Sequence Of Basic Operation - Canon LBP-2000 Service Manual

CHAPTER 2
B. Sequence of Basic Operation
The sequence of the printer operation is controlled by the microprocessor found on the DC control-
ler PCB. The conditions and the purposes of the sequence of each interval at power-on and during
printing are as follows:
• At Power-On
From when the power switch is turned
WMUP
on to when the surface temperature
(warm-up)
of the fixing roller reaches 140˚C.
wait
From when warm-up ends to
WMUPR
when the main motor is turned on
(warm-up
and then off.
rotation)
From when the warm-up interval ends
to when the /PRNT signal arrives
from the video controller. Or, from
when LSTR ends to when the /PRNT
signal arrives from the video
controller or the power switch is
turned off.
STBY
(standby)
2 - 2
Table 2-1-1
Interval Purpose
To heat the fixing roller and to
put the Printer to warm-up
rotation state.
To make the surface temperature
of the fixing roller even. Also, to rid
the drum surface of potential and
to clean the transfer charging roller.
To control the fixing roller to
standby state, thereby keeping
the Printer ready for printing.
Remarks
The level of remaining
toner is detected during
this interval.
After the power switch is
turned on, the Printer
moves to standby state
for the following conditions
to reduce wait 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.