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Maintenance
The self test checks most of the circuitry of the !NP PCA
board.
If, upon completion of the self test, the self-test LED indicator
lights (figure 4-1) are displaying 0 and 7 (only the
two
lights
at
each
end
are lighted), there is no detectable hardware mal-
function within the INP PCA board.
If any other
combination
of
lights
is
being displayed or if you still suspect a malfunction
beyond the physical limits of the PCA boards, call your
Hewlett-
Packard Customer Engineer (CE).
4-14. HP Support Troubleshooting Procedures
More extensive troubleshooting can be done
by
the
HP
Customer
Engineer
by
using the support-user interactive dialogue of DSM.
When support-user diagnostic testing of the INP identifies a mal-
function within the INP PCA board, field repair of the
board
is
limited
to
the
replacement
of
the Random Access Memory (RAM)
chips.
Any other malfunction must be
remedied
on
an
exchange
basis.
(See paragraph 4-2, "Repair Philosophy".)
When the HP Customer Engineer arrives at the computer
site,
the
recommended troubleshooting sequence is as follows:
a.
Determine that the !NP is not currently in use.
b.
Before initiating any other action, open
the
computer
card
cage
door and observe the INP self-test LEDs (see figure 4-1
for the location of the LEDs).
Note
whether
the
LEDs
are
flickering or a static pattern is being displayed, and make a
written record of which LEDs are lighted.
This
information
may
be
needed later if the problem persists beyond the ini-
tial steps of troubleshooting.
c.
Disconnect the modem cable (or the direct-connect cable) from
the edge connector of the INP PCA board to physically isolate
the INP subsystem for testing.
d.
Press the manual RESTART switch (figure 4-1) to initiate
the
self test.
e.
Observe the INP self-test LEDs.
interpretation
of
the
meaning
patterns.)
(Refer
to
table
4-1
for
of
the
various
LED light
f.
If LED 3 is lighted in combination
with
any
of
the
other
LEDs,
a
RAM
data
chip failure is indicated.
To determine
which RAM chip is defective, note
the
light
pattern
being
displayed
by
LEDs 7 through 4 and compare this pattern with
the information shown
in
table
4-2.
(If
LED
3
is
not
lighted, skip steps g through hand go directly to step i.)
4-7
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Table of Contents
Troubleshooting
