Konica Minolta magicolor 1690MF Service Manual page 66

Theory of Operation Ver. 1.0 Nov. 2008
(1) Toner cartridge rack standby position
• The M toner cartridge is provided with a slit for detecting the standby position.
• When the toner cartridge rack is rotated, the Rack positioning sensor (PS3) moves past
the slit for detecting the standby position. This allows the machine to determine that the
toner cartridge rack is currently at the standby position. Through pulse control of the rack
motor, the machine then successfully brings the toner cartridge rack to its exact standby
position.
Detection of M
developing
position
Detection of Y
developing
position
Detection of K
developing
position
Standby position
detecting position
Detection of C
developing
position
(2) Toner cartridge rack developing position
• To bring the toner cartridge rack to a stop at the corresponding developing position, the
rack is rotated from the standby position 62° through pulse control of the rack motor.
(3) Cartridge replacement position
• When a request is made for replacing the toner cartridge of a specific color of toner (by
means of an input from the control panel, upon a toner empty condition, or through an
input made via the printer driver), the toner cartridge rack is rotated 70° from the devel-
oping position through pulse control of the rack motor.
Y
K
Rack positioning sensorÅiPS5Åj
C
M
M
Standby position
12. Developing section
Direction of rotation of the
Toner cartridge rack
C
Photo conductor
K
Y
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