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6.
Using a #2 Phillips screwdriver from the bottom of the instrument, remove the three
flat head screws holding the charging supply mounting bracket to the bottom plate.
Support the charging supply when removing the last screw. See Figure 9-4.
7.
Rotate the charging supply and mounting bracket until they rest on the side, allowing
access to the remote interface card(s) and bracket(s) underneath.
8.
On the back of the unit, identify whether the remote interface to be removed is
located in the Optional Interface 1 or Optional Interface 2 position.
9.
Using a 5/16" socket, remove the nut and lock washer holding the top of the bracket
to the rear panel.
10.
Using a #2 Phillips screwdriver from the underside of the unit, remove the two flat
head screws that hold the remote interface bracket to the bottom plate. See Figure 9-4.
11.
Remove the remote interface connector assembly from the Model 1140A.
8
Remote Interface Assembly Installation
1.
Position the remote interface bracket into one of the two locations at the back of the
unit, labeled Optional Interface 1 and Optional Interface 2 on the rear panel. Using a
#2 Phillips screwdriver from the underside of the unit, install the two flat head screws
that hold the bracket to the bottom plate. Tighten to 12 in-lb torque. See Figure 9-4.
2.
Using a 5/16" socket, install the nut and lock washer holding the top of the remote
interface bracket to the rear panel. Tighten to 12 in-lb torque.
3.
Position the remote interface ribbon cable against the rear panel.
4.
Position the charging supply and mounting bracket into the chassis and install the
three flat head screws from the bottom of the unit. Ensure that the remote interface
ribbon cable is not pinched under the mounting bracket. Tighten the screws to
12 in-lb torque with a #2 Phillips screwdriver. See Figure 9-3.
5.
Position the unit back upright.
6.
Route the ribbon cable for the remote interface under the power-supply assembly, as
shown in Figure 9-2.
7.
If installing a GPIB interface: Plug the GPIB interface board into the GPIB header on
the digital assembly. Using a #2 Phillips screwdriver, install the screw that holds the
board in place. See Figure 9-5.
8.
Plug the remote interface ribbon cable into the appropriate header on the digital
assembly or GPIB board. Ensure proper polarity, with Pin 1 (the edge of the cable
with a brown wire) as marked on the board. See Figure 9-5.
9.
Follow Procedure
9
Digital Assembly Removal
1.
Follow Procedure
2.
If a GPIB interface is installed: Use a #2 Phillips screwdriver to remove the screw
that holds the GPIB interface board to the digital assembly. Remove the GPIB
interface board. See Figure 9-5.
3.
Unplug the USB cable from the digital board.
2
for
Top Cover
Installation.
1
for
Top Cover
Removal.
9-7
Maintenance and Repair
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