HP 8340b User Manual

SELF
TESTS
At
power
on
and at
instrument
preset,
self
test
performs
diagnostic
checks
on some
of
the
instrument
circuitry.
The tests
performed
are
the SHIFT M4
tests
0
through
8,
and
10
through
13
(described
under
SHIFT
M4).
Figure
F-2 shows
the
instrument
self
test
flow
chart.
How
to
Check
the
Results of
Self
Test
You
can
check
the
results
of
instrument
self
test
in
3
ways:
•
On the
INSTR CHECK LEDs
I
and
II
•
Using
the
A60
Processor
Self
Test
LEDs
•
Using
the
diagnostic
SHIFT
M4
NOTE:
The
most accurate
failure
indication
is
given
by
the
A60
processor
self
test
LEDs.
A
failure
can
occur
that
invalidates
the
indication
of the
INSTR
CHECK
LEDs
and
SHIFT
M4.
Instrument
CHECK
LEDs
I
and
II
The
INSTR CHECK LEDs
I
and
II
are
the
easiest
failure
indicators to check
because
they
are
located
on
the
front
panel,
adjacent to
the
[INSTR PRESET]
key.
Procedure
1.
Switch
on
power
or
press
[INSTR
PRESET].
Both INSTR
CHECK
LEDs
turn
on.
LED
I
turns
off
when
the
processor,
memory,
and peripheral interface
timer
(on the
A60
assembly)
pass
self
test
(SHIFT
M4
tests
0
through
6,10,
and
11).
LED
II
turns
off
when
the
I/O
address
bus,
I/O
data
bus,
and
marker
RAM
pass
self
test
(SHIFT
M4
tests
9,12,
and
13).
If
no
failure
occurs,
both
LEDs
are
off
after
approximately
1
second.
If
either
LED
remains
on,
check
the
16
LEDs
on
the
A60
assembly.
Remember
that
it
is
possible
for
a
failure
to
occur
that
causes
both
INSTR
CHECK LEDs
to
go
off
when
they shouldn't.
HP 8340B/41B A60
Processor Assembly-Level
Troubleshooting
F-15

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English