Print Driving; Firmware; Operation Sequence At Power-On; Operation Sequence At Power-Off - Canon imagePROGRAF iPF5000 Series Service Manual

Chapter 2

2.1.2 Print Driving

During printing, print signals and control signals are issued to the printhead via the carriage PCB in order to discharge ink from the nozzles.
On a printhead, six arrays of nozzles are provided in six arrays in a staggered pattern.
This printer uses a pair of printheads.
(The Y, PC, C, PGy, Gy, MBk, PM, M, Bk, R, G, B nozzles are mounted in this order from the left.)
Even-numbered nozzle data and odd-numbered nozzle data -- which are print signals -- are sent to each nozzle array in sync with the data sending clock and data
latch pulse timings.
Drive control signals include a Heat Enable signal and a Sub Heat Enable signal. The Heat Enable signal is used to discharge ink from nozzles. The Sub Heat Enable
signal is used to raise the printhead temperature to a suitable value to maintain the ink discharge amount constant.

2.2 Firmware

2.2.1 Operation Sequence at Power-on

Shown below is the flowchart of the initialization sequence from the moment the power is turned on to the moment the printer enters the online state. The time
required for initialization is less than 1 minute*.
* This time does not include the time required for supplying ink and cleaning which takes place after the printer has been left unused for an extended period of time.

2.2.2 Operation Sequence at Power-off

Turning off the power cuts off the voltage to all drive systems. At this time, the firmware starts the power-off sequence as shown below.
This printer immediately suspends all operations in progress and stops whenever the power cord is unplugged or a cover such as the top cover is opened. In this
2-2
Power Button ON
Device/resource
initializarion
Engine status check
Printhead/
ink tank check
Media feed system
initialization
Recovery system
initialization
Carriage position
initialization
Remaining ink level detection/
Waste ink level detection
Power-on
automatic recovery operation
Capping
Waiting for print operation
Initialization of software
Initialization of various devices
Engine startup status check
Previous power-off status check,etc.
Printhead installation status check
Ink tank installation status check
EEPROM check
Cassette pick-up unit initialization
Roll feed unit initialization
Roll feed unit initialization
Sensor check
Recovery system return to origin
Sensor check
Carriage motor return to origin
F-2-2
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0012-6493
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