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Servicing
Measurement Interface Board Replacement
Measurement
Interface Board
Replacement
7-44
Model 42i Trace Level Instruction Manual
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Remove the I/O expansion board (optional), if used. See the "I/O
Expansion Board Replacement" procedure in this chapter.
3. Remove the digital output board. See the "Digital Output Board
Replacement" procedure in this chapter.
4. Unplug all connectors from the motherboard. Note connector locations
to facilitate reconnection.
5. Using the nut driver, remove the six standoffs securing the board to the
rear panel.
6. Pop off the motherboard from motherboard support bracket, and
remove the motherboard.
7. To install the motherboard, follow previous steps in reverse.
8. Calibrate the analog voltage outputs as defined earlier in this chapter
(all ranges).
Use the following procedure to replace the measurement interface board
(Figure
7–21).
Equipment Required:
Measurement interface board
Philips screwdriver
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly grounded antistatic wrist strap
must be worn while handling any internal component.
1. Lower the partition panel, then proceed to the next step below. Refer to
"Removing the Measurement Bench and Lowering the Partition Panel"
on page 7-8 in this chapter.
2. Unplug all connectors. Note the locations of the connectors to facilitate
reconnection.
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Thermo Fisher Scientific
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