6 : M e c h a n i c a l a n d E l e c t r o n i c A d j u s t m e n t s
CHRISTIE
CHRISTIE
35/70 Service/PM Manual
March, 1997
Focus Blower
The focus blower control valve controls the amount of air flow onto the film. This valve is adjusted so that the film frame
in the aperture opening remains stable, thus reducing the effect of film breathing.
Film Format Conversion
The 35/70 projector is capable of being converted from a 35mm projector to a 70mm projector in a matter of 15 minutes.
The conversion process for converting from 70mm to 35mm is as follows. (Refer to Figure 4.2 for part locations.)
1.
Insure power is turned off to the projector.
2.
Remove all 70mm reels and install 1 reel spacer on both the upper and lower reel shafts.
3.
Remove the upper and lower C.V. sprocket pad shoes.
4.
Loosen both the upper and lower C.V. sprocket film stripper posts.
5.
Remove the upper and lower C.V. sprocket knobs and sprockets.
6.
Install a C.V. shaft spacer, 35mm C.V. sprocket, and 35mm C.V. sprocket knob on both the upper and lower C.V.
sprocket shafts. Insure that the allen set screws used to hold the sprockets and knobs are tightened against the flats on
the shafts.
7.
Install the 35mm C.V. sprocket pad shoes on the upper and lower C.V. sprockets. Insure that the gap between the
Delron pad and the sprocket is approximately equal to the thickness of two pieces of film.
8.
Rotate the upper and lower film stripper posts so that the stripping bar is pointed towards the sprocket and the post is
not touching the sprocket teeth, Secure the post.
9.
Remove the movable gate using the two thumb screws.
10.
Disconnect the EOF/BOF sensor cable and remove the fixed gate.
11.
Install the 35mm fixed gate threading the EOF/BOF sensor cable above the pull-down sprocket. Reconnect the cable
and insure that the cable is not coming in contact with the sprocket.
12.
Install the movable 35mm gate.
13.
Remove the 70mm steel upper buckle plate and install the 35mm buckle plate. Secure the plate such that it does not
interfere with the opening and closing of the gate.
14.
Minor adjustments may need to be made to the gate assembly to minimize film pinching. (Refer to Section 6.8.)
15.
To convert the projector from 35mm to 70mm, follow the above steps removing all spacers and using 70mm parts.
Sound Heads
The adjustments of sound heads is not covered as a part of this manual. Refer to head manufacturer for alignment
procedures.
