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Servicing
Chopper Motor Replacement
Chopper Motor
Replacement
7-14
Model 48i Trace Level-Enhanced Instruction Manual
9. At the Initial S/R Ratio screen, press
ratio to the value of the current ratio and press to store the value. The
initial S/R ratio should be between 1.14 and 1.18.
10. Calibrate the instrument. Refer to the "Calibration" chapter in this
manual.
Use the following procedure to replace the chopper motor
Equipment Required:
Chopper motor
Allen wrenches, 5/32-inch and 5/64-inch
Flatblade screwdriver
Phillips 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. Disconnect the chopper motor power cable from the MOT DRV
connector on the measurement interface board.
2. Follow the directions for
and including Step 4.
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.
to select set the initial S/R
▲
"Filter Wheel
Replacement" procedure, up to
(Figure
7–7).
Thermo Fisher Scientific
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