Quantcast Antenna Coupler CU-2229/URC-92 Checkout/Troubleshoot - TM-11-5820-873-340042

 

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Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued - TM-11-5820-873-340041
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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Table 3-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92


TM 11-5820-873-34
Table 3-2 Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92-Continued
STEP
ACTION
INDICATION
NEXT STEP
137 Replace VHF Mixer CCA 1A3A1 Route original
---
VHF Mixer CCA to next higher maintenance lev-
el for repair
138 Replace Spectrum Generator CCA 1A4A1 Route
---
original Spectrum Generator CCA to next higher
maintenance level for repair
139 Replace Translator CCA 1A4A3 Route original
---
translator CCA to next higher maintenance level
for repair
140 Replace VHF VCO CCA 1A4A5 Route original
---
VHF VCO CCA to next higher maintenance level
for repair
141 Replace Low Digit Generator CCA 1A4A2 Route
---
original Low Digit Generator CCA to next higher
maintenance level for repair
142 Replace VHF Divider CCA 1A4A4 Route orig-
---
inal Low Digit Generator CCA to next higher
maintenance level for repair
143 Replace ANTENNA COUPLER CONTROL 1A2
---
Route original ANTENNA COUPLER CONTROL
to next higher maintenance level for repair
procedure  The  troubleshooting  does  not  consider
3-6.
Antenna Coupler CU-2229/URC-92
incorrect or missing supply voltages to subassemblies
Checkout/Troubleshoot
Before any replace/repair action is accomplished on a
The following procedures in Table 3-3 will establish the
subassembly, the test technician should verify all
operational  readiness  of  CU-2229/URC-92  antenna
necessary supply voltages at the subassembly Refer to
coupler. Successful completion of the checkout portion
List of Illustrations for appropriate schematics Incorrect or
indicates the antenna coupler is operationally ready for
missing supply voltages are not authorized for repair at
use. Troubleshooting procedures are designed to function
this maintenance level If supply voltage malfunctions are
from incorrect Indications in the checkout Following any
noted, route the Antenna Coupler CU-2229/URC-92 to the
repair action, the test technician must return to step 1 of
next higher maintenance level for repair.
the  checkout  unless  instructed  differently  by  the
Table 3-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92
STEP
ACTION
INDICATION
NEXT STEP
1
Remove case from Antenna Coupler
Step 2a
CU-22291URC-92 Connect RF and control
cables between the Antenna Coupler to be
checked and a known good RT-1277/URC-92
Receiver-Transmitter. Insure the receiver-trans-
mitter is correctly powered and grounded
2a
Set mode switch to AM.
COUPLER STATUS FAULT indicator illumi-
Yes: step 2b
nates.
No: step 7
2b
Disconnect RF cable at the receiver-transmitter
Connect a 50 ohm dummy load to the receiver-
transmitter.
NOTE
A means of timing, in seconds, is required for this
step.
Set mode switch to CPLR TUNE KW. Depress
COUPLER STATUS FAULT indicator goes out
Yes: step 3a
TUNE START. Begin timing and observe
COUPLER STATUS TUNING indicator is Illumi-
No: step 8
COUPLER STATUS indicators.
nated and transmitter keys on. After 35 to 45 se-
conds, transmitter unkeys and COUPLER
STATUS TUNING indicator goes out COUPLER
STATUS FAULT indicator illuminates
3a
Disconnect dummy load from receiver-
COUPLER STATUS TUNING indicator il-
Yes: step 3b
transmitter. Reconnect rf cable from Antenna
luminates, transmitter keys and both drive
No: step14
Coupler. Connect 50 ohm dummy load to the
motors, 2M1 and 2M2, drive.
Antenna Coupler antenna post. Connect ground
3-12


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