Quantcast Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92--Continued - TM-11-5820-873-340074

 

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Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92--Continued - TM-11-5820-873-340073
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TM-11-5820-873-34 Radio Set AN/URC-92 (NSN
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Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92--Continued - TM-11-5820-873-340075


TM 11-5820-873-34
Table 4-3. Checkout/Troubleshoot the Antenna Coupler CU-2229/URC -92--Continued
STEP
ACTION
INDICATION
NEXT STEP
NOTE
For steps requiring jumpers, remove jumper be-
fore motor drives to end stop
Set mode switch to AM Momentarily jumper
Motor 2M2 rotates clockwise (viewed from shaft
Yes step 53
2XA2-V to ground
end)
No step 67
53
Momentarily jumper 2XA2-17 to ground
Motor 2M2 rotates counterclockwise
Yes step 54
No step 68
54
Connect VTVM between 2XA2-U and ground
Meter indicates + 10 VDC + 0.8 VDC
Yes step 55
55
CAUTION
No step 139
Ensure VTVM Is isolated from ground
Connect VTVM between 2XA2-16 and 2XA2-U
Meter indicates a voltage difference (+ or -)
Yes step 56
No step 70
56
Set mode switch to CPLR TUNE KW Connect
Meter indicates + 3 VDC to + 5 VDC
Yes step 57
VTVM between 2XA2-14 and ground Depress
No step 71
and hold TUNE START
57
Set mode switch to OFF Connect multimeter be-
Meter indicates 200 ohms or more
Yes step 58
tween 2XA2-7 and ground
No step 72
58
Connect multimeter between 2XA2-15 and
Meter indicates 1000 ohms or more
Yes step 141
ground
No step 74
59
Drive motor 2M2 drives
Yes step 60
No step 75
60
Set mode switch to OFF Remove Phase and Am-
plitude CCA 2A2
CAUTION
When testing at connectors, take care not to short
adjacent connector contacts
CAUTION
Ensure the 2C1 sensor bar is positioned near cen-
ter of travel before beginning the following
checks
NOTE
For steps requiring jumpers, remove jumper be-
fore sensor contacts micro switches
Set mode switch to AM Momentarily jumper
Motor 2M1 rotates clockwise (viewed from shaft
Yes step 61
2XA2-4 to ground
end)
No step 78
61
Momentarily jumper 2 XA2 -5 to ground
Motor 2M 1 rotates counterclockwise
Yes step 62
No step 84
62
Connect VTVM between 2XA2-3 and ground
Meter indicates + 10 VDC + 0.8 VDC
Yes step 63
63
CAUTION
No step 139
Ensure VTVM Is Isolated from ground
Connect VTVM between 2XA2-2 and 2XA2-3
Meter indicates a voltage difference (+ or -)
Yes step 64
No step 81
64
Set mode switch to CPLR TUNE KW Connect
Meter indicates + 3 VDC to + 5 VDC
Yes step 65
VTVM between 2XA2-6 and ground Depress
No step 82
and hold TUNE START
65
Set mode switch to OFF Connect multimeter be-
Meter indicates 1000 ohms or more
Yes step 66
tween 2XA2-8 and ground
No step 83
66
Connect multimeter between 2XA2-11 and
Meter indicates 1000 ohms or more
Yes step 141
ground
No step 84
67
Connect VTVM between 2XA2-T and ground
Meter indicates 0 VDC + 0.5 VDC
Yes step 68
No reinstall removed
components, go
to step 141
68
Set mode switch to OFF Disconnect connector
Meter indicates less than 50 ohms
Yes step69
from Servo Control Assy 2A6 Connect multlm-
No replace motor
eter between 2M2-1 and 2M2-2
2M2 Reinstall
removed
components
69
Continuity check the following
Continuity checks good
Yes step 142
2XA2-V to 2XA6-C
No reinstall removed
2XA2-17 to2XA6-H
components, go
2XA6-B to 2M2-1
to step 139
2XA6-E to 2M2-2
4-26


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