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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
24
Connect multimeter between 1A3XA3J3-S and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 25
ground.
No: step 132
25
Set mode switch to OFF. Replace Audio CCA
Receiver-transmitter is disabled.
Yes: step 121
1A3A4 with a known good Audio CCA Set mode
No: step 134
switch to LSB.
26
Connect oscilloscope probe to 1A3XA4J4-18,
Check for noise above ambient level.
Yes: step 132
ground lead to ground.
No: step 27
27
Connect multimeter between 1A3XA4J4-14 and
Multimeter indicates + 2 VDC to 8.0 VDC.
Yes: step 133
ground.
No: step 132
28
Connect multimeter between 1A3XA4J4-15 and
Multimeter indicates +2 VDC to +8.0 VDC.
Yes: step 132
ground.
No: step 133
29
Connect frequency counter to 1A3XA3J3-D,
Frequency counter indicates 1 KHz.
Yes: step 30
ground lead to ground Depress CW key.
No: step 31
30
Connect frequency counter to 1A3A4P1-4,
Frequency counter indicates 1 KHz.
Yes: step 133
ground lead to ground Depress CW key.
No: step 132
31
Continuity check 1AIJ4 center contact to
Continuity checks good.
Yes step 32
1AlP2-J.
No: step 132
32
Continuity check 1A3XA3J3-2 to 1A3A5-J.
Continuity checks good.
Yes: step 134
No: step 132
33
Connect oscilloscope probe to 1A3XA3J3-16,
Oscilloscope displays waveform similar to Fig
Yes: step 34
ground lead to ground.
3-2C.
No: step 37
34
Connect oscilloscope probe to 1A3XA1J1-5,
Oscilloscope displays waveform similar to Fig
Yes: step 35
ground lead to ground Depress CW key.
3-2D.
No: step 41
35
Remove 1A3P3 from 1A7J1 Connect VTVM
VTVM indicates more than 100 mV.
Yes: step 36
(AC) to 1A3P3 center contact, ground lead to
No: step 42
ground Depress CW key.
36
Remove 1A8P3 from 1A7J2 Connect wattmeter
Wattmeter indicates more than 90 watts.
Yes: step 132
to 1A7J2 center contact, ground lead to ground
No: step 43
Depress CW key.
37
Connect frequency counter to 1A3XA3J3-F,
Frequency counter indicates 10.5 MHz.
Yes: step 38
ground lead to ground Depress CW key.
No: step 44
38
Connect multimeter between 1A3XA3J3-T and
Multimeter indicates less than + 0.5 VDC.
Yes: step 39
ground Depress CW key
No: step 45
39
Connect multimeter between 1A3XA3J3-S and
Multimeter indicates less than + 1.4 VDC.
Yes: step40
ground Depress CW key
No: step 132
40
Connect multimeter between 1A3XA3J3-10 and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 134
ground
No: step 132
41
Connect oscilloscope probe to 1A3XA2J2-5,
Oscilloscope displays waveform similar to Fig
Yes: step 132
ground lead to ground Depress CW key
3-2D.
No: step 46
42
Reconnect 1A7J1 to 1A3P3 Connect VTVM (AC)
VTVM indicates more than 100 mV.
Yes: step 132
to 1A3XA1J1-8, ground lead to ground Depress
No: step 49
CW key
43
Connect multimeter between 1A7A1J3-F and
Multimeter indicates + 28 VDC 1.5 VDC.
Yes: step 135
ground Depress CW key
No: step 132
44
Connect VTVM (AC) to 1A4XA1J1-13, ground
VTVM indicates 0.1V minimum.
Yes: step 132
lead to ground Depress CW key
No: step 135
45
Connect multimeter between 1A7A1J3-D and
Multimeter indicates less than + 0.5 VDC.
Yes: step 132
ground Depress CW key
No: step 135
46
Connect oscilloscope probe to 1A3XA2J2-16,
Oscilloscope displays waveform similar to Fig
Yes: step 47
ground lead to ground Depress CW key
3-2C.
No: step 132
47
Connect multimeter between 1A3XA2J2-10 and
Multimeter indicates + 12 VDC + 0.8 VDC.
Yes: step 48
ground Depress CW key
No: step 132
48
Connect multimeter between 1A3XA2J2-D and
Multimeter indicates + 10 7 VDC 0.8 VDC.
Yes: step 136
ground Depress CW key
No: step 59
49
Connect multimeter between 1A3XA1J1-U and
Multimeter indicates less than + 1.2 VDC.
Yes: step 50
ground Depress CW key
No: step 61
50
Connect multimeter between 1A3XA1J1-10 and
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 51
ground
No: step 132
51
Connect multimeter between 1A3XA1J1-13 and
Multimeter indicates less than + 8 VDC.
Yes: step 52
ground Depress CW key
No: step 62
52
Connect frequency counter to oscilloscope ver-
Oscilloscope displays waveform similar to Fig
Yes: step 53
tlcal output jack Connect oscilloscope probe to
3-2E, minimum amplitude, 300 millivolts Fre-
No: step 63
1A3XA1J1-1, ground lead to ground
quency counter indicates 80.75 MHz 10 KHz.
3-6
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