Servicing
Motherboard Replacement
7-34 Model 48i Instruction Manual Thermo Electron Corporation
4. Using the nut driver, remove the two standoffs securing the board to the
rear panel (Figure 7-16).
5. Pop off the digital output board from the mounting studs and remove
the board.
6. To install the digital output board, follow previous steps in reverse.
Motherboard
Replacement
Use the following procedure to replace the motherboard (Figure 7-15).
Equipment Required:
Motherboard
Philips screwdriver
Nut driver, 3/16-inch
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.
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.
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