Canon imagePROGRAF iPF780 Basic Guide download pdf (Page 99)

Cause Corrective Action

Color may change slightly even on the same

model of printer if you use a different version of

the firmware or printer driver, or when you print

under different settings or in a different printing

environment.

Follow these steps to prepare the printing environment.

Use the same version of firmware or printer driver.

Specify the same value for all settings items.

Banding in different colors occurs

Cause Corrective Action

The paper feed amount is out of ad-

justment.

Adjust the feed amount.

(See "Adjusting the Feed Amount.") ➔User's Guide

Printing does not proceed smoothly

because print jobs are interrupted

during transmission.

Exit other applications and cancel other print jobs.

In the Control Panel menu, Adj. Pri-

ority is set to Print Length.

Setting Adj. Priority to Print Quality in the Control Panel menu and adjusting the feed

amount may improve results.

(See "Adjusting the Feed Amount.") ➔User's Guide

The Printhead is out of alignment. Adjust the Printhead alignment.

(See "Automatic Adjustment to Straighten Lines and Colors.") ➔ P.79

The Printhead nozzles are clogged. Print a test pattern to check the nozzles and see if they are clogged.

(See "Checking for Nozzle Clogging.") ➔ User's Guide

Streaks may occur if you set the

Print Quality too low.

Choose a higher level of Print Quality in the Advanced Settings of the printer driver and

try printing again.

Printing in Fast or Standard mode is faster and consumes less ink than in Highest or High

modes, but the printing quality is lower.

(See "Giving Priority to Particular Graphic Elements and Colors for Print-

ing.") ➔User's Guide

The type of paper specified in the

printer driver does not match the type

loaded in the printer.

Load paper of the same type as you have specified in the printer driver.

(See "Loading Rolls in the Printer.") ➔ P.15

(See "Loading Sheets in the Printer.") ➔ P.21

Make sure the same type of paper is specified in the printer driver as you have loaded in the

printer.

Press the Stop button and stop printing.

Change the type of paper in the printer driver and try printing again.

Colors in printed images are uneven

Cause Corrective Action

Line Drawing/Text is selected

when printing images in many solid

colors.

In Print Priority in the Advanced Settings of the printer driver, choose Image.

You are printing on paper that curls

easily.

Printed colors may appear uneven on the leading edge of paper that is susceptible to curling.

Select a stronger level in VacuumStrngth in the Control Panel menu to increase suction

against the paper, or specify a leading margin of 20 mm (0.79 in) or more.

(See "Adjusting the Vacuum Strength.") ➔User's Guide

Printed colors may be uneven if you

set the Print Quality too low.

Choose a higher level of Print Quality in the Advanced Settings of the printer driver.

Printing in Fast or Standard mode is faster and consumes less ink than in Highest or High

modes, but the printing quality is lower.

(See "Giving Priority to Particular Graphic Elements and Colors for Printing.") ➔ User's Guide

Color may be uneven between dark

and light image areas.

Select Unidirectional Printing in the Advanced Settings of the printer driver.

iPF780 Series

Banding in different colors occurs

Basic Guide

Troubleshooting Problems with the printing quality

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Canon imagePROGRAF iPF780 Basic Guide Page 99

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