Hp Support Troubleshooting Procedures - HP 3000 Series Installation And Service Manual
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Also See for 3000 Series:
- Handbook (280 pages) ,
- Installation and service manual (80 pages) ,
- Installation manual (42 pages)
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Ma
intenance
5-14. 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 5-2, "Repair Philosophy".)
When the HP Customer Engineer arrives at the computer
site,
the
recommended troubleshooting sequence is as follows:
a.
Determine that the INP 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 5-1
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 modern 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 sw itch (figure 5-1) to initiate
the
self test.
e.
Observe the INP self-test LEDs.
(Refer
to
table
5-1
for
interpretation
of
the meaning of the various LED light pat-
te rns.)
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
be ing
displayed
by
LEDs
7
through
4
and compare this pattern with
the information shown
in
table
5-2.
(If
LED
3
is
not
lighted, skip steps g through h and go directly to step i.)
g.
Replace the
RAM
chip that was
identified
in
table
5-2
as
being
defective.
(See paragraph 5-17, "Field Replacement of
a
RAM
Ch i p " • )
h.
Repeat steps d through g (to cover the possibility that
more
than one RAM chip had failed simultaneously).
i.
If the LED 7-6-1-0 combination is lighted, one of the parity-
bit RAM chips has failed.
Replace both parity-bit RAM
chips
(U127
and U128).
(See paragraph 5-17, "Field Replacement of
a RAM Ch ip " • )
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Table of Contents
Troubleshooting
