Figure 7-7. Removing The Motor - Thermo Scientific 48i Instruction Manual

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2. Remove the chopper motor and wheel assembly by removing the three
motor plate Allen screws holding the motor plate to the optical bench
(Figure 7–7). Disconnect purge tube from wheel housing.
Motor Mount Screws (4)
Motor Plate Screws (3)
Figure 7–7. Removing the Motor
3. Remove the cross recessed screw on the bottom or the motor plate.
4. Insert the 5/64-inch Allen wrench through the access hole in the
bottom of the motor plate, loosen the set screw holding the filter wheel
to the motor shaft, and carefully pry the filter wheel off the motor shaft
(Figure 7–6).
5. Install new filter wheel by following the previous steps in reverse. Make
sure that the set screw seats on the flat of the motor shaft.
6. After the filter wheel is installed, spin the wheel and observe that it runs
true on the motor shaft.
7. Let the instrument sample zero air for about 90 minutes.
8. From the Main Menu, press
to scroll to Initial S/R Ratio > and press
The Initial S/R Ratio screen appears.
Note If Service Mode is not displayed, refer to
Mode" on page 7-3, then return to the beginning of this step.
Motor Motor Plate
to scroll to Service > press
"Accessing the Service
Model 48i Trace Level-Enhanced Instruction Manual
Servicing
Filter Wheel Replacement
>
.
▲
7-13