Quantcast Antenna Coupler CU-2229/URC-92 Checkout/Troubleshoot - TM-11-5820-873-340070

 

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Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92 (cont) - TM-11-5820-873-340069
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92


TM 11-5820-873-34
Table 4-2. Checkout/Troubleshoot the Receiver-Transmitter RT-1277/URC-92--Continued
STEP
ACTION
INDICATION
NEXT STEP
1A4A2U3 is not at fault; 3. If TP3 is below 1.5 V, TP2 should
be below 15 MHz and vice versa. When yes, check divider
circuit; when on, check oscillator circuit.
302
Replace and/or repair VHF Divider CCA 1A4A4.
Use
---
conventional troubleshooting methods for CCA repair. (If off
frequency by approximately 1 MHz but good when 100 KHz
control is on zero--check 1A4A4U4.)
303
Replace and/or repair DC Inverter Assy. 1A6A2.
Use
conventional troubleshooting methods for repair.  (If blowing
transistors and/or inverter doesn't work--check 1A6A2K1.)
differently by the procedure. The troubleshooting does
4-6.
Antenna
Coupler
CU-2229/URC-92
not consider incorrect or missing supply voltages to
Checkout/Troubleshoot
subassemblies.  Before any replace/repair action is
accomplished on a subassembly, the test technician
The following procedure in Table 4-3 will establish the
should verify all necessary supply voltages at the
operational readiness of CU-2229/URC-92 antenna
subassembly.  Incorrect or missing supply voltages
coupler. Successful completion of the checkout portion
should be repaired using conventional troubleshooting
indicates the antenna coupler is operationally ready for
methods. Refer to List of Illustrations for the appropriate
use.
Troubleshooting procedures are designed to
schematics.
function from incorrect indications in the checkout.
Following any repair action, the test technician must
return to step 1 of the checkout unless instructed
Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92
STEP
ACTION
INDICATION
NEXT STEP
1a
Remove case from Antenna Coupler CU-2229/ URC-92.
Step 2a
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-transmitter is correctly powered
and grounded.
2a
Set mode switch to AM.
COUPLER STATUS FAULT indicator illuminates.
Yes: step 2b
No: step 8
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 TUNE START.
COUPLER STATUS FAULT indicator goes out.
Yes: step 3a
Begin timing and observe COUPLER STATUS indicators.
COUPLER STATUS TUNING indicator is illuminated
No: step 24
and transmitter keys on.  After 35 to 45 seconds,
transmitter unkeys and COUPLER STATUS TUNING
indicator goes out.  COUPLER STATUS FAULT
indicator illuminates.
3a
Disconnect dummy load from receiver-transmitter. Reconnect
COUPLET STATUS TUNING indicator illuminates,
Yes: step 3b
rf cable from Antenna Coupler. Connect 50 ohm dummy load to
transmitter keys and both drive motors, 2M1 and 2M2,
No: step 50
the Antenna Coupler antenna post. Connect ground post to
dive.
ground. Set frequency to 1.602 MHz. Depress TUNE START.
3b
Set mode selector to CW.
COUPLER STATUS FAULT indicator is illuminated,
Yes: step 4a
transmitter unkeys and drive motors stop driving.
No: step 90
4a
Set mode switch to CPLR TUNE KW. Depress TUNE START.
NOTE
If the time delay runs out during this test, depress
TUNE START once more.  If tuning occurs the
second time the indication is good.
4-22


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