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Page Title:
Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92--Continued |
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|  TM 11-5820-873-34
Table 4-3 Checkout/Troubleshoot the Antenna Coupler CU-2229/URC- 92-Continued
STEP
ACTION
INDICATION
NEXT STEP
83
Check that 2S3 C MIN switch is not activated and
2S3 checks good
Yes: reinstall
that 2S3 contacts are open
removed com-
ponents. go to
step 139
No: reinstall removed
components Re-
place switch 2S3,
perform C MIN
and C MAX
adjustment
84
Check that 2S4 C MAX switch Is not activated
2S4 checks good
Yes: reinstall
and that 2S4 contacts are open
removed com-
ponents. go to
step 139
No: reinstall removed
components Re
place 2S4, per-
form C MIN and
C MAX adjust-
ment
85
Perform Amplitude Detector Adjustment
Amplitude Detector adjusts to within tolerance
Yes: reinstall
removed com-
ponents, go to
step 3a.
No: reinstall removed
components, go
to step 143
86
Set mode switch to OFF Check wiring for contin-
Wiring checks good
Yes: reinstall
uity and shorts to ground between 2J2 and
removed com-
2A3-E3 and between 2A3-E4 and 2XA1-B
ponents, go to
step 144
No: reinstall removed
components, go
to step 139
87
Set mode switch to OFF. Disconnect connector
Meter indicates 0 VDC 0.5 VDC
Yes: reinstall
from Servo Control Assy 2A6 Set mode switch
removed com-
to AM. Connect VTVM between 2XA6-M and
ponents, go
ground.
to step 142
No: reinstall removed
components, go
to step 140
88
Perform Phase Detector Adjustment
Phase Detector adjusts to within tolerance
Yes: step 3a
No: reinstall removed
components, go
to step 143
89
Set mode switch to OFF Remove Control Logic
Meter indicates + 10 VDC 0.8 VDC
Yes: step 140
CCA 2A1 Set mode switch to CPLR TUNE KW
No: step 90
Connect VTVM between 2XA1-2 and ground
90
Continuity check the following
Continuity checks good
Yes: replace
2A3-E8 to 2K1-12
2K1 Reinstall
2K1-8 to2XA1-2
removed
components
No: reinstall removed
components, go
to step 139
91
COUPLER STATUS FAULT indicator s lit
Yes: step 92
No: step 101
92
Set frequency to 15.602
NOTE
If the time delay runs out during this test, de-
Yes: step 93
press TUNE START again If tuning occurs the
No: step 102
second time the Indication is good
Antenna Coupler completes tune cycle and
Yes: step 93
COUPLER STATUS READY indicator illuml-
No: step 102
nates
4-28
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