aficio mp w2401 black random dots !

[jakani]

hello everyone ,

i have this machine aficio mp w2401 since two years now i changed the drum once everything else works just fine
anyway lately it started printing black random dots when printing or when scanning ,

anybody has an idea about this ! what could be causing it ?

here is a counter attached to get a clear idea about the problem

scan.pdf

thank you in advance for suggestions

[TonerMunkeh]

Re: aficio mp w2401 black random dots !

Looks like it's time for a full PM including developer.

[zed255]

Re: aficio mp w2401 black random dots !

Dirty charge and grid wires.

[Polarbear]

Re: aficio mp w2401 black random dots !

Any chance you worked on the transfer corrona assembly?

I had that a while back, and it turned out that when the corrona box was reinstalled after cleaning, it was not inserted correctly into the guides which meant that the corrona box was sitting higher than it should.

This caused all kinds of image problems - dots, streaks....

[jakani]

Re: aficio mp w2401 black random dots !

Looks like it's time for a full PM including developer.

thank you for replying do you mean that i need to change the developer

Dirty charge and grid wires.

thank you very much for replying

i will do a corona wire cleaning and see

Any chance you worked on the transfer corrona assembly?

I had that a while back, and it turned out that when the corrona box was reinstalled after cleaning, it was not inserted correctly into the guides which meant that the corrona box was sitting higher than it should.

This caused all kinds of image problems - dots, streaks....

thank you very much for for your suggestion

no i didn't work on corona at all it been a year since i touched anything inside it

[TonerMunkeh]

Re: aficio mp w2401 black random dots !

It depends what the PM counters show for the parts. If they are over life, replace them.

[Ballas]

Re: aficio mp w2401 black random dots !

It depends what the PM counters show for the parts. If they are over life, replace them.

Hi, the problem with the MPW series mashines is that customers hardly ever print the surgested monthly volume on the units, so you end up with DEV that has not reached yeild but goes off with time. The yeild on Mpw2401 DEV is 27500 meters. Random Black spots can also be the Fuser Cleaning roller. You dont have to replace it, just take it out(Fuser have to come out partially to get to the screws) and scrape it with a sharp knife.

If it is the developer, witch is the most likely cause, you can get away for a short while by ajusting the DEVELOPMENT BIAS is SP Modes, but the correct way is to replace Dev. It takes 2 bags, put one and first cycle the machine for a short while before putting the second bag.

If it is the Fuser cleaning roller, the random black dots can rub off.

[TonerMunkeh]

Re: aficio mp w2401 black random dots !

Hi, the problem with the MPW series mashines is that customers hardly ever print the surgested monthly volume on the units, so you end up with DEV that has not reached yeild but goes off with time. The yeild on Mpw2401 DEV is 27500 meters. Random Black spots can also be the Fuser Cleaning roller. You dont have to replace it, just take it out(Fuser have to come out partially to get to the screws) and scrape it with a sharp knife.

If it is the developer, witch is the most likely cause, you can get away for a short while by ajusting the DEVELOPMENT BIAS is SP Modes, but the correct way is to replace Dev. It takes 2 bags, put one and first cycle the machine for a short while before putting the second bag.

If it is the Fuser cleaning roller, the random black dots can rub off.

I agree wholeheartedly. Worn developer most likely is the cause but the drum might be pulling dev, wearing the cleaning blade, that's why I suggested a full PM so you're starting with a nice, clean machine.

[jakani]

Re: aficio mp w2401 black random dots !

It depends what the PM counters show for the parts. If they are over life, replace them.

Hi, the problem with the MPW series mashines is that customers hardly ever print the surgested monthly volume on the units, so you end up with DEV that has not reached yeild but goes off with time. The yeild on Mpw2401 DEV is 27500 meters. Random Black spots can also be the Fuser Cleaning roller. You dont have to replace it, just take it out(Fuser have to come out partially to get to the screws) and scrape it with a sharp knife.

If it is the developer, witch is the most likely cause, you can get away for a short while by ajusting the DEVELOPMENT BIAS is SP Modes, but the correct way is to replace Dev. It takes 2 bags, put one and first cycle the machine for a short while before putting the second bag.

If it is the Fuser cleaning roller, the random black dots can rub off.

I agree wholeheartedly. Worn developer most likely is the cause but the drum might be pulling dev, wearing the cleaning blade, that's why I suggested a full PM so you're starting with a nice, clean machine.

thank you very much for replying and your suggestions

i order the developer i'm going to replace it and see

one thing i noticed is that those black dots is only printed in the morning or when i start the machine but during the day the prints are clean !

[gkalman2004]

Re: aficio mp w2401 black random dots !

thank you very much for replying and your suggestions

i order the developer i'm going to replace it and see

one thing i noticed is that those black dots is only printed in the morning or when i start the machine but during the day the prints are clean !

I worked on a MP W2400 with same problem and nothing changed after i cleaned the Charge Corona Wire, Transfer Corona Wire,Separation Corona Wire and changed the Developer my problem not changed. I think in the morning time was more humidity in the room , so i move the machine from the semi-basement to the ground floor and i wait to see if the problem has been resolved . After one week when the client change again the paper i discovered the real reason.. because humidity the paper have moisture on the surface part but after only 2-3 print everthing was ok.(the paper was deposited also in the semi-basement). In summer time this does not happen

[slimslob]

Re: aficio mp w2401 black random dots !

Looks like it's time for a full PM including developer.

thank you for replying do you mean that i need to change the developer

Full PM means that you replace the drum, developer and cleaning blade. It includes replacing or rebuilding the charge corona. You also might need to rebuild the fusing unit.

[Brianneoe]

Re: aficio mp w2401 black random dots !

ad020089 and 90. charge grid wires and main wire. save the developer until you get background. cleaning the wires will get you out the door but not down the block. bring two sets just in case you break some. i hope you have good eye sight, i need to rebuild them under a magnifying glass with a fl lamp.

[gkalman2004]

Re: aficio mp w2401 black random dots !

ad020089 and 90. charge grid wires and main wire. save the developer until you get background. cleaning the wires will get you out the door but not down the block. bring two sets just in case you break some. i hope you have good eye sight, i need to rebuild them under a magnifying glass with a fl lamp.

Totally agree , (the user write this happen in the morning only) clean the 2 wires and check the paper for humidity first. (Check like this, runs and cut a meter from the roll and print after test page)

[Ballas]

Re: aficio mp w2401 black random dots !

Hi,
You might also want to use the tray heaters to prevent humidity, the swith is on the opposite side of the M/C on/off sw. Heaters will stay on as long as the heater sw is on.

[Polarbear]

Re: aficio mp w2401 black random dots !

Hi,
You might also want to use the tray heaters to prevent humidity, the swith is on the opposite side of the M/C on/off sw. Heaters will stay on as long as the heater sw is on.

Correct me if i'm wrong, but don't the tray heaters work when the machine is OFF and not when the machine is ON?