HP 8340b User Manual

Power
Supplies/Fan
Repair
Procedures
TRANSFORMER REPLACEMENT
Transformer
Removal
Refer
to
Figure
1-6.
1.
Disconnect
line
power,
and
remove
the
instrument top
and
bottom
covers.
2.
Wait for
the
A19
power-on
safety
indicator to
go
out.
3.
Remove
the
A19
capacitor
assembly:
a.
Remove
two
flange
screws
(item
1).
b.
Remove two
side
panel
screws
(item
2).
4.
Disconnect transformer wires
from
the
A62
motherboard:
a.
Remove
the
seven screws
(item
3)
connecting
the
transformer secondary
wires
to
the
motherboard.
b.
Remove
the
wire clamp
screw
(item
4)
from
the side
panel.
c.
Remove
the
two
screws
(item
5)
holding
the
blue
transformer secondary
wires
to the
bottom
of the
motherboard.
5.
Mechanically disconnect
the
rear
panel
assembly
(item 6):
a.
Invert
the
instrument
and
remove
three
rear
panel
screws
(item
7).
b.
Remove
the
ASS
assembly
protective
cover.
c.
Remove
three
rear
panel
screws
(item
8).
d.
From
inside the
instrument,
push
the
rear
panel
out.
e.
Pull
the
rear
panel out
and
away
from
the fan
housing.
6.
Desolder
all
transformer primary
wires
from
the
line
module.
7.
Remove
the
four
1/4
inch
screws
(item
9a),
and
the
four
3/8 inch
screws
(item
9b),
from
the
side
panel.
8.
Remove
the last
two
screws
as
follows:
a.
Remove
the
cables
from
A25J1
and
A25J2.
b.
Remove
the
A24,
A25,
A26,
A27,
and
A28
assemblies.
c.
Using
an
offset
posidriv,
remove
the
two transformer screws on
the side
of
the
transformer
enclosure
closest
to
the
front
panel.
d.
Turn
the
instrument
on
its
side
and
remove
the
transformer,
carefully
pulling
one
end
out
a
short
distance,
and
then
the
other.
e.
Remove
the
metal plate
from
the
side of the
transformer
and
place
it
on
the
new
transformer.
1-18
Power Supplies/Fan
Repair
Procedures
HP
8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English