Servicing
Optical Bench Replacement
7-14 Model 48i Instruction Manual Thermo Electron Corporation
1. Disconnect the chopper motor power cable from the MOT DRV
connector on the measurement interface board.
2. Follow the directions for “Filter Wheel Replacement” procedure, up to
and including Step 3.
3. Remove the chopper motor from the motor plate by removing the two
screws that hold it to the motor plate.
4. Install the new chopper motor by following the previous steps in reverse.
5. Install the filter wheel on the motor shaft, make sure that the set screw
seats on the flat of the motor shaft, and tighten the set screw.
6. Calibrate the instrument. Refer to the “Calibration” chapter in this
manual.
Optical Bench
Replacement
Use the following procedure to replace the optical bench (Figure 7-7).
Equipment Required:
Optical bench
Philips screwdriver
1. Turn instrument OFF, unplug the power cord, and remove the cover.
2. Disconnect the chopper motor cable from the MOT DRV connector on
the measurement interface board, and disconnect the detector cable
from the PREAMP cable connector on the measurement interface
board.
3. Disconnect the plumbing connections from the optical bench.
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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