Thermo Scientific 42i Instruction Manual page 224

Servicing
Measurement Interface Board Replacement
Measurement
Interface Board
Replacement
7-40 Model 42i 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
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 eight 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 7–20).
Equipment Required:
Measurement interface board
Philips screwdriver
Equipment Damage Some internal components can be damaged by small
amounts of static electricity. A properly ground 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
on page 7-8 in this chapter.
2. Unplug all connectors. Note the locations of the connectors to facilitate
reconnection.
"Digital Output Board
▲
Thermo Fisher Scientific
Panel"