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● Description of Motor driving circuit
Lamp Iris Motor and Lens Iris Motor
The lamp iris and the lens iris are equipped for the expansion of
visible contrast level. The operation of them is varied according to
"Image Level Selection" and their user menu.
Lamp Iris Motor
The lamp iris unit is located in the front of lamp. It is controlled by
the PWM signal, which is varied based upon the average luminance
level of the input image signal, from pin 40 of IC301. When the
image becomes darker, the lamp iris will be closed, and when the
image becomes brighter, it will be opened.
WINDOW EXTENSION
(OPEN)
Auto mode
(CLOSE)
APL of input signal
Door Motor
The projector provides 2 door switches. The door switch-1 (SW8801
on DOOR SW_1 board) turns ON, when the slide shutter is opened.
The door switch-2 (SW8811 on DOOR SW_2 board) turns ON, when
the slide shutter is closed.
If the slide shutter is half-open or close, the lamp does not light.
When turning the projector on, the lamp starts light after SW8801
turning on.
If the slide shutter error occurs during opertion, the POWER
indicator will blink orange and the projector will go to stand-by
mode after cooling.
WINDOW EXTENSION
Open mode
(OPEN)
Close mode
(CLOSE)
APL of input signal
-77-
● Lamp iris unit
LAMP IRIS UNIT
● Door motor
C L O
S E
MOTOR
DOOR SW_2 BOARD
DOOR SW_1 BOARD
Chassis Block Diagrams
MOTOR
WINDOW
(variable)
CLOSE
(at dark image)
CENTER
OPEN
(at bright image)
O P
E N
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