HP 8340b User Manual

All
LEDs
Off.
Fan
is
Operating.
If
all
annunciators
and
LEDs
are
off
(but
the
instrument's
fan
is
operating),
check
that the fan
is
supplying proper
airflow
to
the
interior
of the
instrument.
Ensure
that the
fan
filter
is
not
blocked.
If
the
airflow
is
good,
suspect
a
failure
in
the
instrument's
power
supply
section.
Fan
is
Not
Operating.
Refer
to
the
FAN
section,
below.
Some
LEDs
Off
If
some
LEDs that
should be
on
are
off,
the front
panel
section
is
probably
faulty.
All
LEDs
On
If
all
of
the
LEDs
and
annunciators
are
on,
instrument
processor, memory,
or power
supply
is
proba¬
bly
faulty.
Character
March
If
the
four
display
windows have
strings
of
characters
marching
across them,
the
instrument pro¬
cessor or
memory
is
probably
faulty.
INSTRUMENT
APPEARS
DEAD
(2)
Fan
is
not Operating,
LEDs
Off
at Power
On
If
all
instrument
LEDs
are
off
and
the
fan
is
not
operating,
suspect
a
problem
in
the
instrument
causing
complete
loss
of
line
power
(line
filter
module,
fuse,
transformer, or
wiring,
related
problems).
Check
the
line
fuse and
line
filter
module
voltage select
cam
(see
POWER SUPPLIES
—
FAN
functional
group).
FAN RUNS
SLOWLY,
ALL
LEDS
ON
(But
are
dim)
Check that the
proper
voltage
has
been
selected
on
the
line
module
(see
POWER SUPPLIES
—
FAN
functional
group).
FAN (3)
Fan
Does
Not
Turn
On
When
the
power
switch
is
turned
on,
the
instrument
fan
should
start.
If
not,
the
fan,
power
supply,
or
K1
relay
(inside
the
instrument,
near
the
rear
panel)
is
probably
faulty.
If
the
instrument
has
run
for
some
time with
the
fan
not
running,
the interior
temperature may
have
risen to
the
point that the
A62S1
thermal switch has
turned
the
instrument off.
If
so,
all
front
panel
LEDs
will
have
gone
off.
The switch
will
reset
itself
when
the
instrument
cools
down.
HP 8340B/41B
Assembly-Level Service
Overall
Instrument
Troubleshooting
A-37

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English