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1. The DC controller turns ON the developing engaging clutch (CL3).
2. When the CL3 stays engaged for specified time, the drive of delivery motor (M2) raises
the developing engaging lever up.
3. The developing engaging lever then raises the bottom of the cartridge in the back and
disengages the developing cylinder from the photosensitive drum.
The developing cylinder will engage back with the drum when the DC controller turns ON the
CL3 for a specified time to put the developing engaging lever back to its original position.
The developing cylinder disengages under the following conditions:
● Power is turned ON
● Print operation is complete
● During cartridge cleaning (described on the following page)
● During ITB cleaning
Developing cylinder engaging/disengaging detection
This monitors whether or not the developing cylinder is engaged with the photosensitive
drum. The DC controller monitors the developing engaging sensor (PS14) during the
developing cylinder engagement/disengagement operation. (See
Figure 5-39. Developing
engaging/disengaging unit.) The developing engaging lever has a projection on the top that
pushes the developing engaging flag up and shields the PS14 when the developing
engaging lever stays lifted up. When the developing cylinders are engaged, the PS14 is not
shielded by the flag, so it does not output DEVELOPING ENGAGING DETECTION signal
(DEVHPSNS) (Condition “L”). When the lever is lifted up, the PS14 is shielded by the flag
and outputs DEVELOPING ENGAGING DETECTION signal (DEVHPSNS) (Condition “H”).
The DC controller judges the “disengagement mechanism faulty” and sends the error
message to the formatter when the DEVHPSNS signal is not input/output within a specified
time during engagement/disengagement operation.
Cartridge cleaning control
This control is for the primary charging roller cleaning.
As the printer prints pages, toner gets attracted to the primary charging rollers. Accumulated
toner on the roller can cause some image defects, therefore it needs to be cleared away.
The DC controller sends a command for this control every specified number of pages.
ENWW Image formation system 163