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Page Title:
Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92 |
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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
Antenna Coupler completes tune cycle, COUP LER
Yes: step 4b
STATUS FAULT indicator goes out and COUPLER
No: step 91
STATUS READY indicator illuminates
4b
Set mode switch to CW then return to CPLR
COUPLER STATUS READY indicator goes out and
Yes step 4c
TUNEKW
COUPLER STATUS FAULT indicator illuminates
No step 140
4c
Set mode switch to AM Key transmitter
COUPLER STATUS FAULT indicator goes out and
Yes step 4d
COUPLER STATUS READY indicator illuminates
No step 140
4d
Set frequency to 1.802 MHz Key transmitter
COUPLER STATUS FAULT indicator illuminates-
Yes step 4e
No step 140
4e
Set frequency to 1.602 MHz Key transmitter
COUPLER STATUS READY indicator illuminates
Yes step5a
No step 140
5
Perform the following procedure for each setting listed
NOTE
Yes step 6a
Set and tune to the tune frequency Reset frequency to
The Antenna Coupler Control gain adjustment can affect
No step 129
the check frequency. Set mode switch to CW and
both the REFL power indication and tuning Normal gain
key transmitter Check both the FWD and REFL,
setting is about 14 5 VDC 0 5 VDC but a sight adjustment
power.
may be necessary If some frequencies do not tune, adjust
the gain slightly clockwise If the REFL power indlca
tlon is a little high, adjust the gain slightly coun-
terclockwlse The final gain control setting must
satisfy both requirements If not, proceed to the
troubleshooting reference for this step
NOTE
Antenna Coupler completes each tune cycle Also
The frequencies below do not necessarily match
the power readings should be approximate to one
the average powers listed In the indication
of the acceptable FWD/REFL ratios below
column for this step
Tune
Check
Frequency
Frequency
1.604
1.602
2.004
2.002
4.001
4.000
8.001
8.000
Average
REFL
12.001
12.000
FWD (watts)
(or less)
16.001
16.001
20
0.8
20.001
20.000
30
1.2
24.001
24.000
40
1.6
29.999
29.998
50
2.0
60
24
70
28
80
32
100
40
6a
Set mode switch to OFF Disconnect cabling be-
Step 6b
tween receiver-transmitter and antenna coupler
6b
Reassemble Antenna Coupler Unit
Step 6c
6c
Antenna Coupler Unit CU-2229/URC-92 check-
NOTE
---
out is now complete Antenna Coupler is opera-
For location of parts see figures 4-22 thru 4-66
tionally ready
Yes step8
7
Connect multimeter between 2A3-E7 and
Meter indicates + 5 VDC + 0 25 VDC
ground
No step 10
8
Connect multimeter between 2A3-E21 and
Meter indicates 0 VDC + 0 5 VDC
Yes: step 9
ground
No step 12
Yes step 139.
9
Connect multimeter between 2A3-E5 and
Meter indicates 0 VDC + 0 5 VDC
ground
No: step 13
10
Connect multimeter between 2A3-E8 and
Meter indicates + 10 VDC + 0 8 VDC
Yes step 11
ground
No step 14
11
Check components 2A3AR4, 2A3AC2 and
Components check good
Yes step 139
2A3ACR3
No replace faulty
component
12
Set mode switch to OFF Remove control Logic
Continuity checks good
Yes step 140
CCA 2A1 Continuity check 2A3-E7 to 2XA1-P
No step 139
and 2XA1-12 to 2A3A-E21
13
Check components 2A3AC20, 2A3AL5 and
Components check good
Yes step 139
2A3AC5
No replace faulty
component
Yes step15
14
Connect multimeter between 2A3A-E12 and
Meter indicates +28VDC + 1 5VDC
ground
No step 16
4-23
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