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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
133
Check switch 1A1S13A front.
Switch checks good.
Yes: step 285
No: replace switch
1A1S13
134
Check relay 1A8K1.
Relay checks good.
Yes: step 285
No replace relay 1A8K1.
135
Check components 1A6A1F3 and 1A6Q103.
Components check good.
Yes: step 286
No: replace faulty compo-
nent
136
Connect multimeter between 1A4A6-E2 and ground.
Multimeter indicates + 5 VDC 0.25 VDC .
Yes: step 297
No: step 285
137
Connect multimeter between 1A4XA4J4-15 and ground.
Multimeter indicates + 2.0 VDC 0.5 VDC.
Yes: step 297
No: step 140
138
Connect multimeter between TCXO 1A8U1-2 and ground.
Multimeter indicates + 12 VDC 0.8 VDC.
Yes: replace TCXO
1A8U1.
No: step 142
139
Connect oscilloscope to 1A4A6-E5 ground lead to ground.
Oscilloscope displays waveform similar to Fig. 4-2F,
Yes: step 297
0.3V to .09V peak-to-peak.
Frequency counter
No: step 285
Indicates 5.0 MHz 5 Hz.
140
Set FREQUENCY A controls to 00.0000 MHz. Connect
Oscilloscope displays waveform similar to Fig. 4-2G.
Yes: step 141
oscilloscope probe to 1A4XA4J4-V ground lead to ground.
No: step 158
141
Connect oscilloscope to 1A4XA4J4-B, ground lead to ground.
Oscilloscope displays waveform similar to Fig. 4-2H.
Yes: step 302
No: step 143
142
Check the following components, 1A8C1, 1A8C2, and 1A8L1.
Components check good.
Yes: step 285
No: replace faulty compo-
nent
143
Connect oscilloscope to 1A4XA3J3-15, ground lead to ground.
Oscilloscope displays waveform similar to Fig. 4-2H.
Yes: step297
No: step 144
144
Connect VTVM (AC) to 1A4XA3J3-D, ground lead to ground.
VTVM indicates 0.085 V minimum
Yes: step 145
No: step 148
145
Connect frequency counter to oscilloscope vertical output jack.
Oscilloscope displays waveform similar to Fig. 4-2J,
Yes: step 146
Connect oscilloscope probe to 1A4XA3J3-P. Ground lead to
0.3 V minimum amplitude.
Frequency counter
No: step 149
ground.
indicates 20 MHz 20 Hz. See Fig. 4-6 below.
146
Remove Translator CCA 1A4A3. Connect frequency counter to
Frequency counter indicates between 1.5000 MHz and
Yes: step 147
1A4XA3J3-B, ground lead to ground.
1.59999 MHz.
No: step 150
147
Reinstall Translator CCA 1A4A3 Connect frequency counter to
Frequency counter indicates between 111.0000 MHz
Yes: step 299
1A4XA3J3-U, ground lead to ground.
and 122.0000 MHz.
No: step 151
148
Connect VTVM (AC) to 1A4XA1J1-4, ground lead to ground.
VTVM indicates 0.085 V minimum
Yes: step 297
No: step 296
149
Connect oscilloscope probe to 1A4XA1J1-1 ground lead to
Oscilloscope displays waveform similar to Fig. 4-2J,
Yes: step 297
ground.
0.3 V minimum amplitude.
Frequency counter
No: step 296
indicates 20 MHz 20 Hz.
150
Connect frequency counter to 1A4XA2J2-1, ground lead to
Frequency counter indicates between 1.5000 MHz and
Yes: step 297
ground.
1.5999 MHz.
No: step 152
151
Connect frequency counter to 1A4XA5J5-2, ground lead to
Frequency counter indicates between 111.0000 MHz
Yes: step 297
ground.
and 122.0000 MHz.
No: step 300
152
Connect VTVM (AC) to 1A4XA2J2-C, ground lead to ground.
VTVM indicates 0.09 V peak-to-peak minimum.
Yes: step 153
No: step 155
153
Connect frequency counter to oscilloscope vertical output jack.
Oscilloscope displays waveform similar to Fig. 4-2K.
Yes: step 154
Connect oscilloscope probe to 1A4XA2J218, ground lead to
Frequency counter indicates 1KHz 1 Hz.
No: step 156
ground.
154
Connect multimeter between 1A4XA2J2-U and ground.
Multimeter indicates + 7.7 VDC 0.8 VDC.
Yes: step 301
No: step 157
155
Connect VTVM (AC) to 1A4XA1J1-6, ground lead to ground.
VTVM indicates 0 09 V peak-to-peak
Yes: step 156
No: step 296
156
Connect oscilloscope probe to 1A4XA1J1-18, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2G.
Yes: step 297
ground.
No: step 296
157
Connect multimeter between 1A1S15, front, pin 5 and ground.
Multimeter indicates + 7.7 VDC 0.8 VDC.
Yes: step 158
No: step 160
158
Connect multimeter between 1A4A6-1 and ground.
Multimeter indicates + 7.7 VDC 0.8 VDC.
Yes: step 297
No: step 285
4-10
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