Canon 1000S, Service Manual

Page: 32 / 840

2. COPYING PROCESS
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-2
For each process color, the CLC1000 uses
one set of components; i.e., photosensitive drum,
developing assembly, cleaning unit. (In other
words, four sets are used for full color
reproduction.)
The CLC1000’s photosensitive drum consists
of a photo-conductive layer on the other side
(OPC) and a conductive aluminum substrate on
the inside.
The CLC1000 differs from black-and-white
copiers for the following:
Light is shined on a color original, and the
reflected light is separated by filters into the three
primary colors of light for conversion by a CCD.
Using analog video signals (RGB) from the
CCD, video signals are generated for each
process color (YMCK) to drive a semiconductor
laser.
A laser beam is directed to the appropriate
photosensitive drum to develop the image
representing the corresponding process color (of
toner; complementary to the corresponding filter)
for transfer to paper; the step is executed alike for
Y, M, C, and K.
The resulting image is fixed to the paper,
producing a color copy of the original.
The CLC1000 uses four photosensitive drums
for transfer of images to paper, and a transfer belt
is used to ensure that paper is moved horizontally
under each photosensitive drum for transfer.
The image formation block consists of the
following eight steps:
Step 1 Pre-exposure
Step 2 Primary charging
Step 3 Laser exposure
Step 4 Development
Step 5 Retention/transfer
Step 6 Separation
Step 7 Fixing
Step 8 Photosensitive drum cleaning
Auxiliary processes include pre-primary
charging, pre-fixing charging, and transfer belt
cleaning/static elimination.
Figure 2-102
4. Development
Registration
Manual feeding
Duplexing tray
Cassette 1
Cassette 2
Static Latent Image Formation Block
Y
M
C Bk
3. Laser exposure
2. Primary charging
1.
Pre-exposure
8. Drum cleaning
5. Retention/transfer
5. Transfer 6. Separation
7. Fixing
8.
1.
8.
1.
8.
1.
2. 2.
2.
Paper deck
Delivery