Model 2500 Service Manual Disassembly 5-5
3. Unplug cables:
• Unplug the connecting cable at the rear of each input board.
• Disconnect the input board connecting cables from the mother board at J301
and J501.
4. Remove input board assembly.
Slide the input board assembly forward until the INPUT jacks clear the mounting
holes in the rear panel, then remove the assembly.
Mother board removal
Perform the following steps to remove the mother board. This procedure assumes that the
case cover and input boards are 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 hex head
screws that secure the connectors to the rear panel. Remove these screws.
2. Remove mother board mounting screws.
Remove the four mounting screws that secure the mother board to the chassis.
3. Unplug cables:
• Unplug the display board ribbon cable from J1014.
• Unplug the cable going to the power supply module from J104.
• Unplug the cables going to the power transformers from J305 and J505.
• Unplug the cable going to the OUTPUT indicator from J105.
• Unplug the wires going to the rear panel VOLTAGE SOURCE OUTPUT jacks
from J302 and J502.
4. Remove mother board.
Slide the mother board forward slightly until the rear panel connectors clear the
holes in the rear panel, then remove the board.
During reassembly, replace the mother board, and start the IEEE-488, DIGITAL
I/O, and RS-232 connector screws and the board mounting screws. Tighten all the
fasteners once they are all in place and the board is correctly aligned. Be sure to
plug in all cables.
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