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Page Title:
Table 3-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92-Continued |
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|  TM 11-5820-873-34
Table 3-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC-92-Continued
STEP
ACTION
INDICATION
NEXT STEP
27
CAUTION
Ensure VTVM is Isolated from ground
Connect VTVM between 2XA2-2 and 2XA2-3
Meter indicates a voltage difference(+ or -)
Yes: step 28
No: step 39
28
Set mode switch to OFF. Connect multimeter
Meter indicates 1000 ohms or more.
Yes step 29
between 2XA2-8 and ground.
No: step 39
29
Connect multimeter between 2XA2-11 and
Meter indicates 1000 ohms or more
Yes: step 38
ground.
No step 39
30
Set mode switch to OFF Remove Control Logic
Meter indicates greater than 0.1 VDC
Yes step 31
CCA 2A1. Set mode switch to AM. Connect
No: step 39
VTVM between 2XA1-3 and 2XA 1-F
31
Connect VTVM between 2XA1-B and ground
Meter indicates + 12 VDC 4 VDC
Yes step 32
No: step 39
32
Set mode switch to OFF Reinstall Control Logic
Meter indicates 0 VDC 0.5 VDC
Yes step 38
CCA 2A2 Remove Phase and Amplitude Control
No: Reinstall Phase
CCA 2A2 Set mode switch to CPLR TUNE KW.
and Amplitude
Connect VTVM between 2XA2- 10 and ground.
Control CCA
33
Set mode switch to OFF Remove Control Logic
2A2, go to
CCA 2A1 Set mode switch to CPL,RTUNE KW
step 37
CAUTION
When testing on or jumpering connector con-
tacts, take care not to short adjacent contacts
Connect VTVM between 2XA1-2 and ground
Meter indicates + 10 VDC 0. 8 VDC
Yes step 37
No: step 39
34
Set mode switch to OFF Replace Control Logic
NOTE
CCA 2A1 with a known good Control Logic CCA
If the time delay runs out during this test, de-
Set mode switch to CPLR TUNE KW
Depress press TUNE START once more If tuning
TUNE START.
occurs the second time, the indication is good
Antenna Coupler completes tune cycle,
Yes step 37
COUPLER STATUS FAULT indicator goes out
No: step 39
and COUPLER STATUS READY illuminates.
35
Set mode switch to OFF Replace Control Logic
COUPLER STATUS READY indicator goes out
Yes step 37
CCA 2A1 with a known good Control Logic CCA
and COUPLER STATUS FAULT indicator
No: step39
Set mode switch to CPLR TUNE KW. Depress
illuminates.
TUNE START to tune antenna coupler Set mode
switch to CW then return to CPLR TUNE KW
36
Set mode switch to OFF Replace Control Logic
COUPLER STATUS FAULT indicator goes out
Yes step37
CCA 2A1 with a known good Control Logic CCA
and COUPLER STATUS READY indicator
No: step 39
Set mode switch to CPLR TUNE KW
Depress illuminates.
TUNE START to tune antenna coupler Set mode
switch to CW then return to CPLR TUNE KW
Finally, set mode switch to AM and key
37
Replace Control Logic CCA 2A1 Route original
Control Logic CCA to next higher maintenance
level for repair
38
Replace Phase and Amplitude Control CCA 2A2
Route original Phase and Amplitude Control CCA
to next higher maintenance level for repair
39
Unit not authorized for repair at this main-
tenance level. Route Antenna Coupler
CU-2229/URC-92 to next higher maintenance
level for repair
3-15
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