TM 11-6625-3081-23
7-21. PHOTOMULTIPLIER BRACKET ASSEMBLY 2A1A1A7 AND PHOTOMULTIPLIER TUBE
(PMT/LED SOURCE)
7-21
INPUT CODE:
PMTLED (cont)
c. SEGMENT 1
1. VDT DISPLAY
PMT TEMPERATURE ERROR.
PERFORM THE FOLLOWING REPLACE ACTIONS IN THE ORDER
LISTED.
(REFERENCE TM 11-6625-3081-23 FOR REPLACEMENT PROCEDURES.)
REF. DES.
PART NO.
NAME
1.
1A7
MODEL 33-2124
PMT CONTROLLER
2. 2A2A7A6A4
13082738
TEMP. MONITOR CCA
3. 2A2A13XX
AC4720
DIFF. INPUT CCA (J4)
4. 2A2A13
13081746
A/D CONVERTER
5. 2A1A1A1A7
13083875
PMT BRACKET (SENSOR Q1)
6. 2A1A1A1A7
13083875
PMT BRACKET (PMT)
2. CORRECTIVE ACTION - SEGMENT 1
(a) Remove Photomultiplier Tube (PMT) Controller 1A7. Check contacts of
mating connectors and repair if required.
Install replacement 1A7 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.
(b) Remove Temperature Monitor CCA 2A2A7A6A4. Check contacts of mating
connectors and repair if required.
Install replacement 2A2A7A6A4 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.
(c) Remove Differential Input CCA 2A2A13XX (slot J4). Check contacts of
mating connectors and repair if required.
Install replacement 2A2A13XX
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.
(d) Remove A/D Converter 2A2A13.
Check contacts of mating connectors and
repair if required.
Install replacement 2A2A13 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.
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