Quantcast Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued - TM-11-5820-873-340040

 

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Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued - TM-11-5820-873-340039
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued - TM-11-5820-873-340041


TM 11-5820-873-34
Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued
STEP
ACTION
INDICATION
NEXT STEP
98
Continuity check 1A4XA4-B to 1A4XA3-15.
Continuity checks good.
Yes: step 139
No: step 132
99
Connect multimeter between 1A4XA2J2-U and
Voltages check good
Yes: step 100
ground. Check low digit coarse steering voltages
No. step 101
as shown.
100
Continuity check
Continuity checks good
Yes: step 141
1A4A6J1-12 to 1A4XA2J2-M
No: step 132
1A4A6J1-11 to lA4XA2J2-10
1A4A6J1-M to 1A4XA2J2-11
1A4A6J1-Nto 1A4XA2J2-12
1A4A6J1-13 to 1A4XA2J2-P
1A4A6J1-10 to 1lA4XA2J2-12
1A4A6J1-L to 1A4XA2J2-13
1A4A6J1-P to 1A4XA2J2-N
1A4A6J1-14 to IA4XAZJ2-S
1A4A6J1-9to 1A4XA2W2-14
1A4A6J1-K to 1A4XA2J2-15
1A4A6J1-R to lA4XA2J2-R
101
Using multimeter perform 10 MHz switch/VHF
10 MHz/VHF Divider preset checks are good
Yes: step 102
Divider preset checks as shown below
No: step 142
10MHz
1A4XA4J4-12
1A4X4J4-13
Switch Setting
Volts
Volts
0
8 or less
2.0 to 5 0
1
2.0 to50
8 or less
2
0.8 or less
0.8 or less
102
Continuity check
Continuity checks good
Yes: step 103
1A4XA4J4-12 to 1A4XA5J5-7
No: step 132
1A4XA4J4-3 to 1A4XA5J5-6
1A4A6J1-2 to 1A4XA5J5-18
1A4A6J1-3 to 1A4XA5J5-17
1A46J1-B to 1A4XA5J5-16
103
Continuity check
Continuity checks good
Yes: step 140
1A4A6J1-2 to 1A1S1A-10, front
No: step 132
1A4A6J1-3 to 1A1S1A-1, front
1A4A6Jl-B to 1A1S1A-2, front
104
Connect multimeter between 1A4XA5J5-15 and
Voltages check good
Yes: step 132
ground Check coarse steering voltages as shown
No: step 140
below
Coarse Steering
1A4XA5J5 pin 15
1 MHz Switch Setting
VOLTS
0
1.37
1
1.78
2
2.18
3
2.75
4
3.31
5
4.12
6
4.93
7
6.15
8
7.85
9
9.56
105
Replace VHF Divider CCA 1A4A4 with known
Respective indications are correct
Yes: step 142
good VHF Divider CCA Repeat steps 81, 82. and
No: step 132
83.
106
Replace VHF VCO CCA 1A4A5 with known good
Indication Is correct
Yes: step 140
VHF VCO CCA Repeat step 84.
No: step 132
107
Replace Low Digit Generator CCA 1A4A2 with
Indication is correct
Yes: step 141
known good Low Digit generator Repeat step 85.
No: step 132
108
Connect multimeter across 1A1DS2 contacts.
Multimeter indicates + 12 VDC 0.8 VDC
Yes: replace 1A1DS2
No: step 109
109
Connect multimeter between 1A4XA3J3-A and
Multimeter indicates + 7 6 VDC 0.8 VDC
Yes: step 132
ground.
No: step 139
3-10


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