HP 8340b - Page 255

A60
PROCESSOR
SELF TEST LEDs
There
are
16
self
test
LEDs
at the
top
of the
A60
assembly
that
turn
on
when
you
switch
the
power
on
or press
[INSTR
PRESET].
If
there
is
no
failure,
all
16
LEDs
light
and
approximately
1
second
later,
turn off.
1.
If
self
test
fails,
cycle
the
line
power
or
press
[INSTR
PRESET]
and
observe
the
processor
self test
LEDs.
All
16
LEDs
turn
on.
After
2
seconds:
A60DS15
and
A60DS16
(the
LEDs
closest
to the
front panel)
turn
off.
A60DS1
through
A60DS14
indicate the failure
(see
Table
F-3).
After
4
seconds:
A60DS9
through
A60DS15
turn
off
and
A60DS16
turns
on.
A60DS1
through
A60DS8
then
indicate
which
I/O
address bus
line
failed
(see
Table
F-3).
After
6
seconds:
If
an
I/O
data
bus
line
fails,
A60DS1
through
A60DS16
indicate
which
failed
(see
Table
F-3).
HP
8340B/41B
A60
Processor Assembly-Level Troubleshooting F-17