2400-902-01 (G - Feb 2006)
Model 2400 Service Manual 5-6
Disassembly
Digital board removal
Perform the following steps to remove the digital board. This procedure assumes that the ana-
log board assembly is already removed.
1. Remove the IEEE-488, Digital I/O, and RS-232 fasteners.
The IEEE-488, Digital I/O, and RS-232 connectors each have two nuts that secure the
connectors to the rear panel. Remove these nuts.
2. Remove the POWER switch rod.
At the switch, place the edge of a flat-blade screwdriver in the notch on the pushrod.
Gently twist the screwdriver while pulling the rod from the shaft.
3. Unplug cables:
• Unplug the display board ribbon cable.
• Unplug the cables going to the power supply.
• Unplug the rear panel power module cable.
4. Remove digital board.
Slide the digital board forward until it is free of the guide pins, then remove the board.
During reassembly, replace the board, and start the IEEE-488, Digital I/O, and RS-232
connector nuts and the mounting screw. Tighten all the fasteners once they are all in
place and the board is correctly aligned.
Front panel disassembly
Use the following steps to remove the display board and/or the pushbutton switch pad.
1. Unplug the display board ribbon cable.
2. Remove the front panel assembly.
This assembly has four retaining clips that snap onto the chassis over four pem nut
studs. Two retaining clips are located on each side of the front panel. Pull the retaining
clips outward and, at the same time, pull the front panel assembly forward until it sepa
-
rates from the chassis.
3. Using a thin-bladed screwdriver, pry the plastic PC board stop (located at the bottom of
the display board) until the bar separates from the casing. Pull the display board from
the front panel.
4. Remove the switch pad by pulling it from the front panel.
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