Service manual

ENWW Chapter 5 Theory of operation 85
Power-on sequence
The the following steps describe the sequence from power-on until the printer enters the standby
(STBY) mode.
1 Power-on.
2 CPU initialization.
3 Formatter communication start.
4 Main motor, reverse motor, and fan drive—Reads the paper-detecting status of each sensor
in the printer immediately before driving the main motor, and assesses a jam if residual
media is detected.
5 Residual paper check—After starting the main motor, detection of residual media in the
printer resumes. If residual media is detected, the printer assesses a jam or automatically
delivers the residual media.
6 High-voltage control—Detects the cartridge presence and cleans the transfer charging roller
after the primary charging ac bias is turned on.
7 Failure or abnormality check—Detects door-open, fan-motor, and fuser-unit failures during
the other sequence periods.