IBM 3278 Series Maintenance Information page 19

2
If a failure was sensed while the 3278
PDG
was
being used, the failing step number was record-
ed on a problem report form (GX23-0201,
or GXl8-1033 for Japanese English or
Katakana; see Figure 1-3). This step number
will be useful when the MAPs are being used.
3. If the failure is intermittent, cards and cable
connectors should be checked for correct
seating, and voltages should be checked for
correct tolerances as described in MAP 01.
Check the tightness of the screws on the capa-
citors in the low-voltage power supply.
4. The 3278 should be online to its control unit
unless the MAP instructs you to place the
3278 offline. If the 3278 is offline (in Test
mode), some of the symptoms may differ
from those for which the MAPs were designed.
5. The MAPs will instruct you to reseat/swap
cards in a specific sequence. The first card is
the first probable cause of the failure, the next
card is the next probable cause, etc.
6. Always res eat the cards and their associated
cables, and test before swapping parts. Reseat
the cables, and check the capacitor screws for
tightness before swapping the low-voltage
power supply.
7. When the analog card (card 01 A-H2) is swapped,
the new card may need adjustment.
8. Always reinstall the original part when the
new part did not repair the problem.
9. If you go through the MAP once without
repairing the problem, go back to the starting
point and go through the MAP a second time.
If, after a second pass through the MAPs, the
trouble is not repaired, call for assistance.
10. The ECScard 01A/AlD02 (0) or O1A/A1E2
(M) may contain a pluggable APL/Text char-
acter generator ROS module. Static discharge
can damage the ROS module if you do not
follow proper grounding procedures when
handling a loose module, that is, one not in-
stalled in a card socket. Hand contact should
first be made to the foam or wrapping in which
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