6.
Repeat
steps
4
and
5 until
the
bus
expander's
accessory
card
passes self-test.
If
the
accessory
card
does
not
pass self-test,
either
the
accessory
card
or
the
bus
expander
is
defective. In
this
case,
repeat
steps
6
and
7 using
another
accessory card.
Before you can proceed further,
the
minimum configuration
must
work.
If
this
configuration
works,
then
you
can
proceed
to
the
next
level, Functional
Unit
Troubleshooting.
Functional
Unit
Troubleshooting
A functional
unit
is one
that
passes
the
minimum configuration test.
It
doesn't
have
to
function
properly,
but
at
least
start
the
self-test
and
light
the
LEDs for
the
computer. For
the
bus
expander, one accessory
card
must
at
least pass self-test.
For
the
computer
to
pass
the
minimum
computer
configuration functions correctly,
the
LED's
should
end
up as:
••••••••
Once
the
cornputer minimum configuration self-test passes, you're ready
to
start
testing
with
an
Intermediate
Configuration.
Intermediate
Configuration
There
are several ways
to
configure
the
computer
for
intermediate
level troubleshooting in Func-
tional
Unit
procedures. A good place
to
start
is
by having memory configured
to
address
at
the
top
of
RAM.
This
will verify
that
more of
the
processor
board
is working.
The
procedures are:
1.
Turn
off
the
computer, unplug it,
and
reconnect
the
ribbon
cables
to
the
backplane.
2.
If
required, install a memory
card
configured for
the
top
of
RAM.
~t
Plug
the
computer
in,
turn
it
on
and
watch
the
LED's
go
through
self-test.
4.
If
the
LED
pattern
is
correct, skip
to
Step
6.
If
the
pattern
is
incorrect,
either
the
backplane
or
the
processor is bad. Power down
and
relocate
the
melllory
card
in
another
accessory slot,
then
retest.
If
necessary,
run
the
test
with
the
rnemory
card
in each accessory slot.
5.
If
the
LED
pattern
is
correct, skip
to
Step
6.
If
the
pattern
is incorrect,
either
the
backplane
or
processor is bad. Replace each one
and
retest until
the
correct
LED
pattern
is
achieved.
6.
Power down
and
unplug
the
computer. Install a video
board
and
connect
it
to
a monitor.
Turn
on
the
n10nitor.
7.
Turn
on
the
cornputer. Watch
the
self-test display on
the
monitor.
Troubleshooting
109
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