Canon Color imageRUNNER C4580, Service Manual

Page: 253 / 851

Chapter 9
9-12
9.3.3 During Copying/Printing Operations (normal speed)
Full color, Plain paper, A4, 2 copies/prints, Y drum unit
Characteristics
- in response to a press on the Start key, the intermediate transfer belt (ITB) stars to rotate.
- the sequence of operations for drum units after exposure starts with a delay of 0.7 sec each
- the ITB continues to rotate after delivery of paper from the fixing unit (for post-imaging control)
F-9-8
When Making Y/M/C Monochrome Copies/Prints
If not for Bk (i.e., for Y, M, C), a high voltage is applied for the 4 colors as for full-color output when making
monochrome copies/prints. (Exposure is not executed for colors other than those in question.)
When Making Bk Monochrome Copies/Prints
When making Bk monochrome copies/prints, no high voltage is applied for Y or M, and the developing
motors for these colors are not driven.
PSTBY PSTBY PINTR PRINT LSTR
1 :
Drum/ITB
motor (M1)
Exposure (Y)
Charging (DC)
bias (Y)
Development
motor (Y)
Developing (DC)
bias (Y)
Developing (AC)
bias (Y)
Upstream auxiliary (DC)
bias (Y)
Upstream auxiliary (AC)
bias (Y)
Downstream auxiliary (DC)
bias (Y)
Primary transfer
bias (Y)
Secondary
transfer bias
Charging (AC)
bias (Y)
Cleaning by second-
ary transfer roller
Scraping off toner
by auxiliary brush
Scraping off toner
by auxiliary brush
Start key
ON
Approx. 8.5sec Approx. 2.4sec
Approx. 2sec
Y Drum Unit Sequence of Image Formation (plain paper)