COPYRIGHT © 2001 CANON INC.
2000 2000 2000 2000
CANON SmartBase PC1200s/iR1200s REV. 0 DEC. 2001
4-11
CHAPTER 4 OPERATION
1.4 Power-On Sequence
The following is the flow of operation occurring from when the machine is turned on un-
til it enters standby state:
Standby
Power-On
Initializes the CPU,
Clears the RAM, Sets the Port
Starts communication
with the image processor PCB.
• Checks the reader unit (open/close).
• Checks paper (cassette, manual tray).
• Detects size of paper (LGL; cassette).
• Checks the thermistor (open/short).
Fixing Heater On
Fixing Heater OFF
Main Motor ON
The primary charging AC/DC bias,
Transfer Cleaning Bias ON
The developing AC/DC bias goes ON.
The primary charging DC bias and
developing AC/DC bias go OFF.
The main motor and
primary charging AC bias go OFF.
The transfer cleaning bias goes OFF.
Auto delivery occurs
if the paper leading edge sensor detects paper.
A jam is identified if the paper leading edge sensor
or the delivery sensor detects paper.
Checks the machine inside for residual paper.
NO
YES
0.2 sec after the fixing heater goes ON,
is the fixing temperature 100˚C ? Or, has 0.5 sec
passedafter the fixing heater went ON?
A check is made for the presence/absence of a cartridge
when the primary charging AC bias is applied.
The toner level is checked when the developing bias is applied.
F04-104-01
