occus
08-11-2020, 02:44 PM
Today i had a C2551 low density error on a bizhub c250i. The popup alert was showing to open and close the front cover and if done after 5 prints it alerts again.
The toner cyan was full but the status was empty. I reset the toner cyan with engine dip switch to full.
After i tryed to increase the toner level with manual ad toner serveral times but it does not help... (from 2% to max 2.5%)
The next step was to fill the hopper and toner again but low density persists.
I disasembled some covers and toner and check the developing unit. It seems there are no toner in the DV. It must be from hopper or backward.
After several tests i tryed to add toner with open shutters and no bottles (by the way, how can i cheat the sensor from the waste toner drive/box? that will be very usefull)
Everythings drives in the hopper, maked a comparison test with all colors how it works. So the hopper function looks good.
Next step:
The theory of operation tells me the toner bottle motor starts only (even you ad manual toner) wenn the toner empty is unblocked. Ok i try to see what happen in the black color and made 50 sheets solid full pattern print to decrease the black toner level. I see the toner bottle motor starts to drive on the right side, and the cyan at the same time for a view mm on the left and stops. The motor is the same for c/k.
On the cyan hopper i take out the toner empty sensor to clean and to unblock and made the same test but the toner bottle motor drive only a quarter...
Now i think its the toner bottle motor or if you look in the parts cataloge the Toner bottle drive assy... nice :(
Has anybody experience with this?
The toner cyan was full but the status was empty. I reset the toner cyan with engine dip switch to full.
After i tryed to increase the toner level with manual ad toner serveral times but it does not help... (from 2% to max 2.5%)
The next step was to fill the hopper and toner again but low density persists.
I disasembled some covers and toner and check the developing unit. It seems there are no toner in the DV. It must be from hopper or backward.
After several tests i tryed to add toner with open shutters and no bottles (by the way, how can i cheat the sensor from the waste toner drive/box? that will be very usefull)
Everythings drives in the hopper, maked a comparison test with all colors how it works. So the hopper function looks good.
Next step:
The theory of operation tells me the toner bottle motor starts only (even you ad manual toner) wenn the toner empty is unblocked. Ok i try to see what happen in the black color and made 50 sheets solid full pattern print to decrease the black toner level. I see the toner bottle motor starts to drive on the right side, and the cyan at the same time for a view mm on the left and stops. The motor is the same for c/k.
On the cyan hopper i take out the toner empty sensor to clean and to unblock and made the same test but the toner bottle motor drive only a quarter...
Now i think its the toner bottle motor or if you look in the parts cataloge the Toner bottle drive assy... nice :(
Has anybody experience with this?