Canon iR8500 Service Manual page 62

2.3 Enlargement/Reduction Method
Change
Scanning speed in Direct
Difference in range
The machine is designed to use a higher scanning speed to keep up with the higher print-
ing speed. Under specific conditions, it involves digital processing to enlarge/reduce images,
thereby increasing scanning speed while allowing the scanner motor to operate at the range
of speed of the GP605.
When the ADF is used, the copying operations will normally be in stream reading mode;
at a 200% to 400% ratio, however, fixed mode will be used.
In book mode, all copying operations will be fixed mode.
Digital processing is used in combination under the following conditions:
• in fixed mode, between 25% and 49.9%
• in stream reading mode, between 25% and 84.9%
COPYRIGHT© 2001 CANON INC.
iR8500
450 mm/s
By optical means, between 25%
and 400%; in combination with
digital processing,
(between 25% and 49.9% in fixed
mode)
(between 25% and 84.9% in stream
reading mode; ADF use)
2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
CHAPTER 2 NEW FUNCTIONS
GP605
260 mm/s
Between 25% and 400% by optical
means (no digital processing)
2-7