Oce CS2436 User Manual page 624

Maintenance (CS2436-10)
If some sections of the horizontal lines are faint or incomplete, the nozzles for those colors
are clogged.
If horizontal lines are faint or incomplete, follow the steps below and check again for nozzle
clogging.
1.
Clean the Printhead. (See "Cleaning the Printhead (10.2.3).")
2.
Print a test pattern to check the nozzles.
Note
If you repeat these steps several times but the horizontal lines are
still faint or incomplete, contact your Océ dealer.