Repair manual

PARTS REPLACEMENT
4-10
C. REPLACING THE FILTER WHEEL ASSEMBLY
1. REMOVAL: (Figure 4-4)
a. Disconnect AC power from the system.
b. Remove the six screws and washers holding the Cover to the bottom
of the chassis (Figure 4-2). Slide the Cover to the rear and lift it off.
c. Remove the four screws holding the Front Housing Assembly to the
chassis (Figure 4-2). Remove the Front Housing.
d. Remove the Filter Wheel Retaining Ring from the pivot shaft.
e. Lift the Stepper Motor Drive Wheel from the outside rim of the Filter
Wheel Assembly.
f. Slide the Filter Wheel Assembly off the pivot shaft
2. INSTALLATION:
a. Perform steps a.--f. above in reverse order
Note: Be sure the Stepper Motor Drive Wheel rests on
the outside of the Filter Wheel Assembly rim.
Important: When replacing the Filter Wheel, use care
to keep dirt and fingerprints off the filters.