Disassembly 5-5
4. Remove screws.
• Remove two fastening screws that secure the analog board assembly to the
chassis. These screws are located on the side of the board opposite from the heat
sink.
• Remove two screws that secure the heat sink to the chassis.
5. Remove analog board assembly.
After all screws have been removed, carefully lift the analog board assembly free of the
main chassis.
6. Disassemble analog board assembly.
• Remove the screws that secure the analog board and heat sink to the analog board
subchassis.
• Carefully remove the heat sink by sliding the clips off the power transistors.
CAUTION Be careful not to damage the heat sink insulation layer.
• Remove the analog board from the subchassis.
• Remove four screws that secure the bottom cover, then remove the cover
from the bottom of the PC board.
NOTE When re-installing the heat sink, make sure that all clips are properly installed
and centered on each pair of output transistors.
Digital board removal
Perform the following steps to remove the digital board. This procedure assumes that the an-
alog board assembly is already removed.
NOTE In order to remove the digital board, the display board must first be removed.
1. Remove 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 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.
• The fan may need to be removed.
4. Remove digital board.
Slide the digital board forward until it is free of the guide pins, then remove the board.
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