6-36 | Model 931S / Model 932S UV Analyzers
c. Remove the Snap Ring and Spring Washer from the Chopper
Shaft.
Remove the Bushings (2), Bearings (2), and Chopper Wheel from
the Chopper Shaft.
d. Replace one Bushing on the Chopper Shaft, followed by a new
Bearing (P/N 300-9437), the Chopper Wheel, another new Bearing
and the other Bushing.
Replace the Spring Washer and the Snap Ring on the Chopper
Shaft.
e. Replace the new Drive Belt (o-ring, P/N 300-1528) by first placing
it in the Chopper Wheel groove and then rolling it over the Pulley
and into the groove. Use care to avoid stretching the Drive Belt.
Rotate the Chopper Wheel to ensure the Belt is properly seated
in the Chopper Wheel and Pulley grooves, and to make sure the
Bearings and other parts are properly aligned.
f. Align the two halves of the Chopper Assembly and secure them
using (4) M3 x 8 screws.
8. Replace the Optical Bench in the Upper Enclosure:
Ensure there is no power being supplied to the analyzer while install-
ing the Optical Bench.
While installing the Optical Bench in the Upper Enclosure, take care
not to damage the enclosure’s joining areas (flamepath).
a. With the Lower/Upper Cam Pins in the “LOOSE” position, care-
fully replace the Optical Bench in the Upper Enclosure and in-
stall the assembly’s Optical Bench Mount over the Cell Window
Housing mount.
While holding the Optical Bench by its upper portion with one
hand, rotate the Lower Cam Pin counter-clockwise and the Upper
Cam Pin clockwise until they are tight (“CLAMPED” position).
The Cam Pins must stay aligned while the Optical Bench is being
installed in the enclosure. The lined groove on the head of each Cam
Pin must be parallel to the Measuring Cell until the Optical Bench is
in place.
!
WARNING
!
CAUTION
NOTE
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