Disassembly Procedures; Case Cover Removal; Analog Board Removal - Keithley 2302 Instruction Manual

15-4 Disassembly

Disassembly procedures

Case cover removal

Follow the steps below to remove the case cover to gain access to internal parts.
WARNING
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NOTE
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Analog board removal

Perform the following steps to remove the analog board. This procedure assumes that the case
cover is already removed.
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Before removing the case cover, disconnect the line cord and any test leads from
the instrument.
Remove handle — The handle serves as an adjustable tilt-bail. Adjust its position by
gently pulling it away from the sides of the instrument case and swinging it up or down.
To remove the handle, swing the handle below the bottom surface of the case and back
until the orientation arrows on the handles line up with the orientation arrows on the
mounting ears. With the arrows lined up, pull the ends of the handle away from the case.
Remove mounting ears — Remove the screw that secures each mounting ear. Pull down
and out on each mounting ear.
When reinstalling the mounting ears, make sure to mount the right ear to the right
side of the chassis, and the left ear to the left side of the chassis. Each ear is marked
"RIGHT" or "LEFT" on its inside surface.
Remove rear bezel — To remove the rear bezel, loosen the two screws that secure the
rear bezel to the chassis, then pull the bezel away from the case.
Removing grounding screws — Remove the six grounding screws that secure the case
to the chassis. They are located on the bottom of the case at the back.
Remove chassis — To remove the case, grasp the front of the instrument, and carefully
slide the case off the chassis to the rear.
Unplug all cables connected to the analog board.
Remove the seven screws that secure the analog board to the chassis.
After all screws have been removed, carefully lift the analog board assembly free of the
main chassis.