HP 8340b User Manual

Front
Panel
Repair
Procedures
FRONT PANEL DISASSEMBLY
Figure
G-4
illustrates
the
following
procedure.
1.
Disconnect
the
AC
power
line
cord.
2.
Remove
the
instrument top
cover.
3.
Remove
the
vinyl
trim
from
the
top,
front
edge
of
the
instrument
(pry
a
corner
loose and
gently
peel
the
trim
from
the
bezel).
4.
Remove
all
five
screws
under
the
trim.
NOTE:
The
length
of
these
five
screws
is
important (see
REPLACEABLE
PARTS).
Longer
screws
protrude
through
the
display
casting and
can
damage
the
display
driver
assembly.
5.
Remove
either
front foot (instructions
are on
the
foot)
to
release
the
information cards
tray,
and
remove
the
tray.
6.
Remove
three
of
the
five
screws
on
the
lower,
front
frame
edge
(see
Figure
G-4),
and
loosen
a
fourth,
if
necessary.
NOTE:
The
loosened
screw centers
the
RF
connector
in
the front
panel
opening.
Be
sure
the
con¬
nector
is
recentered and secured
during
front panel
reassembly.
7.
Gently
pry
the
front panel
and
display
assembly
from
the
frame.
You
may
have to
apply
pressure
from behind,
against
the display
assembly.
8.
If
you
intend to
remove
the
entire
front
panel,
you
must
disconnect
the
five
coaxial
cables
that
connect
the
front
panel
BNC
connectors
to
the
motherboard
8MB
connectors,
and
the
two
50-
wire
ribbon
cables.
If
you
intend
to
only
troubleshoot the
display
and/or keyboard
assemblies, you
must
disconnect
only
the
ribbon
cable
attached
to
the
display
assembly.
9.
Separate
the
keyboard
assembly
from
the
display
assembly
by
removing
the
three
screws
between
the
panel
castings.
10. To
troubleshoot the
keyboard, reconnect
the
ribbon
cables and attach
the
display
to
the
top
of the
front
casting
for
support.
11.
To troubleshoot
the
display,
configure
the
display assemblies
in
the
service
position
(Figure
G-6),
reconnect
the
ribbon
cables,
lay
the
display
assembly on
the
reinstalled
top
cover,
and
attach
the
keyboard
to
the
front
panel
for
support.
G-16 Front Panel Repair Procedures
HP
8340B/41B

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English