MP2851 with random black dots

[mikadonovan]

Re: MP2851 with random black dots

After looking at the counter sheet solid triangle, I see that there are white spots on it indicating to me contaminated developer.

[copyaction]

Re: MP2851 with random black dots

hello, the counter page is printed in a4 or a4-R (LTR or Ltr - R), did the unit you replace contain a new developer?

LTR and yes it had new developer and as I mentioned I tried another used unit with only a line but no dots, and it too had dots when placed in this machine.

[copyaction]

Re: MP2851 with random black dots

After looking at the counter sheet solid triangle, I see that there are white spots on it indicating to me contaminated developer.

[luca72]

Re: MP2851 with random black dots

There is no longer any "New" type 1027 PCU from Ricoh. Ricoh went to selling rebuilt Type 1027 a couple of years to meet the demand created by lazy techs using them instead of rebuilding those for later models.

long ago, I also heard this story, it seems to have come from France .. for now those few that we are replacing on machines with type1027 work very well ...

[luca72]

Re: MP2851 with random black dots

I actually had a used 1027 drum with me that just had a thin line on it.
I swapped it in to test and it had the thin line plus all the dots.

[COLOR=rgba(0, 0, 0, 0.54)]
[/COLOR]
[COLOR=rgba(0, 0, 0, 0.54)]
[/COLOR]


..and then friend the only solution and disassemble it, it's so easy and fast, and replace the components one at a time, and try, even the frames! separately, even the black plastic part that electrically connects the charge roller, once a colleague has unsoldered the ball that is inside and I don't remember exactly, but it was a strange defect

[luca72]

Re: MP2851 with random black dots

I actually had a used 1027 drum with me that just had a thin line on it.
I swapped it in to test and it had the thin line plus all the dots.

[COLOR=rgba(0, 0, 0, 0.54)]
[/COLOR]
[COLOR=rgba(0, 0, 0, 0.54)]
[/COLOR]


..and then friend the only solution and disassemble it, it's so easy and fast, and replace the components one at a time, and try, even the frames! separately, even the black plastic part that electrically connects the charge roller, once a colleague has unsoldered the ball that is inside and I don't remember exactly, but it was a strange defect

personally this defect has always seemed to me more an electrical disturbance than something to do with toner

[copyaction]

Re: MP2851 with random black dots

Well I feel dumb now. It was actually happening before the drum. The two foam rollers just passed the paper trays had completely deteriorated.

[luca72]

Re: MP2851 with random black dots

Well I feel dumb now. It was actually happening before the drum. The two foam rollers just passed the paper trays had completely deteriorated.

If I understand correctly, do you say that the powdered foam has joined the drum / charge roller? Looking at the pdf I don't see a repeat from diameter, it seems a little 280k print to have such a problem, but where is it installed on the beach?

[copyaction]

Re: MP2851 with random black dots

If I understand correctly, do you say that the powdered foam has joined the drum / charge roller? Looking at the pdf I don't see a repeat from diameter, it seems a little 280k print to have such a problem, but where is it installed on the beach?

No it was the two foam transport rollers in the paper path.
Toner was sticking to the deteriorated foam and being transferred to the paper prior to it reaching the drum

[luca72]

Re: MP2851 with random black dots

No it was the two foam transport rollers in the paper path.
Toner was sticking to the deteriorated foam and being transferred to the paper prior to it reaching the drum

Ahh, now I understand, interesting!
have you tried cleaning / replacing that roller and the problem is gone?
But was the machine very dirty in general?
Usually that problem is either the pcdu or the transfer roller.
I must point out that I am a cleaning maniac.
Since this lengthens the interventions a little, my boss often tells me on the phone: "ohh, but are you still alive? But what are you making love with machines?"