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Your toner cartridge is probably getting low. Toner is actually a powder, and it can get settled during shipments, bringing it home, etc etc.
Take out the black toner and give it a gentle side-to-side shake a few times and pop it back in.
That should help.
replace the black pcu(drum unit). the life of the pcu(s) are 15k each(blk & col) . the machine will work but copy quality will reduce and the error will be there. replacing the cartridge has nothing to do with this error.
Depending on the age of the model, it could be a couple of things. ***Never touch the drum or expose it to bright light*** The drum unit is bad. It's the shiny brightly-colored large roller in the center of the machine. On most recent smaller machines like this on it's integrated into the toner cartridge. Check it out. If it has toner build up on the ends, it's bad. or The corona wires need cleaning. Some machines have a small slide that moves from one side of the printer to the other which cleans the hidden corona wires. It's usually brightly colored.
The corona wires are also integrated into the toner cartridge in many smaller machines
call ricoh serviceman he/she can fix it.
Defective tank full sensor
• Tank full lever bent or broken
• Incorrect ink suction
1. Check the harness of the tank full sensor.
2. Replace the GJ engine.
3. Replace the maintenance unit.
• The position of the tank full lever
does not stay at the tank full position
after ink initialization or air releasing.
• The position of the tank full lever is
not detected at ink suction.