Power-On Sequence - Canon LBP-2000 Service Manual

CHAPTER 2
C. Power-On Sequence
The following shows the flow of operation from when the power switch is turned on to when the
Printer enters warm-up state.
Power ON
CPU initialized
Option feeder connection checked
/PPRDY signal generated
Communication with video interface started
Fixing heater
ON
Main motor ON
Primary charging (DC+AC), developing bias (AC+DC),
transfer negative bias ON
Fixing assembly temperature 140˚C?
Primary charging (DC+AC), developing bias (AC+DC),
transfer negative bias OFF
Main motor OFF
Is fixing assembly temperature 195˚C (target)
within 25 sec from fixing heater ON?
Standby
2 - 6
The printer inside is
checked for residual paper.
NO
YES
NO
Figure 2-1-4
A jam will be identified if the registration paper
sensor or the delivery sensor detects paper.
Auto delivery will be initiated if the registration
paper sensor detects paper.
The Printer changes to standby status for
the following conditions after the power
switch is turned on to reduce with time:
• 25 sec or more passes and, in addition,
the temperature of the fixing assembly is 150˚C or higher.
• 27 sec or more passes and, in addition,
the temperature of the fixing assembly is 145˚C or higher.