HP 8340b User Manual

HP
8340B/41B
Assembly-Level
Service
After
Service
Safety
Checks
VISUAL
INSPECTION
Visually
Inspect
the
interior
of the
instrument
for
any
signs
of
abnormal
internally
generated
heat,
such
as
discolored printed
circuit
boards
or
components,
damaged
insulation,
or
evidence
of
arcing.
If
you
find
any
signs
of
abnormal
heat,
determine
and
remedy
the
cause.
CHECK LINE CORD
GROUND
Using a
suitable
ohmmeter,
check
the
resistance
from
the
instrument
enclosure
to the
ground
pin
on
the
power
cord
plug.
The
reading
must
be
less
than
1t2. Flex
the
power
cord
while
making
this
measurement
to
determine whether
intermittent discontinuities
exist.
If
the
resistance
is
greater
than
1A,
replace
the
faulty
line
cord.
CHECK
THE LINE/NEUTRAL
With
the
instrument disconnected
from
line
power,
and
the
line
switch
on,
check
the
resistance
from
the
instrument
enclosure
to the
line
and
neutral
(tied
together).
The
resistance
must
be
at least
2
Ma.
If
the
resistance
is
less than
2
Mf2,
DO
NOT
CONNECT THE
INSTRUMENT TO
LINE
POWER!
Troubleshoot
the
source
of
the
problem.
CHECK THE
LINE FUSE
Verify
that
a
correctly
rated
fuse
is
installed,
and
the
line
module voltage selector
cam
is
set
properly.
HP
8340B/41B
Assembly-Level
Service
After
Service
Safety Checks
A-51

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English