Vertical Bracket (Top-Cover Plate) Removal
To remove the Vertical Bracket from instruments that
do not have the DMM option installed, perform the follow-
ing
steps:
1.
Remove
the instrument Cabinet
as
described
in
that
procedure.
2. Set the instrument, bottom down,
on
a flat surface.
3.
Remove
two top securing screws at the front edge
of
the Vertical Bracket.
4.
Remove
the two screws
in
the right-center of the
Vertical Bracket.
5.
Remove the top securing screw at the left-rear of the
Vertical Bracket.
6.
Remove
the securing screw from the chassis rear
plate.
7.
Remove
the securing screw from the left side
of
the
chassis.
8.
Lift the Vertical Bracket up
and
away
from the
instrument.
To reinstall the Vertical Bracket, perform the reverse
of
the preceding instructions.
Be
certain to align the circuit
board at the right rear with the two black grommets
installed
in
the Vertical Bracket. Align the two black plastic
pins
on
the power supply assembly with their mating holes
before installing
and
tightening screws.
AS-Control
Board Removal
Removal
of
the Control Board is accomplished by the
following steps:
1. Remove the instrument wrap-around cabinet
as
described
in
that procedure.
Maintenance-2445A/2455A Service
2.
Place
the instrument
on
its left side
on
a flat surface.
3.
Disconnect the two ribbon-cable
and
one flex-circuit
connectors (P251, P651, and P652) from the Control board
(see
Figure
6-2).
4. Disconnect the two ribbon-cable connectors
(P511
and
P512)
from the Main Board.
5.
Remove
the five mounting screws securing the Con-
trol board to the chassis, one at
each
corner
of
the board
and
one
at the center.
6.
Lift the Control board away from the chassis.
To reinstall the Control board, perform the reverse
of
the preceding instructions.
FAN REMOVAL. To remove the
Fan
from instruments
that do not have the DMM option installed:
1.
Desolder the wires from the feed-through capacitor
(C10)
and
ground lug, noting color code for reassembly.
2.
Remove
the
Fan
retainer screw, located above the
Fan.
To reinstall the
Fan,
perform the reverse of the above
instructions. Align the holes
in
the
Fan
flange with the
pins on the rear plate before tightening the screw.
A2,
A3,
and A
12-Power
Supply Assembly
Removal
Removal
of
the Power Supply assembly from instru-
ments that do not contain options
is
accomplished by the
following steps:
1.
Remove
the instrument Cabinet
as
described
in
that
procedure.
2.
Remove
the Vertical Bracket as described
in
that
procedure.
6-25
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