Konica Minolta bizhub C250 Service Manual page 28

Theory of operation ver. 3.0 Aug. 2006
bizhub C250/C252 main unit
General
1. System configuration............................................................................................... 1
2. Product specifications ............................................................................................. 4
2.1 Type ...................................................................................................................... 4
2.2 Functions .............................................................................................................. 5
2.3 Types of paper ...................................................................................................... 6
2.4 Maintenance ......................................................................................................... 6
2.5 Machine specifications.......................................................................................... 7
2.6 Operating environment ......................................................................................... 7
2.7 Print functions ....................................................................................................... 8
2.8 Scan functions ...................................................................................................... 8
3. Center cross section ............................................................................................... 9
4. Paper path............................................................................................................. 10
4.1 C250 paper path ................................................................................................. 10
4.2 C250 paper path ................................................................................................. 11
5. Image creation process ......................................................................................... 12
Composition/operation
6. Overall composition............................................................................................... 15
6.1 Timing chart at machine power up ..................................................................... 15
6.2 Control block diagram ......................................................................................... 16
7. Scanner section (IR section) ................................................................................. 17
7.1 Composition........................................................................................................ 17
7.1.1 CCD unit ..................................................................................................... 18
7.2 Drive ................................................................................................................... 18
7.3 Operation ............................................................................................................ 19
7.3.1 Scan and exposure lamp control................................................................. 19
7.3.2 Original size detection control ..................................................................... 21
8. Write section (PH section)..................................................................................... 24
8.1 Composition........................................................................................................ 24
8.2 Operation ............................................................................................................ 25
8.2.1 Outline......................................................................................................... 25
8.2.2 Laser exposure process.............................................................................. 26
8.2.3 Laser emission timing ................................................................................. 26
8.2.4 Laser shutter mechanism............................................................................ 27
CONTENTS
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