Boot ROM Error Codes (Cont'd)
Hexadecimal
LEDs Equivalent Probable Failure What
to
Do
.00
•
•••
0
9E
Alpha Display Replace Video Board
Controller Failed
•
00.
••••
9F Graphics on Replace Video Board
Alpha/Graphics
Controller Failed
.0XX
XXXX
90
to BF
I/O
Card
at
XXXXX Replace
I/O
Card
at
Select
Failed
Code XXXXX
Replace Processor Board
Replace
I/O
Backplane
••••
••••
FF LEDs Never Accessed Check
-12
V.
If
okay,
replace
Processor Board. Otherwise,
replace
Power Supply.
Remote System Analysis
The
Model
HP
98561A/B
computers
provide for remote
system
analysis
of
problems by
means
of
the
beeper. To diagnose
the
computer
remotely, follow
this
procedure:
1.
Establish
a telephone connection
with
someone
at
the
location of
the
computer.
2.
Have
them
hold
the
receiver
near
the
speaker
output
of
the
computer.
The
speaker
is
located in 35731, 35741
and
98781 monitors,
or
in
the
speaker
module.
3. Now have
them
turn
the
computer
on.
4.
The
computer
will go
through
its
self
test
and
report
problems
as
a series
of
beeps.
These
beeps
correlate
with
the
above
error
codes.
5.
The
beeper
annunciates
the
seven least significant bits. A high
beep
indicates a one
and
a low beep indicates a zero.
For
example,
suppose
that
on
power-up a
computer
emits
three
low beeps, a high beep, two low
beeps
and
a high beep.
This
will
be
of
the
form:
Xo
0 0
.00.
(09
or
89 hexadecimal)
where
0 represents a low beep, • represents a high beep
and
X represents
an
unbeeped
high
or
low. Referring
to
the
table
of
Boot
ROM
Error
Codes leads us
to
RAM
Failure
as
the
probable
cause.
Diagnostics
31
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