Keithley 2701, Service Manual

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5-6 Disassembly Model 2701 Service Manual
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.
Removing power components
The following procedures to remove the power transformer, power module, and fan require
that the case cover and motherboard be removed, as previously explained.
Power transformer removal
Perform the following steps to remove the power transformer:
1. Remove the motherboard.
2. Remove the two nuts that secure the transformer to the side of the chassis.
3. Pull the black ground wire off the threaded stud and remove the power transformer
from the chassis.
Power module removal
Perform the following steps to remove the power module:
1. Remove the motherboard.
2. Remove the POWER switch rod.
3. Remove the card cage. ( See “Card cage removal” on page 5-5 .)
4. Disconnect the power module’s ground wire. This green and yellow wire connects to a
threaded stud on the chassis with a kep nut.
5. Squeeze the latches on either side of the power module while pushing the module from
the access hole.
Fan removal
Perform the following steps to remove the fan:
1. Remove the motherboard.
2. Remove the four screws that secure the fan to the bottom of the chassis.
3. Remove the fan from the chassis.