Scanning Magnification - Ricoh B064 Service Manual

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6.3.4 SCANNING MAGNIFICATION

Reduction and enlargement is done differently for main scan and sub scan:

• Main scan: Handled by image processing in the IPU.

• Sub scan: Handled by varying the speed of the scanner motor.

Reproduction ratios of 50% or higher: The scanner speed is lower for higher

magnification ratios. For example, for 200% enlargement, the scanner motor speed

is reduced to 50%.

Reproduction ratios of less than 50%: The scanner motor cannot run fast

enough. So, the scanner slows to half the speed required for that reduction ratio.

For a 49% magnification ratio, the scanner speed is the same as for 98%

magnification. This causes twice as many scan lines as needed, so alternate lines

are removed.

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