Konica Minolta bizhub C658 Service Manual page 1993

bizhub C658/C558/C458/C368/C308/C258
5. After the loop has been formed in the original, the registration motor is energized. The drive of the registration motor rotates the registration
roller, so that the original is transported onto the reading section.
6. The document reading motor is energized after the lapse of a predetermined period of time after the registration motor has been energized.
The drive of the document reading motor rotates document reading roller/1, document reading roller/2, document reading roller/3, and
document exit roller.
7. After the lapse of a predetermined period of time after the document reading sensor has detected the leading edge of the original, reading
of the front side of the original is started by the scanner.
8. The document reading roller/1 is retracted immediately before the trailing edge of the original moves past document reading roller/1. The
document reading roller/1 in the retracted position is pressed again as soon as the trailing edge of the original moves past the front side
reading position so as to be prepared for the next original.
9. When the leading edge of the original moves past the document reading roller/2, reading of the back side of the original is started by the
CIS. (Reading of the back side of the original is done only in the 2-sided mode.)
10. The document reading roller/3 is driven to transport the original onto the document exit section.
11. The document exit roller is driven to feed the original out.
12. The document reading motor is deenergized after the lapse of a predetermined period of time after the trailing edge of the original has
deactivated the document exit sensor.
3.7 DF open/close detection mechanism
3.7.1 Document exchange detection control
• An angle detection mechanism is provided to detect the operation of exchanging originals when the DF is used as the original cover of the
main body.
• When the DF is raised to an angle of about 14.5 degrees or more, the detection lever is pushed up by a spring. The angle sensor that has
been blocked by the detection lever is now unblocked. It is, as a result, detected that the DF "is raised to an angle of 14.5 degrees or
more".
• When, on the other hand, the DF is lowered to an angle of about 14.5 degrees or less, the detection lever is pushed down. Then, the angle
sensor, which has been unblocked, is blocked, so that it is detected that the DF "is lowered to an angle of 14.5 degrees or less".
• When the DF state undergoes changes from a condition of being fully lowered to a condition of "being raised to an angle of 14.5 degrees or
more" and then to a condition of "being lowered to an angle of 14.5 degrees or less", it is determined that "an original is placed manually on
the original glass". Then the original size detection control will be started.
3.7.2 DF open/close detection
• The magnet is installed to detect the open/close status of the DF on the main body side.
• The original cover sensor on the main body will turn ON by the magnet when lowering the DF.
[1] Angle sensor (PS202)
[3] Magnet
3.8 Cooling inside the unit mechanism
• The DF cooling fan motor functions to cool the inside of DF, DF control board, and document feed motor in the DF.
• It discharges heat generated inside the DF out through the exhaust port.
[1] DF cooling fan motor (FM1)
3.9 DF skew adjustment mechanism
3.9.1 DF Skew(Front) adjustment mechanism
• The document feeder is installed to the scanner section of the machine and fixed with two hinges.
[3]
[1]
[2]
[1]
[2]
PC-19
PC THEORY OF OPERATION DF-704 > 3. OPERATION
[2] Original cover sensor (RS201)
- -
[2] DF control board (DFCB)