Power-On Sequence - Canon LBP-1120 Service Manual

C. Power-ON Sequence
The following explains the sequence from power-ON until the printer enters the STANDBY mode.
1) Power-ON.
2) CPU initialization.
3) The video interface communication start.
After 0.5 seconds from the time the status command signal (/SC) turns "H", the video interface becomes ready to
communicate.
4) Paper jam detection and door open detection.
Detects the sensors for the presence of paper and door open.
5) Fixing unit ON
Drives the fixing unit for 0.5 seconds. Stops driving if the fixing unit temperature is 100°C or more.
6) Scanner motor initial rotation.
7) Main motor initial rotation.
8) High-voltage control.
Detects the presence of the cartridge after the primary high-voltage goes ON. Also, cleans the transfer charging
roller.
9) Failure/abnormality check
Detects the scanner and fixing unit failures.
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