User`s manual

A-Chain Alignment Procedures
Notes
4-5
a. Preliminary Procedures
Remove the existing exciter lamp and replace with a new lamp.
Adjust the exciter lamp DC voltage to 70% to 85% of the rated voltage and verify
that there is no more than 3% ripple present with the lamp on, using an AC
millivolt meter or oscilloscope.
LAMP VOLTAGE DC ADJUSTMENT
6 V 4-5 volts
9 V 6.5-8 volts
If the projector uses a plastic light pipe or tube, verify that the light output is not
appreciably affected by dirt, cracks or flaws, yellowing, or foreign matter.
Replace if necessary.
Place a white card at the front of the lens, close to the position of the film
soundtrack. Then adjust the position of the exciter lamp until the image of the
filament is centered both vertically and horizontally as shown.
You may find that obtaining an image of the filament is difficult in some
projectors. Place a piece of tissue paper over the lens to assist in seeing the image
of the filament. Some projectors do not use adjusting screws to change the
position of the lamp; shims are sometimes used for positioning.