Operation; Scanner/Exposure Lamp Control - Develop ineo+ 6500 Service Manual

7. SCANNER SECTION
7.3

Operation

7.3.1

Scanner/Exposure lamp control

A. Home position search of the exposure unit
• When the sub power switch (SW2) is turned on, the exposure unit starts to search the home position after
the specified time passed.
[1] Home position
[2] Scanner home sensor (PS1)
B. Shading correction
• After searching the home position, the exposure unit performs shading correction.
• The white standard board attached to the rear side of the platen glass is used for the shading correction.
• There are two types of shading correction: white correction (two times) and black correction (one time).
• The white correction is performed by reading the white standard board (L1) with the exposure lamp turned on.
• The black correction is performed by reading the brightness with the L1 turned off.
• To acquire the white correction data, the brightness of each pixel is compared between the first time cor-
rection and the second time correction, and the brighter one is used as a white correction data.
• The shading correction reading operation differs between when the sub power switch (SW2) ON and when
the start button ON.
(1) The reading operation when the SW2 ON
[1] Home position
[2] Scanner home sensor (PS1)
[3] Platen APS position
[4] White correction (First time)
*1 Platen cover or DF is closed: The exposure unit stops at the home position.
*2 Platen cover or DF is opened: The exposure unit stops at the platen APS position.
24
[1] [2] [3]
[3]
[1]
*1
[7]
[5]
[6]
[7]
Theory of Operation Ver1.0 Sep.2006
Platen APS position
[2] [3]
[4]
[5]
[6]
*2
White correction (Second time)
Black correction
Returning the amount moved
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