Power-On Sequence - Canon iR1200 Series Service Manual

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:
Power-On
Initializes the CPU,
Clears the RAM, Sets the Port
• Checks the reader unit (open/close).
• Toner supply cover open/closed detection
• Toner bottle present/absent detection
• Checks paper (cassette, manual tray).
• Detects size of paper (LGL; cassette).
• Checks the thermistor (open/short).
Starts communication
with the image processor PCB.
Fixing Heater On
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?
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 transfer cleaning bias goes OFF.
The main motor and
primary charging AC bias go OFF.
Standby
COPYRIGHT © 2002 CANON INC.
Checks the machine inside for residual paper.
YES
F04-104-01
2000 2000 2000 2000 CANON iR1200/iR1300 Series REV. 0 AUG. 2002
A jam is identified if the paper leading edge sensor
or the delivery sensor detects paper.
NO
When the main motor goes ON, the machine always checks
the level of waste toner.
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.
Auto delivery occurs
if the paper leading edge sensor detects paper.
CHAPTER 4 OPERATION
4-11