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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
111
CAUTION
When jumpering pins, take care not to short adja-
cent connector contacts
Set mode switch to OFF Jumper 2XA1-15 to
Meter indicates +9 VDC 0.8 VDC.
Yes: step 112
ground Set mode switch to AM Connect multim-
No: step 125
eter between 2XA6-A and ground
112
Set mode switch to OFF Remove jumper between
Meter indicates 10 ohms or less.
Yes: step 113
2XA1-15 and ground Reconnect connector to
No: step 126
Servo Control Assy Disconnect control cable at
Antenna Coupler Connect multimeter between
2P1-P and 2XA1-8
113
Check components 2C1,2L4, 2T1 and 2R10.
Components check good.
Yes: step 114
No: reinstall removed
components,
replace faulty
component.
114
Check RF transmission line, point to point wir-
RF transmission line wiring checks good
Yes: reinstall
ing.
removed com-
ponents, go
to step 140
No: reinstall removed
components, go
to step 139
115
NOTE
The following test is on a bistable relay The volt-
age when checked, may be either + 28 VDC 1.5
VDC or 0 VDC This depends upon the relay state
when the measurement is made
Connect multimeter between 2A5-E2 and
If recorded meter indication was 0 VDC, then me-
Yes: step 116
ground. Record meter indication Momentarily
ter Indicates +28 VDC 1.5 VDC If recorded
No: step 127
jumper 2XA1-V to ground
meter indication was + 28 VDC 1.5 VDC, then
meter indicates 0 VDC
Yes: step 139
116
Set mode switch to OFF. Check the following
Components check good.
No: replace faulty
components:
component
2K2
2CR5
117
NOTE
The following test is on a bistable relay. The volt-
age, when checked, may be either +28 VDC 1.5
VDC or O VDC This depends upon the relay
state when the measurement is made
Connect multimeter between 2A5-E5 and
If recorded meter indication was 0 VDC, then me-
Yes. step 118
ground. Record meter indication Momentarily
ter indicates + 28 VDC 1.5 VDC If recorded
No: step 128
jumper 2XA1-17 to ground.
meter indication was + 28 VDC 1.5 VDC, then
meter indicates 0 VDC
118
Set mode switch to OFF Check the following
Components check good.
Yes: step 139
components:
No: replace faulty
2K3
component
2CR6
119
Check components 2A3AC3, 2A3AL3 and
Components check good.
Yes: step 139
2A3AC22 for shorts and/r shorts to ground.
No: replace faulty
component
120
Perform Amplitude Detector Adjustment.
Amplitude Detector adjusts to within tolerance
Yes: step 4a
No: step 143
121
Perform Phase Detector Adjustment.
Phase Detector adjusts to within tolerance
Yes: step 4a
No: step 143
122
Connect multimeter across 2S3 - C MIN normal-
Meter indicates less than 10 ohms
Yes: step 139
ly open contacts Activate 2S3 - C MIN.
No: replace 2S3
C MIN limit
switch
123
Connect multimeter across 2S4 - C MAX normal-
Meter indicates less than 10 ohms
Yes: step 139
ly open contacts Activate 2S4 - C MAX.
No: replace 2S4
C MAX limit
switch
4-30
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