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13-10
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.
C Turn the shutter only counterclockwise (looking from the
motor end) or you may damage the shutter switch on the other
end of the light.
•
Remove the chain from the sprocket with care to keep tension. The chain
has shortened links and will separate if slackened. If the chain opens,
attach an end to the sprocket with tape or wire and revolve the shutter.
•
Remove the motor sprocket by loosening the set screw.
•
Remove the two wire nuts from the motor coil wires.
•
Remove the four motor screws.
Installing the Motor
•
Mount the motor with four screws.
•
Install the sprocket in line with the shutter sprocket and tighten.
•
Install the chain on the sprockets.
•
Set the chain to where it has
motor screws lightly.
C Turn the shutter only counterclockwise (looking from the
motor end) or you may damage the shutter switch on the other
end of the light.
3
/
" Allen wrench.
32
3
/
" side travel and tighten the two accessible
8
94MS41 Rev C1 S/W Ver. 2.06
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