Minolta CF910 Service Manual page 74

<Toner Replenishing Control by ATDC Detection>
• An ATDC detection is made while each of the Developer Supply Clutches (C, M, and Y)
CL17, 18, and 19 is energized (during a copy cycle).
• The number of detections made varies depending on the paper size in the feeding direc-
tion as detailed below.
Feeding-Direction Paper Size
To 275.0 mm (or at 2-sheet attraction)
275.1 mm to 412.5 mm
412.6 mm to 550.0 mm
• Time for toner replenishing from the Hopper is determined by comparing the actual read-
ing of toner-to-carrier ratio with the ratio set for "ATDC Level Setting" of the Service
Mode.
• The time for one toner replenishing sequence is limited in the range between 700 msec.
and 1150 msec. to prevent the Toner Supply Port from being plugged with toner.
Example
Making multiple copies on paper of a feeding-direction size to 275.0 mm with 6% set for
"ATDC Level Setting" of the Service Mode
ATDC Detection (%)
Toner Replenishing
Time (msec.)
A. Since the toner replenishing time is less than 700 msec., the copier does not perform
any toner replenishing sequence, but stores the time in memory.
B. A (616 msec.) + 616 msec. = 1232 msec. Since the max. allowable toner replenishing
time is 1150 msec., however, 1232 msec. - 1150 msec. = 82 msec. is stored in memory
and added to the next toner replenishing time.
Paper
4.1 3.9
988 1114
M-57
No. of Detections
4.8 4.8
616 616
2 (4)
3
4
A B
1144M14TCA
1144M14TCA