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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
79
Reconnect 1A7J2 to 1ASP3.
Connect oscilloscope to
Oscilloscope displays waveform similar to Fig. 4-2D.
Yes: step 80
1A3XA1J1-5, ground lead to ground. Depress CW key.
No: step 86
80
Remove 1A3P3 from 1A7J1. Connect VTVM(AC) to 1A3P3
VTVM indicates more than l00m V.
Yes: step 81
center contact, ground lead to ground. Depress CW key.
No: step 90
81
Connect multimeter between 1A7A1J3-F and ground. Depress
Multimeter indicates + 28 VDC 1.5 VDC.
Yes: step 293
CW key.
No: step 92
82
Reconnect 1A5J4 to 1ASP5. Remove 1A8P4 from 1A5J2.
Wattmeter indicates more than 90 watts.
Yes: step 83
Connect wattmeter to 1A8P4 center contact ground lead to
No: step 285
ground. Depress CW key.
83
Reconnect 1A5J2 to 1A8P4. Connect multimeter between
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 292
1A8P2-8 and ground. Depress CW key.
No: step 93
84
Continuity check 1A1J4 center contact to 1A1P2-J.
Continuity checks good.
Yes: step 85
No: step 94
85
Continuity check 1A3XA3J3-2 to 1A3A5-J.
Continuity checks good.
Yes: step 294
No: step 287
86
Connect oscilloscope probe to 1A3XA2J2-16, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2C.
Yes: step 90
ground. Depress CW key.
No: step 287
87
Connect multimeter between 1A3A5-R and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 88
No: step 89
88
Connect multimeter between 1A3A5XA2J2-8 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 295
No: step 287
89
Check switch 1A1S13 front.
Switch checks good.
Yes: step 285
No: replace switch
1A1S13.
90
Reconnect 1A7J1 to 1A3P3 Connect VTVM (AC) to
VTVM indicates more than 100 m V.
Yes: step 91
1A3XA1J1-8. Depress CW key.
No: step 95
91
Connect VTVM (AC) to 1A3A56-E20. Depress CW key.
VTVM indicates more than 100 m V.
Yes: step 285
No: step 287
92
Connect multimeter between 1A5J1-18 and ground. Depress
Multimeter indicates + 28 VDC 2.5 VDC.
Yes: step285
CW key.
No: step 292
93
Check switch 1 A1SB, rear, and diode 1A1CR51.
Components check good.
Yes: step 285
No: replace faulty compo-
nent.
94
Continuity check 1A1S13, rear pin 2 to pin 6.
Continuity checks good
Yes: step 285
No: replace switch
1A1S13.
95
Connect multimeter between 1A3XA1J1-U and ground.
Multimeter indicates less than + 1.2 VDC
Yes: step 96
Depress CW key.
No: step 110
Yes: step 97
96
Connect multimeter between 1A3XA1J110 and ground.
Multimeter indicates + 12 VDC + 0. 8 VDC
No: step 287
Depress CW key.
97
Connect multimeter between 1A3XA1J1-13 and ground.
Multimeter indicates less than + 8 VDC
Yes: step 98
Depress CW key.
No: step 112
98
Connect frequency counter to oscilloscope vertical output.
Oscilloscope displays waveform similar to Fig. 4-2E,
Yes: step 99
Connect oscilloscope probe to 1A3A5-E18 ground lead to
minimum amplitude 300 millivolts. Frequency counter
No: step 113
ground. Depress CW key.
indicates 80.75 MHz 10 KHz.
Yes: step 100
99
Connect oscilloscope probe to 1A3A5XA1J1-1, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2E,
No: step 287
ground.
minimum amplitude 300 millivolts. Frequency counter
indicates 80.75 MHz + 10 KHz.
100
Connect frequency counter to oscilloscope vertical output.
Frequency counter indicates between 111.0000 MHz
Yes: step 101
Connect oscilloscope probe to 1A3A5-E24, ground lead to
and 122.0000 MHz.
No: step 114
ground. Depress CW key.
101
Connect oscilloscope, with frequency counter, at vertical output
Frequency counter indicates between 111.0000 MHz
Yes: step 298
to 1A3XA1J1-18, ground lead to ground.
and 122.0000 MHz.
No: step 287
102
Connect multimeter between 1A3XA3J310 and ground.
Multimeter indicates + 12 VDC 0.8 VDC .
Yes: step 103
Depress CW key.
No: step 106
103
Connect multimeter between 1A3XA3J3-T and ground.
Multimeter indicates less than + 0.5 VDC.
Yes: step 104
Depress CW key.
No: step 115
104
Connect multimeter between 1A3XA3J3-S and ground.
Multimeter indicates less than + 1.4 VDC.
Yes: step 105
Depress CW key.
No: step 118
4-8
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