TM 11-6625-3081-23
7-26. ANALOG-TO-DIGITAL (A/D) CONVERTER 2A2A13
7 - 26
INPUT CODE: ADST (cont)
h. SEGMENT 6
1. VDT DISPLAY
SINGLE ENDED INPUT CARD SLOT J7 FAILED.
PERFORM THE FOLLOWING REPLACE
ACTIONS IN THE ORDER LISTED.
(REFERENCE TM 11-6625-3081-23 FOR REPLACEMENT
PROCEDURES.)
REF. DES.
PART NO.
NAME
1. 2A2A13XX
AC4720
DIFF. INPUT CCA (J7)
2. 2A2A11XX
HP69433A
RELAY READBACK CCA (SLOT 400)
3. 2A2A13
13081746
A/D CONVERTER
4. 2A2A1O
13081925-19
MATRIX SWITCH
2. CORRECTIVE ACTION - SEGMENT 6
(a) Remove Differential Input CCA 2A2A13XX (J7). Check contacts of mating
connectors and repair if required.
Install replacement 2A2A13XX and
perform ADST test.
If ADST 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 Relay Readback CCA 2A2A11XX (slot 400). Check contacts of mat-
ing connectors and repair if required.
Install replacement 2A2A11XX
and perform ADST test.
If ADST test passes, no further action
required.
If this segment displayed again, proceed to (c). If another
segment displayed, proceed to that segment and continue trouble:
shooting.
(c) Remove A/D Converter 2A2A13.
Check contacts of mating connectors and
repair if required.
Install replacement 2A2A13 and perform ADST test.
If ADST test passes, no further action required.
If this segment dis-
played again, proceed to (d).
If another segment displayed, proceed to
that segment and continue troubleshooting.
(d) Remove Matrix Switch 2A2A10.
Check contacts of mating connectors and
repair if required.
Install replacement 2A2A1O and perform ADST test.
If ADST test passes, no further action required.
If this segment dis-
played again, proceed to (e).
If another segment displayed, proceed to
that segment and continue troubleshooting.
Change 6
7-135
