MP C3500 Magenta drum problem

[Butrus]

Dot on magenta drum apeared.I changed the drum..good for awhile...apeared again.
Changed the whole unit with developer and everything...good for awhile...apeared again.
Changed the drum again and whole transfer belt unit(on inspection the old one looked fine) ...good for awhile...apeared again.

The dot is always visable on the drum...looks like mechanical defect...like little cut...

Its always only on magenta drum...

Any suggestions?

THANX!!!

[TonerMunkeh]

Re: MP C3500 Magenta drum problem

Is the dot always in the same place when you replace the drum?

[Butrus]

Re: MP C3500 Magenta drum problem

No.
Sometimes also multiple dots....

[HitMan]

magenta drum chip

Maybe check that the other units aren't spreading any dirt through the machine. Maybe vac out the drum units before magenta. Make sure there's nothing stuck on the magnetic roller in the development unit. Could be hard toner or even a staple?

[TonerMunkeh]

Re: MP C3500 Magenta drum problem

With how it's blown out it looks like an arc mark. Are there any ITB related SC codes?

[HitMan]

Re: MP C3500 Magenta drum problem

I know you said you replaced the complete unit but what's the condition of the charge roller? Any marks on the roller also?

[Butrus]

Re: MP C3500 Magenta drum problem

Charge roller is good,no damage
No SC codes
What is arc mark?

[HitMan]

Ark would be from a charge wire but these machines have charge rollers.

[slimslob]

Re: MP C3500 Magenta drum problem

Have seen this frequently when using cheap toner. Use only Genuine Ricoh.

Also, toner density could be too high. If you are using Genuine Ricoh, make the adjustments in the attached file.Service Program (SP) Settings.pdf

[HitMan]

Nightmare fault

What about the drive gears for the magenta pcu? The ones the pcu engages with. The white gears at the back of the machine next to the rj45 type connector for the pcu. Could it be that the recycling unit at the pcu cannot get rid of the toner?

[UCPrint]

Re: MP C3500 Magenta drum problem

Does the mark on the drum rub off or is their a nick on the drum?
Did you replace the dev unit or just redev it? if you just re deved it then its possible to still have toner debris in the unit which will contaminate the charge roller.

[meldwo]

Re: MP C3500 Magenta drum problem

Dot on magenta drum apeared.I changed the drum..good for awhile...apeared again.
Changed the whole unit with developer and everything...good for awhile...apeared again.
Changed the drum again and whole transfer belt unit(on inspection the old one looked fine) ...good for awhile...apeared again.

The dot is always visable on the drum...looks like mechanical defect...like little cut...

Its always only on magenta drum...

Any suggestions?

THANX!!!

replace the PCU and toner

[Butrus]

Re: MP C3500 Magenta drum problem

I replaced the PCU
The nick is on the drum...can not be whiped off
I also replaced the whole dev. unit,not yust developer...

Toner is the same for all...CMYK
I have problem only with M

[TonerMunkeh]

Re: MP C3500 Magenta drum problem

Is the screw lock on the front of the PCU cover? Could it be possible it is missing, someone is deliberately taking the drum unit out and damaging it?