Konica Minolta bizhub C658 Service Manual page 1952

bizhub C658/C558/C458/C368/C308/C258
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).
[1]
[2]
[1] CIS module (CIS)
[3] Cleaning brush (Shading correction surface)
(c) After the print cycle
1. After the reading sequence, the LEDs are turned OFF.
2. The cleaning brush is turned backward (to tame the brush).
3. The cleaning brush is brought to a stop when its home position is detected.
4. The cleaning brush perform "ADF Scan Glass Contamin. Sensitivity".
• The LEDs are turned ON. The cleaning brush is rotated four 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).
• The cleaning brush uses the shading correction surface to perform "ADF Scan Glass Contamin. Sensitivity" during its fourth turn.
• The cleaning brush is brought to a stop at its home position.
• The LEDs are turned OFF.
NOTE
▪ Steps of 4 is not performed 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] .
5.3.8 CIS glass contamination prevention control
(1) CIS glass cleaning
• The CIS glass is cleaned only when two sides of the original are to be read.
• When the back side cleaning motor is energized, the cleaning brush is rotated to remove dust and dirt from the surface of the CIS glass.
• Cleaning of the DF original glass (front side) takes place at timing different from that of cleaning of the CIS glass (back side) and the
cleaning of the back side sources its power drive differently from the front side.
• The cleaning brush at its home position is detected by the back side cleaning home sensor.
PA THEORY OF OPERATION DUAL SCAN DOCUMENT FEEDER/SP-501/UK-501
[3]
[2] Cleaning brush (Home position)
- -
PA-14
(bizhub C658/C558/C458) > 5. READ SECTION