Konica Minolta bizhub C658 Service Manual page 1821

bizhub C658/C558/C458/C368/C308/C258
[1]
[1] Toner cartridge positioning protrusion
(2) Toner hopper
• The toner replenishing port of the toner hopper of each color of toner is provided with a toner spillage prevention shutter that prevents
toner from spilling during removal or reinstallation of the developing unit.
• Mounting the developing unit pushes the shutter at the toner replenishing port, opening the toner replenishing port. Removing the
developing unit, on the other hand, closes the shutter and toner is thereby prevented from spilling from the toner replenishing port.
[1] Toner replenishing port
[3] Toner hopper toner spillage prevention shutter (closed:
developing unit removal position)
6.4.7 Toner supply PPM control
NOTE
▪ This control is available in bizhub C658/C558 models only.
▪ The print speed is high during a consecutive printing of high-coverage original, and so toner may not be provided fast enough.
▪ To prevent insufficient supply of toner (density reduction), this control temporarily lengthens the interval during a consecutive
printing at high coverage ratio to control the reduction of the toner density.
▪ This control will start when the coverage ratio exceeds approximately 80%, and 15 sheets has been printed consecutively.
▪ When the control starts, printing with an efficiency equivalent to bizhub C458 model is executed.
▪ Efficiency returns to normal after toner density is restored.
6.4.8 Front door mechanism
• The main power switch and total counter are mounted inside the front door.
(1) Front door locking mechanism
• The front door is provided with a locking mechanism.
(a) Unlocking the front door
• Pulling the front door to the front will release the door lock magnets (two) provided at the upper portion of the front door.
(b) Locking the front door
• Close the front door. When the front door is closed in its correct position, the door lock magnets (two) provided at the upper portion of
the front door lock the front door in place.
• The front door is provided with a protrusion that detects the correct mounting of the toner cartridge. It prevents operation of the
machine, when the toner replenishing shutter of the toner cartridge is closed.
(2) Front door open/close detection mechanism
• The front door switch detects that the front door is opened or closed.
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 6. TONER
[1]
[2]
[2]
[2] Toner cartridge toner replenishing port (toner cartridge
removal position)
[3]
[2] Toner hopper toner spillage prevention shutter (opened:
toner replenishing position)
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O-46
SUPPLY SECTION