Cis Control When The Start Key Is Pressed - Konica Minolta DF-619 Service Manual

Theory of Operation Ver. 1.0 Jan. 2010
6.3.7

CIS control when the start key is pressed

• This control is performed only in the 2-sided original reading mode.
A. Before a print cycle / back side reading
1. The cleaning brush is detected at its home position.
2. The CIS exposure lamps are turned ON.
3. The cleaning brush is rotated three complete turns.
The cleaning brush cleans the CIS glass during its first turn.
The cleaning brush uses the shading correction surface to perform the shading cor-
rection during its second and third turn.
4. With the CIS exposure lamps ON, the cleaning brush is brought to a stop at its
home position (waiting for the original).
5. The back side of the original is read as the original moves over the CIS.
B. During a print cycle (operation between originals after reading)
The brush cleaning operation is normally performed each time the original is read.
If a print cycle produces a large number of printed pages continuously, however, either the
cleaning operation or the shading correction operation is performed.
The shading correction operation is performed at predetermined intervals during a multi-
print cycle in order to maintain an appropriate shading correction value.
(1) Cleaning operation
1. The cleaning brush is rotated one complete turn.
(The cleaning brush normally makes one turn, but makes three turns in the
despeckle mode.)
2. With the CIS exposure lamps ON, the cleaning brush is brought to a stop at its
home position (waiting for the original).
(2) Shading correction operation
1. The cleaning brush is rotated three complete turns.
The cleaning brush cleans the CIS glass during its first turn.
The cleaning brush uses the shading correction surface to perform the shading cor-
rection during its second and third turn. The shading correction is performed (a
total of twice).
2. With the CIS exposure lamps ON, the cleaning brush is brought to a stop at its
home position (waiting for the original).
Home position
The original is passed with the
cleaning brush at its home position.
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Shading correction surface
CIS module (CIS)
CIS glass
Cleaning brush
The shading correction is performed
using the shading correction surface.
6. OPERATION
A108T2C016DA
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