Remove the cartridges and do a through cleaning use cotton bud to clean the cartridge nozzles...clean the service station area well(this is where the cartridge rests on the side of the printer)....wipe of any spilled...excess ink you can see....
LJ 2600N printer print only black while all cartridges are 75% full, that is on test...
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LJ 2600N printer print only black while all cartridges are 75% full, that is on test test/configuration page.