canon adv c5235 error 20-149

[smiley]

good day guys. this machine has needed to replace its black drum unit because of vertical black lines and working fine. after i change the drum it give me error 20-149 even i have to turn back the old drum it give this error.any idea guys what should i need to check? thanks

[JPiek]

e020-149 is not in the manual... Sure it's not e020-0491 and you mistyped ?

E020 0491 05 Error in Bk Developing Assembly

Error in signal upper limit with ATR sampling detected
value

1. Check toner leak from the Toner Buffer Unit.
2. Check toner level in the Toner Container.
3. Replace the Developing Assembly.
4. Check short-circuit of the harness with the Toner Buffer
Supply Sensor (PS4).

But i'd start with cleaning up any spilled toner and cleaning sensors..

[smiley]

thank you Jpiek. sorry i mistype its e020-0149. i try to clean it but error doesn't dis appear. i replace the black developing unit and the error gone. can it be just the atr sensor or the developer? thanks again.