Canon Image Reader-A1 iR5000i Service Manual page 255

[3] Last Rotation APC Control
Purpose: If intermittent printing is repeated in a short period of time, the absence of poten-
tial control will change the VL potential of the laser output. To make up for the change, an
appropriate correction value is obtained for the laser output control value, and the updated
value is used for the next job.
Timing: During last rotation for the first job 30 min after the laser output correction.
Potential measurement: The drum potential shows a discrepancy around the drum periphery
so that the average of potential levels is obtained. Based on the result, an appropriate correc-
tive value is obtained for the laser output.
COPIER>OPTION>BODY>LAPC-SW (switching laser APC correc-
tion)
0: ON (executes initial rotation APC if left alone for 10 min)
1: ON (default; executes initial rotation APC if left alone for 60 min.)
2: ON (executes initial rotation APC if left alone for 120 min.)
3: ON (turns off initial rotation APC only)
4: OFF
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-15 P