Konica Minolta bizhub C250 Service Manual page 102

Theory of operation ver. 3.0 Aug. 2006
B. Waste toner level check control
• The amount of toner is determined by the period of time the waste toner full sensor
(PC8) is being blocked while the moving vane of the transport screw rotates five times.
• The period of time the sensor is being blocked is divided into four levels. Level 3 is
judged as "waste toner near-full", and level 4 as "waste toner full."
• Once the toner-full is detected, it has to be replaced with the new waste toner box in
order to reset.
Waste toner full
sensor (PC8)
Light shield plate
A+B+C+D+E = the period of time the waste toner full sensor is being unblocked.
Level State
Level 1 No toner
Level 2 Toner low
Level 3 Waste toner near-full 30% to less than 34%
Level 4 Waste toner full
Display for the waste toner
near-full detection
• A different toner full warning screen is displayed if "user" is selected for "unit change"
available from the tech. rep. mode.
Rotation blades
4038T2C175AA
A B C
Period of time it rotates for 5 times
Unblocked time
/rotation time
40% to less than 55% -
34% to less than 40% -
20% to less than 30%
4038T2E205AA
15. Toner collecting section
1 rotation
ON
OFF
Period of time
the waste Toner is
being unblocked per rotation.
D E
4038T2C179AA
Operation
• Displays "waste toner near-full"
• Ready for printing
• Displays "waste toner full"
• Printing not available
• When detected during the job, printing will
stop when all paper exit.
Display for the waste
toner full detection
4038T2C180AA
4038T2E206AA
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