Digital Board Removal; Front Panel Disassembly; Removing Mechanical Components - Keithley 2302 Instruction Manual

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. Remove the IEEE-488 connector fasteners that attach the connector to the rear panel.
2. Disconnect all cables and wires connected to the digital board.
3. Remove the front panel by prying out the four retaining clips while pulling the front
panel away from the chassis.
4. Remove the three screws securing the digital board to the chassis (two outer screws of
the heat sink (not all four) and one screw securing the tab on U113).
5. 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.
During reassembly, 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. The procedure assumes that the front
panel has already been removed from the chassis as described above.
1. Remove the four screws that secure the display board to the front panel.
2. Remove the display board from the front panel.

Removing mechanical components

The following procedures to remove the fan and line filter require that the case cover, front
panel, and digital and analog circuit boards have been removed, as previously explained.
Fan removal
Perform the following steps to remove the fan:
1. Remove the four nuts that secure the fan to the rear panel.
2. Remove the fan from the chassis.
3. Pull out the fan connector from the digital board.
NOTE Digital board does not have to be removed to take out the fan.
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Disassembly 15-5