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Page Title:
Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued |
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|  TM 11-5820-873-34
Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued
STEP
ACTION
INDICATION
NEXT STEP
93
Connect signal generator to 1A4A6-E17 using 50
Multimeter indicate, more than + 4.5 VDC
Yes: step 94
ohm coaxial cable. Connect multimeter between
No: step 105
1A4A4-TP1 and ground. Set signal generator
frequency to 9.9 MHz, output level to 1 V RMS.
Temporarily unplug translator CCA 1A4A3. Set
10 MHz, 1 MHz, and 100 KHz switches to 0.
94
Slowly increase signal generator frequency.
At 10 0 MHz, multimeter indication changes to
Yes: step 95
less than +0.9 VDC.
No: step 105
95
Using a multimeter between ground and pin indi-
In each case, multimeter indicates greater than
Yes: step 96
cated, and by varying the frequency above and
+ 4.5 VDC with signal generator below the tran-
No: step 105
below the indicated transition frequency,
sition frequency, and less than +0.9 VDC with
perform frequency switch checks as shown below.
signal generator above the transition frequency.
Frequency Checks
Frequency Switch Settings
10 MHz
1 MHz
100 KHz
Frequency (1 KHz)
0
0
1
10.1 MHz
0
0
2
10.2 MHz
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
96
Using a multimeter between ground and pin indi
In each case, multimeter indicates greater than
Yes: step 85
cated, and by varying the frequency above and
+4.5 VDC with signal generator below the tran-
No: step 104
below the indicated transition frequency, per-
sition frequency, and less than +09 VDC with
form frequency switch checks as shown below.
signal generator above the transition frequency.
Frequency Checks
Frequency Switch Settings
10 MHz
1 MHz
100 KHz
Frequency (1 KHz)
1
0
0
20 0 MHz
2
0
0
30 0 MHz
2
9
9
39 9 MHz
97
Connect multimeter between 1A4XA2J2-U and
Voltages check good.
Yes: step 98
ground Check low digit coarse steering voltages
No: step99
as shown below.
VCO Low Digit Coarse Steering
1A4XA2J2 pin U
10 KHz Switch Setting
VOLTS
0
3.50
1
3.85
2
4.15
3
4.55
4
4.95
5
5.40
6
5.90
7
6.40
8
7.00
9
7.70
3-9
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