fig
Yes: step 132
ground lead to ground.
3-2E. minimum amplitude 300 millivolts Fre-
No: step 65
quency counter indicates 80.75 MHz 10 KHz.
64
Remove 1A3P1 from 1A4A5-J1. Connect fre-
Frequency counter indicates between 111.0000
Yes: step 132
quency counter to oscilloscope vertical output
MHz and 122.0000MHz.
No: step69
Connect oscilloscope probe to 1A4A5-J1 center
pin, ground lead to ground
65
Connect RF voltmeter to 1A4XA3J3-D, ground
RF voltmeter indicates .085 V minimum.
Yes: step 66
lead to ground.
No: step 70
66
Connect frequency counter to oscilloscope ver-
Oscilloscope displays waveform similar to Fig
Yes: step 67
tlcal output jack Connect oscilloscope probe to
3-2G, 0 3 V minimum amplitude. Frequency
No: step 71
1A4XA3J3-P, ground lead to ground.
counter indicates 20 MHz + 20 Hz.
67
Connect frequency counter to 1A4XA3J3-B
Frequency counter indicates between 1.5000
Yes: step 68
ground lead to ground.
MHz and 1.5999 MHz.
No: step 72
68
Connect frequency counter to 1A4XA3J3-U,
Frequency counter indicates between 111.0000
Yes step 139
ground lead to ground.
MHz and 122.0000 MHz.
No: step 73
69
Connect multimeter between 1A4XA5J5-4 and
Multimeter indicates + 2.0 VDC 0.5 VDC .
Yes: step 140
ground.
No: step 74
70
Connect RF voltmeter to 1A4XA1J1-4, ground
RF voltmeter indicates .085 V minimum.
Yes: step 132
lead to ground.
No: step 138
71
Connect oscilloscope probe to 1A4XAIJl-1,
Oscilloscope displays waveform similar to Fig
Yes: step 132
ground lead to ground.
3-2G, 0 3 V minimum amplitude Frequency
No: step 138
counter indicates 20 MHz 20 Hz.
72
Connect frequency counter to 1A4XA2J2-1,
Frequency counter indicates between 1.5000
Yes: step 132
ground lead to ground.
MHz and 1.5999 MHz
No: step 75
73
Connect frequency counter to 1A4XA5J5-2,
Frequency counter indicates between 111.0000
Yes: step 132
ground lead to ground.
MHz and 122.0000 MHz
No: step 140
74
Connect multimeter between 1A4XA4J4-15 and
Multimeter indicates + 2.0 VDC 0.5 VDC
Yes: step 132
ground.
No: step 78
75
Connect frequency counter to oscilloscope ver-
Oscilloscope displays waveform similar to Fig
Yes: step 76
tical output jack Connect oscilloscope probe to
3-2H. Frequency counter indicates 1 KHz 1
No: step 80
1A4XA2J2-18, ground lead to ground
Hz.
76
Connect VTVM (AC) to 1A4XA2J2-C, ground
VTVM indicates .09 V peak-to-peak minimum
Yes: step 77
lead to ground.
No: step 81
77
Connect multimeter between 1A4XA2J2-U and
Multimeter indicates + 7.7 VDC 0.8 VDC
Yes: step 141
ground.
No: step 132
78
Set FREQUENCY A controls to 00.0000 MHz
Oscilloscope displays waveform similar to Fig
Yes: step79
Connect oscilloscope probe to 1A4XA4J4-V,
3-2J.
No: step82
Ground lead to ground
3-7
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