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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
35
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 43
2A1 Continuity check 2P1-L to 2XA1-6
36
Check component 2A3L10
Component checks good
Yes step 139
No replace faulty
component
Reinstall Con-
trol Logic
CCA2A1
37
Transmitter unkeyed
Yes step 38
No step 140
38
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 44
2A1 Connect multimeter between 2A3A-E22
and ground
39
Check components 2A3AC10, 2A3AL10,
Components check good
Yes reinstall Con-
2A3AC15, 2A3AC11. 2A3AL11 and 2A3AC14
trolLoglc
for shorts and/or shorts to ground
CCA 2A1, go
to step 139
No: replace faulty
component
Reinstall Con-
trol Logic CCA
2A1
40
Connect multimeter between 2A3A-E17 and
Meter indicates + 28 VDC +1.5 VDC
Yes step 41
ground
No step 45
41
Connect multimeter between 2A3A-E18 and
Meterindicates+28VDC +1.5VDC
Yes step 42
ground Depress and hold TUNE START
No step 49
42
Set mode switch to OFF Remove control Logic
Continuity check good
Yes step 140
CCA 2A1 Continuity check 2A3A-E18 to
No step 139
2XA1-A
43
Check component 2A3AL4A
Component checks good
Yes step 139
No replace faulty
component Re-
install Control
Logic CCA 2A1
44
Check components 2A3AC4, 2A3A1A and
Components check good
Yes step 139
2A3AC21 for shorts and/or shorts to ground
No replace faulty
component Re-
install Control
Logic CCA 2A1
45
Connect multimeter between 2K1-9 and ground
Meter indicates + 28 VDC + 1.5 VDC
Yes step 46
No step 139
46
Connect multimeter between 2K1-13 and
Meter indicates + 28 VDC + 1.5 VDC
Yes step 147
ground
No step 139
47
Set mode switch to OFF Check components
Components check good
Yes step 148
2A3AL7, 2CR4, and 2K1 coil
No replace faulty
component
48
Set mode switch to CPLR TUNE KW
Connect Meter indicates + 28 VDC + 1.5 VDC
Yes step 139
multimeter between 2K1-5 and ground
No replace relay 2K1
49
Set mode switch to OFF Check components
Components check good
Yes step 139
2A3AL8, 2A3AC8, 2A3AC17 and 2A3AL9
No replace faulty
component
50
Set frequency to 1 802 MHz Depress TUNE
Both drive motors, 2M1 and 2M2, drive
Yes step 3b
START
No step 51
51
Drive motor 2M1 drives
Yes step 52
52
Set mode switch to OFF Remove Phase and Am-
No step 59
plitude CCA 2A2
CAUTION
When testing at connector, take care not to short
adjacent connector contacts
CAUTION
Ensure the roller on 2L4 is positioned near center
of travel before beginning the following checks
4-25
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