Specifications

The lens motor and the 4th/5th mirror motor move at a constant speed, but
the scanner motor speed varies according to the reproduction ratio. The CPU
changes the pulse rate (pulse per second) to adjust the speed for the
selected reproduction ratio.
HP sensors inform the main board when the first scanner, lens, and 4th/5th
mirror assembly reach their respective home positions. The main board
determines the stop position by counting the number of steps the motor
makes with reference to the home position.
1 December 1990
2-15