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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
105
Connect frequency counter to 1A3XA3J3-F, ground lead to
Frequency counter indicates 10.5 MHz.
Yes: step 294
ground. Depress CW key.
No: step 120
106
Connect multimeter between 1A3A5-E6 and ground. Depress
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 287
CW key.
No
step 107
107
Connect multimeter between 1A3A5-E32 and ground. Depress
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 287
CW key.
No
step 108
108
Check relay 1A8K1.
Relay checks good.
Yes: step 109
No: replace relay 1A8K1
Yes: step 285
109
Check switch 1A1S13, rear.
Switch checks good.
No: replace switch
A1S13
110
Connect multimeter between 1A7A1J3-B and ground. Depress
Multimeter indicates less than + 1.2 VDC.
Yes: step 111
CW key.
No: step 293
111
Connect multimeter between 1A3A5-E13 and ground. Depress
Multimeter indicates less than + 1.2 VDC.
Yes: step 287
CW key.
No: step 274
112
Connect multimeter between 1A3XA2J2-P and ground.
Multimeter indicates less than + 8.0 VDC.
Yes: step 287
Depress CW key.
No: step 285
Yes: step 285
113
Connect oscilloscope probe to 1A4XA3J3-11, ground lead to
Oscilloscope displays waveform similar to Fig.
No: step 299
ground.
4-2E, minimum amplitude 300 millivolts. Frequency
counter indicates 80.75 MHz + 10 KHz.
114
Remove 1A3Pl from 1A4A5-J1 Connect frequency counter to
Frequency counter indicates between 111.0000 MHz
Yes: step 285
oscilloscope vertical output. Connect oscilloscope probe to
and 122.0000 MHz.
No: step 123
1A4A5-J1 center pin, ground lead to ground.
115
Disconnect 1A8P2 from 1A5J1. Connect multimeter between
Multimeter indicates less than + 0.5 VDC.
Yes: step 116
1A7A1J3-D and ground. Depress CW key.
No: step 293
116
Reconnect 1A8P2 to 1A5J1. Connect multimeter between
Multimeter indicates less than + 0.6 VDC.
Yes: step285
1A5J1-0 and ground. Depress CW key.
No: step 118
117
Set mode switch to OFF. Disconnect 1A5P5 from 1A5J4.
Multimeter indicates 50 ohms 4 ohms.
Yes: step 292
Connect multimeter between center contact of 1A8P5 and
No: step 285
ground.
118
Connect multimeter between 1A5J1-9 and ground. Depress
Multimeter indicates less than + 1.4 VDC.
Yes: step 119
CW key.
No: step 292
119
Connect multimeter between 1A3A5-E14 and ground.
Multimeter indicates less than + 1.4 VDC.
Yes: step 287
No: step 285
120
Connect VTVM (AC) to IA4XAlJl-13 ground lead to ground.
VTVM indicates 0.1 V minimum.
Yes: step l21
No: step 124
121
Connect VTVM (AC) to 1A4A6-E3, ground lead to ground.
VTVM indicates 0.1 V minimum.
Yes: step 122
Depress CW key.
No: step 285
122
Connect VTVM (AC) to 1A3A5-E16, ground lead to ground.
VTVM indicates 0.1 V minimum.
Yes: step 287
Depress CW key.
No: step 285
123
Reconnect 1A4A5-J1 to 1A3P1. Connect multimeter between
Multimeter indicates + 2.0 VDC 0.5 VDC.
Yes: step 300
1A4XA5J5-4 and ground.
No: step 137
124
Connect frequency counter to oscilloscope vertical output jack.
Oscilloscope displays waveform similar to Fig. 4-2F,
Yes: step 125
Connect oscilloscope probe to 1A8U1-6 ground lead to ground.
.3V to .9V peak-to-peak. Frequency counter indicates
No: step 138
5.0 MHz 5 Hz.
125
Connect oscilloscope probe to 1A4XA1J1-S, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2F,
Yes: step 126
ground.
.3V to .9V peak-to-peak. Frequency counter indicates
No: step 139
5.0 MHz 5 Hz.
126
Connect multimeter between 1A4A6-E1 and ground.
Multimeter indicates + 12 VDC 0.8 VDC .
Yes: step 127
No: step 285
127
Connect multimeter between 1A4A6XA1J1-K and ground.
Multimeter indicates + 12 VDC 0.8 VDC .
Yes: step 128
No: step 297
128
Connect multimeter between 1A6A1-15 and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 129
No: step 135
129
Connect multimeter between 1A4A6XA1J1-M and ground.
Multimeter indicates + 5 VDC 0.25 VDC.
Yes: step 130
No: step 131
130
Connect multimeter between 1A4A6-L and ground.
Multimeter indicates less than 1 VDC.
Yes: step 296
No: step 136
131
Connect multimeter between 1A4A6-E16 and ground.
Multimeter indicates 1 VDC or more.
Yes: step 132
No: step 297
132
Connect multimeter between 1A1P1-18 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: step 133
No: step 134
4-9
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