HP 54520 Series Service Manual page 103

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Chapter 6: Replacing Assemblies
To remove and replace the cover
To remove and replace the cover
Use the following steps to remove and replace the cover.
Disconnect the power cable.
Remove eight flathead screws that secure the trim strip.
e@ Four on the top
e@ One at each side
e Two on the bottom near the center
Remove the two screws that secure the handle.
Remove the screws and washers that secure the four rear feet.
Slide the instrument out through the front of the cover.
To reassemble the instrument, reverse the procedure.
To remove and replace the rear panel
Use the following steps to remove and replace the rear panel assembly.
Disconnect the power cable.
Remove the cover.
Detach the power switch extension shaft from
the power switch at the line filter.
The jaws of the extension shaft have ridges that fit
into notches on each side of the switch shaft. Both
ridges must clear the notches before the extension
shaft can be removed.
a Use amedium-size flat-blade screwdriver (about
1/4 inch or 6 mm) to carefully spread the jaws of
the switch extension shaft.
b While spreading the jaws, pull the extension shaft
toward the front of the instrument.
e When the extension clears the switch, remove the
extension from the front panel.
d To install the shaft, reverse the procedure.
You must spread the jaws of the extension shaft to
install it on the switch shaft.
Detach the line filter cable from the power supply.
Remove the six pan-head screws at the edges of the rear panel.
Pull the rear panel straight away from the instrument about three inches. Note the
banana connector at the bottom-right corner of the rear panel. During reassembly,
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be sure it inserts into the clip on the main assembly.
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