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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
159
Connect oscilloscope probe to 1A4XA1J1-17, ground lead to
Oscilloscope displays waveform similar to Fig. 4-2G.
Yes: step 297
ground.
No: step 296
160
Connect multimeter between 1A1S4B, rear, pin 7 and ground.
Multimeter indicates + 7.7 VDC 0.8 VDC.
Yes: step 161
No: step 162
161
Set mode switch to OFF. Continuity check 1AlS15, front, pin 2
Continuity checks good.
Yes: step 285
to pin 5.
No: replace switch
1A1S15
162
Check the following components 1A1R12, 1A1R13, 1A1R14,
Components check good.
Yes: step 285
1A1R15, 1A1R16, 1A1R17, 1A1R18, 1A1R19, 1A1R20,
No: replace faulty compo-
1A1R22, and 1A1S4B, rear.
nent.
163
Continuity check 1A1J1-B to 1A3A5-H.
Continuity checks good.
Yes: step 164
No: step 285
164
Continuity check 1A3XA3J3-3 to 1A3XA 5J5-H.
Continuity checks good.
Yes: step 294
No: step 297
165
Check resistance between 1A3A5-D and junction of 1A1C1 and
Multimeter indicates 5000 ohms or less
Yes: step 166
1A1TB1.
No: step 171
166
Check components 1AIC1, 1A1C2, and 1A1C3.
Components check good.
Yes: step 167
No: replace faulty compo-
nent.
167
Check 1A1J1.
1A1J1 checks good.
Yes: step 168
No: replace 1A1J1
168
Continuity check 1A3A5-D to 1A3XA3J3-18
Continuity checks good.
Yes: step 169
No: step 287
169
Connect multimeter between 1A3XA3J3-17 and ground.
Multimeter indicates less than + 1.6 VDC.
Yes: step 170
No: step 173
170
Connect frequency counter to 1A3XA2J2-1.
Frequency counter indicates 10.5 MHz.
Yes: step 295
No: step 174
171
Continuity check 1A3XA5J5-D to 1AlS13B, front, pin 8.
Continuity checks good.
Yes: step 183
No: step 182
172
Check resistance between 1A1S13B, front, pin 8, and junction,
Multimeter indicates 5000 ohms or less
Yes: step 285
1A1C1 and TB1.
No: step 183
173
Connect multimeter between 1A3A5-E15 and ground.
Multimeter indicates less than + 1.6 VDC.
Yes: step 287
No: step 184
174
Connect frequency counter to 1A3XA3J3-1.
Frequency counter indicates 10.5 MHz.
Yes: step 287
No: step 294
175
Check switch 1A1S13A, front.
Switch checks good.
Yes: step 176
No: replace switch
1A1S13
176
Continuity check 1A3XA5-S to 1A3XA3-9.
Continuity checks good.
Yes: step 285
No: step 287
177
Connect multimeter between 1A3A5-E11 and ground.
Multimeter indicates +12 VDC 0 8 VDC
Yes: step 178
No: step 181
178
Connect multimeter between 1A3A5XA2J2-6 and ground.
Multimeter indicates + 12 VDC 0 8 VDC
Yes: step 179
No: step 287
179
Connect multimeter between 1A3A5XA3J3-5 and ground.
Multimeter indicates + 12 VDC 0 8 VDC
Yes: step 180
No: step 287
180
Connect frequency counter to 1A3A5XA2J2-1, ground lead to
Frequency counter indicates 10.5 MHz.
Yes: step 295
ground.
No: step 294
181
Check relay 1A8K1 and switch 1A1S13A front.
Components check good.
Yes: step 285
No: replace faulty compo-
nent.
182
Continuity check 1A1S13B, front, pin 8 to pin 10.
Continuity checks good.
Yes: step 285
No: replace switch
1A1S13.
183
Check resistor 1A1R51.
Component checks good.
Yes: step 285
No: replace resistor
1A1R51
184
Connect multimeter between 1A8P2-10 and ground.
Multimeter indicates less than + 1 6 VDC
Yes: step 285
No: step 292
185
Wattmeter indicates 100 W 10 W
Yes: step 186
which the frequency counter and readout did not agree.
No: step 189
4-11
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