Canon iPF800 Series Service Manual Download

Page: 119 / 320

Chapter 2

2-15

2.2.4 Print Position Adjustment Function

0012-6313

iPF810 / iPF820

This printer supports a print position adjust the vertical and horizontal print position and the bidirectional print position of the print head mounted on the carriage
and the feedrate.
Print position adjustment work in two modes: automatic adjustment, in which print position adjustment patterns printed are detected by a multi sensor attached to
the lower left part of the carriage, and manual adjustment, in which print position adjustment patterns that are slightly modified from one another are printed, so
that visually verified adjustment values can be set from the operation panel.
To make print position adjustment, A3-or-larger-sized roll media or cut media are needed.

2.2.5 Head Management

0012-6314

iPF810 / iPF820

This printer supports a nozzle check function to spot non-discharging nozzles in the printhead.
When the printer detects a non-discharging nozzle. it starts cleaning the printhead automatically to correct its discharge failure. If cleaning does not work, the printer
backs up the non-discharging nozzle with an alternative nozzle automatically to ensure unfailing print performance.

Detection timings (automatic):
Power-on, carriage cover open detection, print start (check timing variable by selecting Nozzle Check from the system menu).

2.2.6 Printhead Overheating Protection Control

0012-6315

iPF810 / iPF820

When an abnormal temperature rise in the printhead is detected, overheating protection control launches.
Overheating could occur in the printhaed after a spell of print operations without the nozzles being filled with inks.
Overheating protection control is implemented on the basis of the temperature detected by the head temperature sensor for each nozzle. When an abnormal temper-
ature is detected in any nozzle train, overheating protection control is exerted at one of two levels according to that temperature.

Protection level 1:
If the head temperature sensor (DI sensor) detects a temperature higher than the protection temperature, it halts the carriage temporarily at the scan end position in
the direction of travel according to the carriage scan status.
Printing resumes when the printhead radiates naturally to cool down to below a predetermined temperature or when 30 seconds or longer have elapsed since the
detection of the temperature higher than the protection temperature.

Protection level 2:
If the head temperature sensor (DI sensor) detects a temperature higher than the abnormal temperature, the printer shuts down the print operation immediately,
moving the carriage to the home position for capping, with an error indication on the display.

2.2.7 Pause between Pages

0012-6320

iPF810 / iPF820

An inter-page function is available to prevent ink rubbing, which keeps paper just printed hanging above the platen and waiting for a predetermined period of time
before delivery.
The wait time is user-programmable from the print driver. This feature is particularly useful on paper that takes time to dry after printing, such as films.

2.2.8 White Raster Skip

0012-6322

iPF810 / iPF820

This printer supports a white raster skip function to bypass carriage scanning in a consecutive sequence of voids in print data for added throughput.

2.2.9 Sleep Mode

0012-6324

iPF810 / iPF820

The printer has sleep mode to save on its standby power requirement.
The printer transitions to sleep mode automatically when it has been left idle or no print data has been received for a predetermined period of time while the printer
is online or offline.
The printer exits sleep mode when any operation panel key is activated or print data is received from the host computer.
The time to transition to sleep mode is variable from the operation panel (Default: 5minutes).

2.2.10 Hard Disk Drive

0013-9239

iPF810 / iPF820

This printer features a hard disk drive, which provides the following functions.
- Early release of the host computer
- Error recovery
- Job preservation
- Preserved job print
- Job queue handling

1) Early release of the host computer

Each print job received from the host computer is preserved to the hard disk drive attached to the printer, so the printer can proceed with independent printing,
releasing the host computer before the print job completes.

2) Error recovery

If a print job aborts as a result of any print problem, such as a paper jam or insufficient paper, the printer reloads the print job stored on the hard disk so it can resume
the print job without having to retransmit the job from the host computer to it.