Service manual

Chapter 3
3-9
F-3-5
The machine's sequence of operation is controlled by the CPU on the image processor PCB and the CPU on the DC
controller PCB. Following figure shows the sequential flow, and following table provides descriptions of the periods
involved.
F-3-6
T-3-1
Period Definition Purpose Remarks
WAIT
(wait)
From when the power
is turned on until when
the application of the
primary charging AC
bias is started and
stopped.
The machine's
mechanical and
electrical states are
checked.
A check is made on the
presence/absence of a cartridge
and for paper remaining inside
the machine. The machine also
shifts the WAIT state when the
reader unit is returned to the
home position while power is
on, or after returning from ESS
mode.
flow of paper
rotation of drum
Static image formation block
Cartridge
1.Primary charging 2.Laser exposure
3.Development
4.Transfer
5.Separation6.Fixing
7.Drum cleaning
Registration
Manual feed tray
Cassette
Delivery
Wait Standby
Initial rotation
Print
Last rotation
If a print command is received
during last rotation
If continuous printing is selected
End of printing
Power ON
or
Reader unit in initial position
(While the power remains ON.)
or
Return from ESS mode