TM 11-6625-3081-23
7-21. PHOTOMULTIPLIER BRACKET ASSEMBLY 2A1A1A7 AND PHOTOMULTIPLIER TUBE
(PMT/LED SOURCE)
7-21
INPUT CODE:
PMTLED (cont)
2. CORRECTIVE ACTION - SEGMENT 4
(a)
(b)
(c)
(d)
(e)
7-108
Remove Digital Output CCA 2A2A6XX (slot 408). Check contacts of mating
connectors and repair if required.
Install replacement 2A2A6XX and
perform PMTLED test.
If PMTLED test passes, no further action
required.
If this segment displayed again, proceed to (b). If another
segment displayed, proceed to that segment and continue
troubleshooting.
Remove Digital Output CCA 2A2A6XX (slot 409). Check contacts of mating
connectors and repair if required.
Install replacement 2A2A6XX and
perform PMTLED test.
If PMTLED test passes, no further action
required.
If this segment displayed again, proceed to (c). If another
segment displayed, proceed to that segment and continue
troubleshooting.
Remove Electrical Filter Interface 2A1A1A1A8.
Check contacts of mating
connectors and repair if required.
Install replacement 2A1A1A1A8 and
perform PMTLED test.
If PMTLED test passes, no further action
required.
If this segment displayed again, proceed to (d). If another
segment displayed, proceed to that segment and continue
troubleshooting.
Remove PMT Shutter Assembly 2A1A1A1A7XX. Check contacts of mating
connectors and repair if required.
Install replacement 2A1A1A1A7XX and
perform PMTLED test.
If PMTLED test passes, no further action
required.
If this segment displayed again, proceed to (e). If another
segment displayed, proceed to that segment and continue
troubleshooting.
Check the following cable assemblies and repair as required:
W27
W28
2A1W26
2A1W32
2A1A1W9
2A1A1W11
If any cable was repaired, perform PMTLED test. If PMTLED test passes,
no further action required.
If PMTLED test fails and CALCST, PLLBUS,
MTRXSW, ADST, DIGITST, FPSST, and PPSST tests have been performed,
repair is beyond this level of maintenance.
Next higher level of
maintenance required.
If no cables were repaired and CALCST, PLLBUS, MTRXSW, ADST, DIGITST,
FPSST, and PPSST tests have been performed, repair is beyond this level
of maintenance.
Next higher level of maintenance required.
If another segment displayed, proceed to that segment and continue
troubleshooting.
