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
SY27-2510-6
(1/81)
1-7
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