MP2851 with random black dots

[copyaction]

Looks like the typical worn out PCU symptom but not in this case.
I have already replaced with brand new genuine type 1027 PCU (twice in case the first was defective)
Replaced transfer roller.
Cleaned all drum contacts and drum cavity, which was very clean to begin with, unlike some of this model you see out there.
Only uses genuine Ricoh toner supplied by me.

Not sure where to go next on this one.

[zed255]

Re: MP2851 with random black dots

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Fuser issue, like the pressure lever is lowered for envelope mode.

[anothertech]

Re: MP2851 with random black dots

1+ on the fuser, the teflon roller coating gets worn off.

[copyaction]

Re: MP2851 with random black dots

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Fuser issue, like the pressure lever is lowered for envelope mode.

Sorry guys I forgot to mention I stopped it before the fuser and the dots were already there.
I also checked the upper roller and it has no buildup on it.
So it is happening before it gets to the fuser.

[slimslob]

Re: MP2851 with random black dots

Bad cleaning blade or toner build up in the toner recycler due to a build up of paper lint blocking the opening at the end of the recycler.

[davel]

Re: MP2851 with random black dots

OP said new PCDU.

[luca72]

Re: MP2851 with random black dots

Looks like the typical worn out PCU symptom but not in this case.
I have already replaced with brand new genuine type 1027 PCU (twice in case the first was defective)
Replaced transfer roller.
Cleaned all drum contacts and drum cavity, which was very clean to begin with, unlike some of this model you see out there.
Only uses genuine Ricoh toner supplied by me.

Not sure where to go next on this one.

this usually happens when the pcdu is replaced without replacing the transfer roller, when the replaced pcdu becomes old it enhances the problem of the transfer roller.
you say you have replaced them, I don't know how many prints they have done, but on these types of machines it is necessary to replace pcdu + transfer roller together.

[copyaction]

Re: MP2851 with random black dots

this usually happens when the pcdu is replaced without replacing the transfer roller, when the replaced pcdu becomes old it enhances the problem of the transfer roller.
you say you have replaced them, I don't know how many prints they have done, but on these types of machines it is necessary to replace pcdu + transfer roller together.

Yes brand new entire pcdu (type 1027) and brand new transfer roller both installed yesterday.

[Mark Bbb]

Re: MP2851 with random black dots

Which toner do you use?

[CopyBats]

Re: MP2851 with random black dots

Bad cleaning blade or toner build up in the toner recycler due to a build up of paper lint blocking the opening at the end of the recycler.

If it's not this, take a used working drum in good condition to see if you can recreate the problem. Couple of 1027 have been bad in the box

[copyaction]

Re: MP2851 with random black dots

Which toner do you use?

Only genuine Ricoh 2120d and they get it from me.

[copyaction]

Re: MP2851 with random black dots

If it's not this, take a used working drum in good condition to see if you can recreate the problem. Couple of 1027 have been bad in the box

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.

[slimslob]

Re: MP2851 with random black dots

OP said new PCDU.

Yes brand new entire pcdu (type 1027) and brand new transfer roller both installed yesterday.

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.

[copyaction]

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.

That is a good point which is why I tried a second unit just in case.

[wcanonw]

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?