HP 8340b User Manual

Power
Supplies/Fan
Assembly-Level
Troubleshooting
WARNING
When the
instrument
is
connected
to
ac
line
power
and/or
the
A19
power-on
safety
indicator
LED
is
on,
there
are
voltages
present
inside
the
instrument
that
can cause
personal
injury
or death.
Only qualified
personnel,
who
are
aware
of the
hazards involved,
should
perform
ser¬
vice
on
this
instrument
with
its
protective
covers removed.
To avoid
non-repairable
damage
to
assemblies,
do
not
reinstall the
A19,
ASS, A52,
or
ASS
assemblies
unless
ac
mains
is
disconnected from the
instrument.
To
protect
static sensitive
components,
troubleshoot
these
assemblies
only
at
a
work
station
equipped
with
an
anti-static
surface,
and
wear
a
grounding
strap.
When
handling
a
printed circuit
board,
hold
it
by the
edges;
never
touch
the
finger
contacts.
INSTRUMENT
BLOWS LINE FUSE
Initial
Checks
1.
Ensure
that
the
line
voltage selector
cam
is
installed
in
the
line filter
module
with
the
proper
voltage
selected.
2.
Check that the
proper
value fuse
is
installed
for
the
selected
line
voltage.
Regulator Checks
1.
Remove
line
power
and
wait for
the
A19
power-on
safety
indicator to
go
out.
2.
Remove
the
A52
regulator
assembly.
3.
Reconnect
line
power
and
turn
on
the
instrument.
4.
If
the
fuse
blows,
repeat
the
above
procedure,
removing,
one
at
a
time,
the
ASS,
ASS,
and
A19
assemblies.
5.
If
the
fuse
blows
with
all
these
assemblies
removed,
suspect
the
A62
motherboard, or
the
transformer
itself.
6.
If
the
line
fuse
does not blow
after
you
remove
one
of the
assemblies,
replace
or
troubleshoot
that
assembly.
HP 8340B/41B
Power
Supplies/Fan Assembly-Level Troubleshooting
1-9

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English