HP 3457A - 6-27. Plug-In Support Assembly Removal; 6-29. AC Convertor (A3) Assembly Removal; 6-31. Analog (A2) Assembly Removal

3457A Replaceable Parts
f.
Remove
the
Digital
Assembly
by
raising
the
front
edge
of
the
board
and
sliding
it
forward.
&
g.
To
replace
the
Digital
(Al)
Assembly,
reverse
the
order
of
steps
a
through
f.
6-27.
Plug-In
Support
Assembly
Removal
6-28.
The
Rear
Terminal
Assembly
or
Plug-In
Assembly
and
Top
Cover
must
be
removed
prior
to
removing
the
Plug-In
Support
Assembly.
Remove
the
Support
Assembly
as
follows:
a.
Remove
the
Rear
Terminal
Assembly
(paragraph
6-17)
or
Plug-In
Assembly
(paragraph
6-19)
and
Top
Cover
(paragraph
6-21).
b.
With
the
front
panel
of
the
instrument
facing
you,
move
the
Plug-In
Support
Assembly
slightly
to
the
left
to
release
the
locking
tab,
and
lift
the
support
upward.
c.
Lay
the
Plug-In
Support
Assembly
over
the
front
panel
to
gain
access
to
the
Top
Analog
Shield.
(The
Support
Assembly
will
be
supported
by
its
cables.)
d.
Remove
the
Top
Analog
Shield.
(Press
the
sheet
metal
tabs
near
the
center
of
the
instrument
to
release
the
shield,
lift
the
shield
and
remove
it.)
e.
Disconnect
connector
A2-P501
and
the
five
input
wires
to
remove
the
Support
Assembly.
f.
To
replace
the
Plug-In
Support
Assembly,
reverse
the
order
of
steps
a
through
e.
6-29.
AC
Convertor
(A3)
Assembly
Removal
$e
6-30.
It
will
be
necessary
to
remove
the
Rear
Terminal
Assembly
or
Plug-In
Assembly,
Top
Cover,
and
Plug-In
Support
Assembly
prior
to
removing
the
AC
Convertor
Assembly.
a.
Remove
the
Rear
Terminal
Assembly
(paragraph
6-17)
or
Plug-In
Assembly
(paragraph
6-19),
Top
Cover
(paragraph
6-21)
and
Plug-In
Support
Assembly
(paragraph
6-27).
b.
Disconnect
the
red
and
black
input
wires
and
connector
A2-P303
from
the
Analog
(A2)
Assembly.
c.
Remove
the
screw
located
near
the
center
of
the
AC
Convertor
Assembly.
d, Remove the AC Convertor Assembly.
e.
To
replace
the
AC
Convertor
Assembly,
reverse
steps
a
through
d.
6-31. Analog (A2) Assembly Removal
6-32.
The
Rear
Terminal
Assembly
or
Plug-In
Assembly,
Top
Cover,
Plug-In
Support
Assembly,
and
AC
Convertor
(A3)
Assembly
must
be
removed
prior
to
removing
the
Analog
(A2)
Assembly.
Remove
the
Analog Assembly as follows:
a.
Remove
the
Rear
Terminal
Assembly
(paragraph
6-17)
or
Plug-In
Assembly
(paragraph
6-19),
Top
Cover
(paragraph
6-21),
Plug-In
Support
Assembly
(paragraph
6-27)
and
AC
Convertor
Assembly
(paragraph
6-29).
b.
Disconnect
the
five
input
wires
from
the
front
panel
and
connectors
Al
or
Al1-P502
and
A2-P901.