Replace the old ink cartridge.
Verify that the unit is on. The On button is lit when the unit is on. If the device is not on, press the button to turn on the unit.
Open the print cartridge door. The print carriage moves to the far right side of the unit.
Wait until the print carriage is idle and silent, and then lightly press down on a print cartridge to release it.
When replacing the tri-color print cartridge, remove the print cartridge from the slot on the left.
When replacing the black or photo print cartridge, remove the print cartridge from the slot on the right.
Pull the print cartridge toward you and out of its slot.
If the print cartridge is being removed because it is low or out of ink, recycle the print cartridge.
Remove the new print cartridge from its packaging.
Remove the plastic tape by using the pink pull tab.
Removing the Tape from the catridge.
SOURCE: blk won't print
Do you use generic carts? It could be that the generic ink has clogged the filter in side the printhead.
Do run the machine with original ink carts and try the following:
Press menu then start mono then four times arrow-up. machine will be in maintanance mode. press 7 then 6 then 3. Press start mono. Machine will do a power purge. Press 0 then 9 machine prints test sheet. You might do the power purge a 2nd time. Leave the maintanance mode by pressing 9 then 9.
If you do not have more black blocks the printhead is clogged and cant be fixed anymore!
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