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13-10
Shutter Switch
The switch provides shutter position information to the PC board. This
switch is in the lamp end where the cable enters, inside the manifold
cover. The cam is in the chamber with the shutter. A failure of the switch
can cause the shutter to rotate continuously or erratically. Similar
problems may be due to the shutter motor brake, the idle setting, or the
PC board.
The switch contacts close when the shutter is fully open and remain closed
until the shutter closes. This level can be measured on the terminal strip
from terminal 9 (+) to terminal 7 (-). The level is 12 VDC when the
shutter is closed, and 0 V when the shutter opens. The switch is in the
lamp head on the end where the cable enters inside the air manifold on
older units. On newer units we use the normally open contacts, COM
contact and the center contact. We use the normally closed contacts, the
two outside leads, not the center contact. This switch is adjustable on
older units. We recommend scribing a line around the switch and the
bracket, if replacement is necessary, to return to the same position. The
switch roller should be centered on the cam and closed when the cam
pushes the wheel on the switch halfway.
Shutter Brake
The motor that drives the shutter has a brake that is magnetically operated.
When the motor core magnetizes, it pulls a lever to release the brake. If
the shutter coasts or rotates continuously, look at the shutter LED on the
PC board. On early boards, where there are three LEDs in a row near the
front of the power supply, it is the third from the front of the power
supply. On the newer models, there are five in a row; it is the fourth from
the front of the power supply. When this light goes out, the shutter brake
should engage. If the shutter coasts, the brake may have failed. The shutter
may coast to the point where the switch will switch again to cause the
motor to energize. The LED on the board will flash if this occurs.
Shutter Motor
The shutter motor is located in the lamp head on the side with the shutter
drive chain. We recommend checking the power and signals from the
switch and to the motor coil, before entering the lamp head. These items
are covered in the preceding sections. Changing the shutter motor requires
a Phi l l i ps screw dr i ver and a
•
Remove the glass and outer reflector from the light head.
•
Open the end of the light head, where the drive chain and the sprocket
are located.
•
There are four screws that hold the motor; two of them require access
through holes in the sprocket. The shutter can be turned counterclockwise
to access these screws, by pushing the brake on the motor.
3
/
" Allen wrench.
32
94MS42 Rev. B1 S/W Ver 2.06
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