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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
190
Check switches 1A1S7, 1A1S8, 1A1S1 and
Switches check good.
Yes: step 292
1A1S2.
No: replace faulty switch
191
Check FREQ CONTROL switch 1A1S15.
Switch checks good.
Yes: step 192
No: replace switch
1A1S15
192
Set mode switch to LSB. Check frequency switch
Components check good.
Yes: step 193
and associated diode related to faulty indication
No: step 274
in step 167. (Refer to FO-10).
193
Remove Translation CCA 1A4A3. Connect fre-
Frequency checks are correct.
Yes: step 194
quency counter to 1A4XA2J2-1. Perform fre-
No: step 201
qeuncy checks as shown below.
Frequency Checks
Frequency Switch Settings
10 KHz
1 KHz
100 Hz
Frequency
0
0
1
1.5001 MHz
0
0
2
1.5002MHz
0
0
3
1.5003 MHz
0
0
4
1.5004 MHz
0
0
5
1.5005 MHz
0
0
6
1.5006MHz
0
0
7
1.5007MHz
0
0
8
1.5008 MHz
0
0
9
1.5009 MHz
Frequency Switch Settings
10 KHz
1 KHz
100 Hz
Frequency
0
1
0
1.5010 MHz
0
2
0
1.5020 MHz
0
3
0
1.5030 MHz
0
4
0
1.5040 MHz
0
5
0
1.5050 MHz
0
6
0
1.5060 MHz
0
7
0
1.5070 MHz
0
8
0
1.5080 MHz
0
9
0
1.5090 MHz
Frequency Switch Settings
10 KHz
1 KHz
100 Hz
Frequency
1
0
0
1.5100 MHz
2
0
0
1.5200 MHz
3
0
0
1.5300 MHz
4
0
0
1.5400 MHz
5
0
0
1.5500 MHz
6
0
0
1.5600 MHz
7
0
0
1.5700 MHz
8
0
0
1.5800MHz
9
0
0
1.5900 MHz
194
Connect signal generator to 1A4A6-E17 using 50 ohm coaxial
Multimeter indicates more than + 4.5 VDC.
Yes: step 195
cable. Connect multimeter between 1A4A4-TP1 and ground.
No: step 199
Set signal generator frequency to 9.9 MHz, output level to 0.1 V,
RMS. Set 10 MHz, 1 MHz, and 100 KHz switches to 0.
195
Slowly increase signal generator frequency.
At 10.0 MHz, multimeter indication changes to less
Yes: step 196
than + 0.9 VDC.
No: step 299
196
Using a multimeter between ground and pin indicated, and by
In each case, multimeter indicates greater than + 4.5
Yes: step 197
varying the frequency above and below the indicated transition
VDC with signal generator below the transition
No: step 202
frequency, perform frequency switch checks as shown below.
frequency, and less than + 0.9 VDC with signal
generator above the transition frequency.
Frequency Checks
Frequency Switch Settings
Transition
10MHz
1 MHz
100 KHz
Frequency ( 1
KHz)
0
0
1
10.1 MHz
0
0
2
10.2 MHz
4-15
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