HP 8340b User Manual

SHIFT
M4
When
to Use
SHIFT M4
After
you
have determined
the failure
mode
(using
the
processor
self
test
LEDs
and
Table
F-3),
you
can
use
the
SHIFT
M4
diagnostic
to further
isolate
the
failure.
This
service
diagnostic
tests
DACs
and
control
circuitry
in
the
instrument,
and allows
the
results of
the self
test
to be displayed
in
the
front panel
ENTRY DISPLAY.
What
SHIFT M4
Does
SHIFT
M4
does
not
perform exhaustive
DAC
tests,
but
provides
an
indication
to
direct
your
troubleshooting
to
a
specific
device
or
circuit
path.
Table
F-4
lists
all
the
tests performed
when
you
press
[SHIFT]
[M4].
As
you can
see,
this
service
diagnostic tests
more
than
just
the
A60
assembly.
All
of the
tests
are
listed
because
only
one
test
(0) is
not dependent
on
the
test
results
of
one
or
more
of the
other
tests.
The
Interdependence
of
the
SHIFT
M4
Tests
Table
F-5
illustrates
the
interdependence
of the
SHIFT
M4
tests.
The vertical
axis
(Test
Number)
lists
the
tests,
0
through
31.
The
horizontal axis
(Dependent
On)
lists
the
test
numbers
and indicates
which
test(s)
must
pass
for
a given
test
result to
be
valid.
An
X in
a
Dependent
On
column
indicates
that
a
given
test
is valid
only
if
the
test
in
that
column
also
passes.
Example:
Test
11
is
only
valid
if
tests
0, 5,
and
6
pass.
If
test
11
fails,
verify
that
tests
0,
5,
and
6
have passed
before
troubleshooting
the
assembly
exercised
in
test
11.
SHIFT
M4
Test Procedure
1.
Press
[SHIFT]
[M4].
While
the
tests
are running,
the
ENTRY
DISPLAY
shows
DIAGNOSTIC TESTS
IN
PROGRESS.
When
the
tests
are
through,
the
instrument
displays
TEST:?FULL
DIAGNOSTIC
and then
displays
PASS
or
FAIL.
PASS
indicates
that
all
of
the
tests
related
to
this
diagnostic
have
passed.
FAIL
indicates
that
one or more
of the
tests
failed.
2.
If
the
display indicates
FAIL,
use
the
RPG
or
the
step keys
to
move
through
the
test results
and
determine
which
test(s)
failed.
HP 8340B/41B
A60
Processor Assembly-Level Troubleshooting F-19

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English