Power On Sequence - Canon LBP-1760 Service Manual

C. Power ON Sequence
The sequence from power ON until the engine controller enters the STBY mode is shown below.
1) Power ON
2) CPU initialization
3) Fan motor drive
4) Pick-up unit configuration detection
5) Video interface communication start
Outputs /PPRDY signal. When /CPRDY signal becomes "L," the engine controller stands by
for the video interface communication.
6) Initial drive of main motor
Detects the paper detection condition of each sensor in the printer when the main motor
starts, and assesses a paper jam if residual paper is detected.
7) High-voltage control
Checks whether there is cartridge or not and the toner level, and cleans the transfer charg-
ing roller after the developing AC bias is turned ON.
8) Failure/abnormality check
In this period, the printer checks for door open, emergency stop command (EC18) reception
condition, fan motor failure, main motor failure, and fixing unit failure as required.
9) Residual paper check in the printer.
Turns ON the feed roller clutch and starts the detection of the residual paper in the printer
again when the main motor becomes ready. When residual paper is detected, the engine
controller detects the jam, waits for automatic delivery command (EC19) or delivers the
residual paper automatically according to the situation.
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