Operation; Image Creation Control - Konica Minolta bizhub 500 Service Manual

Theory of Operation Ver1.0 Feb.2006
8.3

Operation

8.3.1

Image creation control

When the print start signal turns ON [1], various motors turn ON to place each unit in the operating condition. At
the same time, the erase lamp (EL) turns ON to neutralize the drum and the charging corona charges the drum.
A specified period of time after the print start signal turns ON, the developing bias turns ON [2] and then a high
voltage is impressed [3] on the guide plate. When the preparation for image creation is made, an image is cre-
ated on the drum surface by laser irradiation and developing.
A specified period of time after the registration clutch (CL1) turns ON [4], a high voltage is impressed on the
transfer corona [5] and the separation corona [6] to turn ON the transfer exposure lamp (TSL) [8] and the drum
claw solenoid (SD2) [9] sequentially. The ON timing [7] of TSL varies according to the type of paper. And the ON
time period of TSL also varies according to the setting environment. An image created on the drum is transferred
onto paper and then the paper is separated from the drum.
A specified period of time after the registration sensor (PS1) detects the trailing edge of paper and turns OFF
[10], each operation turns OFF. However, some operations turn OFF a specified period of time after PS1 detects
the trailing edge of the last paper and turns OFF [11], or a specified period of time after the fusing exit sensor
(PS3) detects the trailing edge of the last paper and turns OFF [13]. For the charging corona, the developing bias
and the guide plate bias, with the OFF timing [12] by the last paper of the transfer corona used as a starting
point, each of the OFF timing is interlocked.
Drum motor (M1)
Developing motor (M3)
Registration sensor (PS1)
Registration clutch (CL1)
Erase lamp (EL)
Charging corona (HV)
Developing bias (HV)
Transfer corona (HV)
Separation corona (HV)
Guide plate bias (HV)
Transfer exposure lamp (TSL)
Drum claw solenoid (SD2)
Fusing exit sensor (PS3)
[1] Print start signal ON
[2] Developing bias high voltage impressed
[3] Guide plate bias high voltage impressed
[4] Registration clutch (CL1) ON
[5] Transfer corona high voltage impressed
[6] Separation corona high voltage impressed
[7] Varies according to the type of paper.
[1] [2] [3] [4] [5] [6] [10]
[7] [8] [9]
[8]
[9]
[10]
[11]
[12]
[13]
8. PHOTO CONDUCTOR SECTION
[11]
[12]
Transfer exposure lamp (TSL) ON (This var-
ies according to the setting environment.)
Drum claw solenoid (SD2) ON
Trailing edge of the 1st paper detected
Trailing edge of the last paper detected
Transfer of the last paper OFF
Trailing edge of the last paper detected
[13]
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