HP 8340b - Page 523

Transformer
Installation
1. Reverse
the
above
procedure.
NOTES:
When
you
reverse
step
4a,
do
not
allow
the
transformer secondary wires
to
touch
adjacent
A62
motherboard
lugs.
Ensure
that
the white
transformer
secondary
wire pair
is
reattached
to
the
A62
motherboard
lug
labeled
(9).
DO
NOT
attach
it
to
the
taller,
unmarked
lug.
When
reversing
step
4a,
ensure
the
blue
transformer secondary
wires
are
completely
inside
the
plastic
clamp.
If
the
plastic
clamp hardware
is
mounted
in
the
wrong
side
panel
hole,
the
A19
assembly
will
not
go
back
in
place.
Reinstall the
A19
capacitor assembly
as
follows:
1.
Lift
the
two
grey
cables out
of the
way.
2.
Lower
the
A19
assembly flange-end
first
until
the
finger
contact
end
drops
in
place.
3.
Lift
up
slightly
on
the
flange-end,
and
push down
on
the
finger
connector
side
until
the
fingers
are
fully
seated.
LINE
MODULE REPLACEMENT
Read
the
entire procedure
before
you
start!
Line
Module
Removal
Refer
to
Figure
1-6.
1.
Ensure
that
the
main
line
fuse
and
the
selected
line
voltage
are
correct.
2.
Disconnect
line
power,
and
remove
the
instrument top
and bottom
covers.
3.
Wait
for
the
A19
power-on
safety
indicator
to
go
out.
4.
Remove
the
portion
of the
rear
panel
that holds
the line
module:
a.
Remove
two
screws
(item 12).
b.
Invert
the
instrument and
remove
three
rear
panel
screws
(item
7).
c.
Remove
the
A35
assembly
protective
cover.
d.
Remove
three
rear
panel
screws
(item
13).
e.
Remove
the
fan.
f.
Remove
three
rear
panel
screws
(item
8).
g.
From
inside the
instrument,
push
the
rear
panel
out.
5.
Desolder
all
wires
from
the
line
module.
HP
8340B/41B
power
Supplies/Fan
Repair Procedures
1-19