Konica Minolta bizhub C658 Service Manual page 1989

bizhub C658/C558/C458/C368/C308/C258
Home position
[2]
[1] CIS module (CIS)
3.4.3 CIS control when the document is loaded
1. The cleaning brush is detected at its home position.
2. The LEDs of CIS are turned ON.
3. The cleaning brush is rotated one complete turn.
4. The LEDs are turned OFF.
5. The cleaning brush is rotated and brought to a stop at the home position.
NOTE
▪ No operation is performed when the document is loaded if the following function is selected using the service mode: [System 2] -
> [ADF Scan Glass Contamin. Set.] -> [Back Side] -> [ADF Scan Glass Contamin. Sensitivity] -> [Not Set].
3.4.4 CIS control when the start key is pressed
• This control is performed only in the 2-sided original reading mode.
(1) Before a print cycle / back side reading
1. The cleaning brush is detected at its home position.
2. The LEDs of CIS 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 correction during its second and third turn.
4. With the LEDs 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.
(2) 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 multiprint cycle in order to maintain an appropriate shading
correction value.
(a) 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 LEDs ON, the cleaning brush is brought to a stop at its home position (waiting for the original).
(b) 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 correction during its second and third turn. The shading
correction is performed (a total of twice).
2. With the LEDs 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.
[1] CIS module (CIS)
[3] Cleaning brush
Gain adjustment position
[1]
The gain adjustment position is near
the center of the shading correction surface.
Shading correction surface
[1]
[2]
[3]
The shading correction is performed
using the shading correction surface.
PC THEORY OF OPERATION DF-704 > 3. OPERATION
[2] Cleaning brush
[2] CIS glass
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PC-15