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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
15
Check components 2A3AC13, 2A3AL12,
Components check good
Yes: step 139
2A3AC12, 2R1, and 2CR2
No: replace faulty
component.
16
Set mode switch to OFF Remove and check fuse
Fuse checks good
Yes reinstall fuse
2F1
2F1 and go to
step 139
No step 17
17
Connect multimeter between 2A3A-E14 and
Meter indicates more than 25 ohms
Yes step21
ground
No step 18
18
Remove Phase and Amplitude CCA 2A2 Connect
Meter indicates more than 25 ohms
Yes step 141
multimeter between 2A3A-E14 and ground
No step 19
19
Reinstall Phase and Amplitude CCA 2A2 Re-
Meter indicates 25 ohms or more
Yes step 140
move Control Logic CCA 2A1 Connect multim-
No step 20
eter between 2A3A-E14 and ground
20
Reinstall Control Logic CCA 2A1 Check compo-
Components check good
Yes replace fuse
nents, 2A3AC12, 2A3AC13, 2K1, 2CR3, 2K4,
2F1 and go to
2CR1 and 2A5 for shorts and/or shorts to ground
step 139
No replace fuse and
replace faulty
component
21
Connect multimeter between 2A3-E6 and
Meter indicates 100 ohms or more
Yes replace fuse 2F1
ground
No step 22
22
Disconnect connector from Servo Control Assy
Meter indicates 100 ohms or more
Yes step 142
2A6 Connect multimeter between 2A3-E6 and
No step 23
ground
23
Reconnect connector to Servo Control Assy 2A6
Components check good
Yes step 139
Check components 2A3R1, 2A3C2, 2A3AC9,
No replace faulty
2A3AL9 and 2A3AC16 for shorts and/or shorts
component
to ground
24
COUPLER STATUS FAULT indicator went out
Yes step 25
No step 28
25
COUPLER STATUS TUNING indicator illuml-
Yes step26
nated and transmitter is keyed
No. step 29
26
COUPLER STATUS TUNING indicator went out
Yes step 27
and transmitter unkeyed
No step 31
27
Adjust 2A1R4 for approximately a 40 second de-
Delay can be adjusted for 35 to 45 seconds
Yes step2c
lay
No step 140
28
Set mode switch to OFF Remove Control Logic
Meter indicates 1000 ohms or more
Yes step 140
CCA 2A1 Disconnect control cable at Antenna
No step 33
Coupler Connect multimeter between 2A3A-
E21 and ground
29
COUPLER STATUS TUNING Indicator illuml-
Yes step 30
nated
No step 34
30
Set mode switch to OFF Disconnect control cable
Continuity checks, 10 ohms or less
Yes step 140
at Antenna Coupler Remove Control Logic CCA
No step 36
2A1 Continuity check 2Pl-p to 2XA1-7
31
COUPLER STATUS TUNING indicator went
Yes step 32
out
No step 37
32
Set mode switch to OFF Disconnect control cable
Meter indicates 100 ohms or more
Yes step 140
at Antenna Coupler Remove Control Logic CCA
No step 39
2A1 Connect multimeter between 2A3A-E16
and ground
33
Check components 2A3AC5, 2A3AL5 and
Components check good
Yes reinstall Con-
2A3AC20 for shorts and/or shorts to ground
trol Logic CCA
2A1, go to
step 139
No replace faulty
component,
reinstall Con-
trol Logic CCA
2A1
34
Transmitter keyed
Yes step 35
No step 40
4-24
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