HP 8340B Manual 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