Head Management; Overheating Protection Control Of Printhead; Pause Between; White Raster Skip - Canon W6400 Series Service Manual

Chapter 2

2.2.5 Head Management

This printer has a head management function to detect any non-discharging nozzle. When a non-discharging nozzle is detected, the printer performs the
printhead cleaning operations. Also, changing the mask pattern used for printing automatically allows non-discharging nozzles to be backed up by other
nozzles. If the non-discharging nozzles cannot be backed up, a "Check Printhead" message is displayed.
Detection timing:
- Power On
- When starting print operations after printing every 10 sheets. *1
- When the head is replaced (when carriage cover is detected)
*1: Can be changed by selecting "System Setup" > "Nozzle Check" from the Main Menu.
MEMO:
If the "Check Printhead" message is displayed, select "Head Cleaning" from the Main Menu. Replace the printhead with a new one if performing a head
cleaning does not eliminate this error.

2.2.6 Overheating Protection Control of Printhead

This printer is provided with an overheating protection control function that detects abnormally high temperatures in the printhead.
The printhead can overheat, for instance, when the printing process continues for some time with no ink supplied to the printhead nozzles. The overheating
protection control function prevents a printhead nozzle from becoming permanently clogged or damaged due to excessive heat.
The overheating protection control process is based on the detected temperature of the head temperature sensors in each nozzle array. If overheating is
detected in a single nozzle array, control is performed in one of the two stages below according to the temperature.
Protection level 1:
If the head temperature sensor detects a temperature above 80 deg C (*1), the printer allows the carriage to continue in the direction of its scanning pass
and then stops it at the scan end position. The wait control is activated to allow the heat to dissipate.
Printing resumes when the temperature drops below 80 deg C (*2).
*1 When using MBk ink, when the Bk nozzle head temperature sensor detects temperature of 70 deg C or higher.
*2 When using MBk ink, when the Bk nozzle head temperature sensor detects temperature below 70 deg C.
Protection level 2:
If the head temperature sensor detects a temperature above 120 deg C, the printer immediately stops the printing operation, and the carriage returns to the
home position where capping is performed. An error message is shown on the display.
2.2.7 Pause between Pages
To prevent ink blots from forming, this printer discharges printed pages so that they hang down from the platen and dry and is provided with a Pause
between Pages function for discharging sheets after a specified wait time. The wait time depends on the sheet type with default set to 0 to 3 minutes. This
function can also be set from the Main Menu or with the printer driver and is particularly useful for film-type and other sheets that need extra time to dry.

2.2.8 White Raster Skip

To improve the printing throughput, this printer incorporates a White Raster Skip function for skipping the carriage scan operation for continuous blank
segments of print data.

2.2.9 Sleep Mode

This printer has a Sleep mode for reducing the standby power.
The printer automatically enters Sleep mode (Power Save mode) when there are no user operations and no print data has been received for a preset period
of time in the Online or Offline mode. The printer wakes from Sleep mode whenever the user performs any key operations on operation manual or print
data is received from the host computer.
The time until the printer enters Sleep mode can be changed from the operation panel.
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