Fan Replacement - HP 8340B Manual
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6.
The
line
module
is
held
in
by four plastic retainers and two metal
clips.
The
metal
clips
are
NOT
part of the
line
module and must be removed before the
line
module can be removed:
a.
To release the metal
clips, using wire
cutters, cut the plastic retainers
away
at the base,
flush
with the body
of the
line
module,
well
away
from the tops of the metal clips.
The
metal clips do
not
come
off
if
any plastic remains.
b.
With
a
flat head screwdriver, pry the metal clips
away from
the line module; lay them
down
as
far as possible.
c.
Remove and
discard the metal clips; remove the
line
module.
Line Module Installation
1.
Select and
install
the
proper fuse
in
the fuse holder.
2.
Set the
line
voltage selection cam to
the
proper
line
voltage.
NOTE:
The cam
does
not turn.
To change
the line voltage selection,
remove
the
cam from the power
line
module and replace
it in
the proper position.
3.
Place the metal retainers
(HP
part number
02932-00038)
on the
line
module, the portion of the
clip
that
is
bent 90° (at each end of the clip) should
fit
under the plastic retainers on
the
line
module.
4.
When you
insert
the
line
module
in
the rear panel, ensure the
line
cord receptacle
is
on the side
farthest from the instrument fan.
5.
Push the
line
module
in
firmly until
all clips
engage
on the inside of the rear panel.
6.
Wire the
new
line
module as shown
in
Figure
1-4.
Reinstall the
rear
panel by reversing step
4
of the
line
module removal procedure.
FAN REPLACEMENT
Fan Removal
Refer
to Figures l-5a and
1-6.
1.
Disconnect
line
power,
and
remove
the instrument top and bottom covers.
2.
Wait
for the A19
power-on safety indicator (red LED) to
go out. This indicator
is
visible from the
top
of
the
instrument with
the
cover removed.
3.
Remove the A35 assembly
protective cover (item
10),
the
A35 assembly,
and the nearby capacitor
cover
(item
11, in
two pieces).
4.
Disconnect the
fan cable from
J30
(located on the motherboard assembly.
5.
Remove two screws
(item
12) from
the rear panel frame (top).
6.
Remove three screws
(item 13) from the rear panel
frame
(bottom). Note the location of
the ground
lug and
of
the small metal grounding plate.
7.
Remove
the four
screws
(item 13a)
located on the rear panel. The fan assembly can now be
separated from the instrument frame.
1-20
Power Supplies/Fan Repair Procedures
Change
4
HP 8340B/41B
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