Canon 1000S, Service Manual

Page: 72 / 840

3. OPERATION AND TIMING
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-28
2. Sequence of Operations
Thick Paper Mode, A4/LTR, 2 Copies, 4-Color, Direct, Cassette 1
Figure 3-127
Start key ON
STBY STBY DSRDY CNTR COPY
LSTR
Potential correction
Pre-scan
Photosensitive drum motor
Transfer belt motor
Pick-up motor
Registration roller clutch
Grid bias
Primary charging bias
Scanning lamp
Original scanner motor
Period
DSRDY (scanner ready)
CNTR (control rotation)
COPY (copy)
LSTR (last rotation)
From when the Start key
is pressed until pre-
scanning ends.
From the end of DSRDY
until paper is drawn for
retention.
From when paper starts to
wrap around the transfer
belt until all toner has
been transferred to the
paper.
From the end of COPY
until the main motor stops.
Purpose
Executes scanning for an
original and shading
correction.
Measures and controls the
drum surface potential. Picks
up paper.
Turns ON/OFF the laser
according to video signals,
and develops and transfers
specific colors.
Discharges paper. Stabilizes
the photosensitive drum
sensitivity. Removes charges
from the transfer belt, and
cleans the drum.
Remarks
Table 3-102
• The machine’s scanner becomes ready for operation when the temperature of the fixing roller reaches a
specific value so that the image of the original may be read in response to a press on the Start key. Writing
of the image on the surface of the photosensitive drum becomes ready when the image signals have been
stored in memory. (Image formation starts in relation to a registration signal.)
Control in relation to signals other than the registration signal is discussed using separate timing charts.