Removal Of Individual Boards - Keithley 7001 Instruction Manual

3. Remove the screws concealed in the handle
mounting wells on each side of the instrument.
4. Lift the front end of the instrument slightly and re-
move the mounting ears by pulling each down-
ward approximately 1/8" (3mm).
5. Loosen the two mounting screws at the rear bezel
of the instrument. These screws are held captive in
the bezel, and cannot be removed completely.
When both screws are fully loosened, remove the
rear bezel.
6. Remove the instrument's grounding screw located
on the bottom side of the Model 7001.
7. Grasp the front bezel of instrument and carefully
slide the chassis forward, out of the metal case.
The internal board assemblies of the Model 7001 are
now accessible.

7.5.2 Removal of individual boards

Individual boards within the Model 7001 may now be
removed as needed. Removal of some boards requires
prior removal of other boards.
CAUTION
Some boards use mass termination
connectors which mate directly to ad-
jacent boards. Reinstallation of these
boards requires extra attention to
align pins and avoid mechanical
damage.
NOTE
Keep track of screws and other fasten-
ers which you may remove. Some
boards are held in place with a combi-
nation of long and short screws, or
other types of fasteners which must be
reinstalled in the proper positions. The
boards in the Model 7001 are intercon-
nected using a variety of cables and
terminations. As you disassemble the
instrument, make note of positions
and keying of terminations to assure
correct reattachment.
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Micro DIN board removal
Removal of the micro DIN board does not require re-
moval of any other boards. Refer to drawing 7001-053
Chassis Assembly at the end of this section.
To remove the micro DIN board:
1. Disconnect the cable which connects the micro
DIN board to the BNC board.
2. Remove the screw which holds the micro DIN
board to the chassis.
3. The micro DIN board is now held in position only
by a mass termination connector which mates to
the underside of the digital board. Carefully pull
the micro DIN board straight out of the chassis to
separate it from the digital board.
Assembly note: When you reinstall the micro DIN
board, take care not to bend any pins on this connector.
Power supply removal
Removal of the power supply board does not require
removal of any other boards. Refer to drawing 7001-
052 Digital Board/Chassis Assembly at the end of this
section.
The power supply board is located on the underside of
the instrument, immediately forward of the micro DIN
and BNC boards. It is covered by a ßexible insulating
shield which must be folded back to access the power
supply connectors and mounting screws. The power
switch is located on the BNC board, and actuated by a
rod which protrudes through the front panel as the
ON/OFF switch button.
WARNING
Disconnect the instrument from the
power line and all other equipment
before removing the power supply.
To remove the power supply:
1. Disconnect the power connectors from the forward
and rear ends of the power supply board.
2. Remove the pushrod:
Maintenance
7-5