Analog Board Removal; Digital Board Removal; Front Panel Disassembly - Keithley 2303 Service Manual

3-4 Disassembly
2.
NOTE
3.
4.
5.

Analog board removal

Perform the following steps to remove the analog board. This procedure assumes that the case
cover is already removed.
1.
2.
3.

Digital board removal

Perform the following steps to remove the digital board. This procedure assumes that the
analog board assembly has already been removed.
1.
2.
3.
4.
5.
During re-assembly, replace the board, and start the IEEE-488 connector nuts. Tighten all the
fasteners once they are all in place and the board is correctly aligned.

Front panel disassembly

Follow the steps below to disassemble the front panel (Models 2303 and 2303-PJ only). The
procedure assumes that the front panel has already been removed from the chassis as described
above.
1.
Remove Mounting Ears — Remove the screw that secures each mounting ear. Pull down
and out on each mounting ear.
When re-installing 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 two 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 six 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.
Remove the IEEE-488 connector fasteners that attach the connector to the rear panel.
To remove the POWER switch rod, place the edge of a flat-blade screw driver in the
notch on the pushrod, then gently twist the screw driver while pulling the rod from the
shaft.
Disconnect all cables and wires connected to the digital board.
Remove the front panel by prying out the four retaining clips while pulling the front
panel away from the chassis.
Remove the digital board by sliding it forward until it is free of the guide pins, then slide
the board forward toward the front of the chassis until it can be pulled free.
Remove the four screws that secure the display board to the front panel.