Oki IP-5620 Guide De Référence Rapide page 40

(7) Fix missing print (clogged nozzle)
If missing prints still appear after executing the daily maintenance and setting nozzle map, perform the following
actions.
Missing print may occur when the capping unit is dirty. If missing print cannot be recovered, clean the capping unit
and perform NORMAL cleaning.
Strong cleaning
Perform the NOZZLE PRINT
Fill the cap with ink
Perform the NOZZLE PRINT
Fill the cap with wiper
cleaning liquid
(8) Maintenance for lengthy printing (more than 20 m)
After lengthy printing, dirt that cannot be removed through cleaning may adhere to the print heads (nozzle
surface). To recover from this condition, execute WASH PRINTHEADS.
Through the WASH PRINTHEADS function, the caps are filled with ink to soak the print heads (nozzle surface) in ink
and clear the clogged nozzle.
After this operation, leave the printer 1 to 2 hours.
Then perform NORMAL cleaning.
Perform the strong cleaning when the missing dots
persist after the normal cleaning.
To clear the nozzle clogging, ll the cap with ink and
moisten the print head nozzle surface with ink. After
this operation, hold the Printer for 1 to 2 hours.
Then perform NORMAL cleaning.
To clear the nozzle clogging, ll the cap with wiper
cleaning liquid. After this operation, hold the Printer
for 12 to 18 hours.
Then perform NORMAL cleaning.
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