Canon LBP6670dn Series Service Manual page 18

2
Technology > Sequence of Operation > Outline
Basic Operation
Function Structure
The function structure of the printer contains the following five systems:
• Engine control system
• Laser scanner system
• Image-formation system
• Media feed system
• Option
ENGINE CONTROL
SYSTEM
2 Technology > Sequence of Operation > Outline
LASER SCANNER SYSTEM
IMAGE-FORMATION SYSTEM
MEDIA FEED SYSTEM
OPTION
F-2-1
Sequence of Operation
Outline
The operation sequence is controlled by the DC Controller in the engine control system.
Operations for each period of a print operation from the machine is turned on until the motor
stops rotating are described below.
Period Duration
WAIT From the time power switch is
turned on or the dooe is closed
unitil the printer gets ready for a
print operation.
STBY From the end of WAIT or LSTR
(Standby) period until either the print
command is received the main
controller or the power switch is
turned off.
INTR From the time print command is
(Initial rotation) received from the main controller
unit the temperature of the
fixing unit reaches its targeted
temperature.
PRINT From the end of INTR period unit
the last media completes the fixing
operation.
LSTR From the end of PRINT period unit
(Last rotation) the motor stops rotationg.
2-2
Operation
Brings the printer to printable condition.
The rpinter performs the following during this
period:-Detects cartridge presence.
Maintains the printer in printable condition.
Starts up each high-voltage biases, laser
scanner and fixing unit in preparing for print
operation.
Forme the image on the photosensitive drum
based on the VIDEO signals from the main
controlloer.
Transfers and fuses the toner image to the
print media.
Moves the last printed sheet out of the printer.
Stops laser scanner operation and high-
voltage biases output.
The printer enters INTR period as the LSTR
period is completed if the main controller
sends another print command.
T-2-1
2-2