Troubleshoot Print Quality Issues; The Print Is Light; Missing Dots Are Found At The Beginning Of Printing - Oki IP-7900-21 Advanced Operation Manual

Troubleshoot print quality issues

This section describes the hint for you for one symptom, to get good image quality with the Printer.
Take appropriate actions according to the printout's symptom.
When several actions are described, they are arranged in the order of effectiveness. Therefore, you are
recommended to take actions from the top and confirm the effect on the improvement. (Note that all the
described actions are not always necessary to solve the problem.)

The print is light.

Cause
The density setting does not
l
match.
The operating environment is
l
outside the specification of the
Printer.
Media is not selected properly.
l

Missing dots are found at the beginning of printing.

Cause
Outside the operating
l
temperature/humidity range
Obstructions in the nozzle
l
surface path
56
IP-7900-20/21/7700-20/21 Advanced Operation Guide
Set density to HIGH DENSITY if high density printing is required, such as
when using backlit banner media. (
Raise the ambient temperature to 15°C or more (20 to 25°C recommended) to
warm the Printer adequately
Check the media selection. ( Basic Operation Guide
Use the Printer within the operating temperature/humidity range.
( Basic Operation Guide
Check the obstructions in the nozzle surface path, with the order of on: platen,
media edge guards, spittoon case, capping unit, and wiper blade, and remove the
obstruction and stains.
Lint or paper fibers caused by a ragged media may touch the print head, which
may cause missing dots. Replace the media with a media with no lint or paper fiber.
Check that the exhaust fan filter is not encrusted with dust. If it is, replace the filter.
( Basic Operation Guide
Solution
page 35 )
page 54 )
Solution
page 17 )
page 77 )