Changing Shutter Blades - Eiki ESL SERIES Service Manual

3. Claw Lever Tension
(See Fig. #25)
The claw lever tension force should be from 1.2 to 1.25kg when the spring is stretched to
the maximum travel of the claw lever arm. If the tension is too weak, the cam follower
may float off the cam surface causing excessive gate noise and an unsteady picture. On the
other hand, if the spring is too strong the cam follower may wear out prematurely or cause
a slight hesitation to the claw lever when the projector is initially started. To obtain the
correct tension it may be necessary to replace the spring. A slight adjustment can be made
by stretching the spring if necessary.
F. CHANGING SHUTTER BLADES
Fig. #27
Two, three and five bladed shutters can be mounted on the shutter hub. The mounting holes
used to secure the blades to the hub allow a small adjustment for shutter blade timings.
Incorrect shutter timing results in what is commonly called "travel ghost". The adjustment is
accomplished using the SMPTE test film and adjusting the blade position for minimum upper
or lower image movement as shown in Fig. #27. Since the adjusting screws are only accessible
with the cam tank removed, this becomes a trial and error adjustment. However, the skilled
technicians can accomplish this in one or two adjustments.
When mounting a 2 blade shutter to the center hub, the recessed circle of the blades must be
toward the side where the 3 mounting screws are located.
The relationship of the shutter blade to the indexing semicircle on the hub must be as
illustrated in Fig. #28. 3 blade shutters will always index correctly.
Fig. #28
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