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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
93
Set mode switch to OFF Remove Control Logic
CCA2A1
CAUTION
When testing at connectors, take care not to short
adjacent connector contacts
Set mode switch to AM. Momentarily jumper
Relay 2K2 changes state
Yes: step 94
2XA1-V to ground
No: step 115
94
Again momentarily jumper 2XA1-V to ground
Relay 2K2 changes to the state opposite that of
Yes: step 95
step 94
No: replace relay
2A5K1
95
Momentarily jumper 2XA1-17 to ground
Relay 2K3 changes state
Yes: step 96
No: step 115
96
Again momentarily jumper 2XA1-17 to ground
Relay 2K3 changes to the state opposite that of
Yes: step 97
step 96
No: replace relay
2ASK2.
97
Set mode switch to OFF Insure 2L4 roller is not
Meter indicates 300 ohms or more
Yes: step 98
touching L MAX plunger
No: step 139
98
Rotate inductor 2L4 to position roller against L
Meter indicates 5 ohms or less
Yes: step 99
MAX plunger(2S1)
No: step 139
99
Check components 2C6A-B-C-D-E and
Components check good
Yes: step 100
2C3A-B
No: replace faulty
component
Reinstall
removed
components.
100
Continuity check the following
Continuity checks good
Yes: reinstall re-
2K2 contact to 2C6
moved com-
2C6 to ground
ponents; go
2K3 contact to 2C3
to step 140
No: step 139
101
Set mode switch to OFF Remove Control Logic
Meter indicates 10 ohms or less.
Yes- reinstall re
CCA 2A1 Disconnect control cable from Antenna
moved com-
Coupler. Connect multimeter between 2P1-N
ponents; go
and 2XA1-N
to step 140
No: step 117
102
Check Amplitude Detector Adjustment Refer to
Amplitude Detector is within tolerance.
Yes: step 103
Section IV - Maintenance
No: step 120
103
Check Phase Detector Adjustment Refer to Sec-
Phase Detector is within tolerance.
Yes. step 104
tion IV - Maintenance
No: step 121
Yes: step 105
104
Check 2K4, 2C4, 2R3, 2R4, 2R5, 2R6, 2R7 and
Components check good
No: replace faulty
2R8
component.
105
Check motor drive belts for 2Ml/2C1 and
Drive belts are m good condition and function
Yes: step 106
2M2/2L4
properly.
No: replace drive
belts as
required.
106
Set mode switch to OFF Remove Phase and-Am-
Meter indicates 10 ohms or less.
Yes: step 107
plitude CCA 2A2 Connect multimeter between
No: step 122
2XA2-8 and ground Activate 2S3 - C MIN
107
Connect multimeter between 2XA2-11 and
Meter ndicates10 ohms or less.
Yes: step108
ground Activate 2S4 - C MAX
No: step 123
108
Continuity check the following
Continuity checks good.
Yes. step 109
2S1-L MAX to 2XA2-7
No: reinstall removed
2S2-L MIN to2X2A-15
components, go
to step 139
109
Reinstall Phase and Amplitude CCA 2A2 Check
Limit switch adjustments check good
Yes: step 110
limit switch adjustments (refer to Section IV -
No: perform neces
Maintenance) for the following-
sary limit switch
2S1- L MAX
adjustments;
2S2 - L MIN
go to step 4a.
2S3 - C MIN
2S4 - C MAX
110
Remove Control Logic CCA2A1 Disconnect con-
Meter indicates +22VDC 1.5 VDC
Yes: step 111
nector from Servo Control Assy 2A6 Set mode
No: step 124
switch to AM Connect multimeter between
2XA6-A and ground
4-29
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