Detection Method Accompanying Deve. Control - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.7.8.5 Detection Method Accompanying DEVE. Control

TONER CARTRIDGE PRESENCE DETECTION
Whether or not the various color Toner Cartridges are mounted is detected at
the Toner Cartridge presence detection position by the CARTRIDGE
SENSOR. The CARTRIDGE SENSOR is a reflection-type photosensor that
determines the following by detecting light reflected from the Toner Cartridges.
Light is reflected The applicable Toner Cartridge is mounted.
Light is not reflected The applicable Toner Cartridge is not
mounted.
TONER CARTRIDGE NEW/OLD DETECTION
Whether the various color Toner Cartridges are new or old is detected at the
Toner Cartridge new/old detection position by the CARTRIDGE SENSOR.
With trickle development, used developer is collected in a separate
chamber in the Toner Cartridge. As the reflecting surface of a reflecting
seal applied inside the chamber is covered by the collected developer, it
gradually becomes unable to reflect. The CARTRIDGE SENSOR is a
photosensor that determines the following by detecting light reflected from
the collection chambers of the various Toner Cartridges.
Light is reflected Chamber contains no collected developer
(Toner Cartridge is new).
Light is not reflected Chamber contains collected developer
(Tone Cartridge is not new).
TONER CARTRIDGE "NO TONER" DETECTION
Lack of toner in the toner cartridge is detected by process control. The basic
flow for "no toner detection", "no toner reset", and "toner life warning" is
provided below and on the following pages.
Operating Principles
No toner detection flow
Figure 2-61. No Toner Detection Flow
Toner life warning reset flow
Figure 2-62. Toner Life Warming Reset Flow
Revision C
2-61