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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
Frequency Checks
Frequency Switch Settings
Transition
10 MHz
1 MHz
100 KHz
Frequency ( 1
KHz)
0
0
3
10.3 MHz
0
0
4
10.4 MHz
0
0
5
10.5 MHz
0
0
6
10.6 MHz
0
0
7
10.7 MHz
0
0
8
10.8 MHz
0
0
9
10.9 MHz
0
1
0
11.0 MHz
0
2
0
12.0 MHz
0
3
0
13.0 MHz
0
4
0
14.0 MHz
0
5
0
15.0 MHz
0
6
0
16.0 MHz
0
7
0
17.0 MHz
0
8
0
18.0 MHz
0
9
0
19.0 MHz
197
Using a multimeter between ground and pin indicated, and by
In each case, multimeter indicates greater than + 4.5
Yes: step 198
varying the frequency above and below the indicated transition
VDC with signal generator below the transition
No: step 203
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
10 MHz
1 MHz
100 KHz
Frequency ( 1 KHz)
1
0
0
20.0 MHz
2
0
0
30.0 MHz
3
9
9
39.9 MHz
198
Connect multimeter between 1A4XA2J2-U and ground. Check
Voltages check good.
Yes: step 199
low digit coarse steering voltages as shown below.
No: step 200
VCO Low Digit Coarse Steering
10 KHz
1A4XA2J2-U
10 KHz
1A4XA2J2-U
Switch Setting
Volts
Switch Setting
Volts
0
3.50
5
5.40
1
3.85
6
5.90
2
4.15
7
6.40
3
4.55
8
7.00
4
4.95
9
7.70
199
Continuity check 1A4XA4-B to 1A4XA3-15.
Continuity checks good.
Yes: step 299
No: step 297
200
Connect multimeter between 1A4XA2J2-U and ground. Check
Voltages check good.
Yes: step 201
low digit coarse steering voltages as shown below.
No: step 208
VCO Low Digit Coarse Steering
10 KHz
1A4XA2J2-U
10 KHz
1A4XA2J2-U
Switch Setting
Volts
Switch Setting
Volts
0
3.50
5
5.40
1
3.85
6
5.90
2
4.15
7
6.40
3
4.55
8
7.00
4
4.95
9
7.70
201
Continuity check 1A4A6J11-12 to 1A4XA2J2-M
Continuity checks good.
Yes: step 301
1A4A6J1-11 to 1A4XA2J2-10
No: step 297
1A4A6J1-M to 1A4XA2J2-11
1A4A6J1-N to 1A4XA2J2-12
1A4A6J1-13 to 1A4XA2J2-P
1A4A6J1-10 to 1A4XA2J2-12
1A4A6J1-L to 1A4XA2J2-13
4-16
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