Keithley 2182, Service Manual, Page: 68 / 120

Motherboard removal
Perform the following steps to remove the motherboard. This procedure assumes that the case
cover is already removed.
1. Remove the IEEE-488, RS-232 and BNC jack fasteners.
The IEEE-488 and the RS-232 connectors each have two nuts that secure the connectors
to the rear panel, while the BNC jack has a single nut. Remove these nuts.
2. Remove input jack.
Remove the four screws that secure the input jack PC board to the front panel. Remove
the ground wire from the chassis bolt, then remove the assembly.
3. Remove cables.
• Unplug the display board ribbon cable from connector J1003
• Unplug the transformer cables from connectors J1015 and J1016.
• Unplug the cable from J1014.
• Remove the cables from the cable clips at each side of the chassis, and remove the
cable ties.
4. Remove screw.
Remove the screw that secures the motherboard to the chassis. This screw also secures
U304.
5. Remove the motherboard, which is held in place by edge guides on each side, by sliding
it forward until the board edges clear the guides. Carefully pull the motherboard from
the chassis.
Front panel disassembly
Use the following procedures to disassemble the front panel:
1. Remove power pushrod.
Carefully pry the end of the power pushrod free of the power switch.
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 separates
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.
Disassembly 5-5