MP3351-Light copy quality only when copying, printing density is good.

[tufbnme]

This machine has light density when copying only, either through the ADF or on the platen. The prints and received faxes have great density. I have cleaned the optics very well.
Any idea what I can check next?
Thanks

[zames77]

Re: MP3351-Light copy quality only when copying, printing density is good.

Had this before, I think (and could be wrong) that the machine uses different laser intensity for copying and printing. Replacing the drum fixed my issue.

[sandmanmac]

Re: MP3351-Light copy quality only when copying, printing density is good.

Very common, and many threads here about it.
Generally when the PCU is near the end of it's life.
Either rebuild, or replace it.

[subaro]

Re: MP3351-Light copy quality only when copying, printing density is good.

Is there anyway to increase the scanning density rather than replacing the drum. A similar post of this issue came up a few weeks ago and a few people said the same thing, replacing the drum solve the problem. If as he said the print and fax has good density, then the copy should have fairly good copies if the glass and mirrors and cleaned properly.
And if the drum change solve the problem, then you will have to replace drum prematurely in the future . I don't know the machine, but the logic does not make sense. If a drum is old the density would be obvious.

post with the fix for this issue.

[copyaction]

Re: MP3351-Light copy quality only when copying, printing density is good.

as discussed many times on here including last week replace pcu

[zames77]

Re: MP3351-Light copy quality only when copying, printing density is good.

Is there anyway to increase the scanning density rather than replacing the drum. A similar post of this issue came up a few weeks ago and a few people said the same thing, replacing the drum solve the problem. If as he said the print and fax has good density, then the copy should have fairly good copies if the glass and mirrors and cleaned properly.
And if the drum change solve the problem, then you will have to replace drum prematurely in the future . I don't know the machine, but the logic does not make sense. If a drum is old the density would be obvious.

post with the fix for this issue.

The fix (as posted many, many times on this forum) is to replace the drum (and possibly the dev). Depending on what they've been copying and printing (in terms of coverage) the parts in question will not make life. I don't' know the full details of why copying would be so much fainter than printing, but it's more than likely got something to do with the fact that copying uses the White reference plate to calculate drum charge. Of course, potentially there could be another issue with the scanner or other unit, but the experience of many on this forum indicates that the drum has reached life. In any case, the OP was asking for suggestions, this is one. What's yours?

[Oze]

Re: MP3351-Light copy quality only when copying, printing density is good.

I've had an apprentice clear white balance settings for copying before...he did an Engine clear for some stoopid reason and forgot to re-enter birth certificate settings.
I attended and entered the settings and BLAM....all good.

[subaro]

Re: MP3351-Light copy quality only when copying, printing density is good.

In any case, the OP was asking for suggestions, this is one. What's yours?

If you read my repy, you would see i said at least should try to increase density of the scanner and check results.

well OZE posted a solution he found by accident. Yes, engine resets do sometime produce some results when all esle fails. Did anyone try this before. I would. and post the result. but i don't work on these machines.

I would also take the drum that you replaced to solve the problem and put it into a machine that has no light copy issue and see the results. The response of the prints ok and copy bad defies the logic of how the machines work. either the scanner has a weak point or firmware or something else.

[tufbnme]

Re: MP3351-Light copy quality only when copying, printing density is good.

Thanks for all the suggestions, the pcu is new, no change. I should have mentioned it but didn't think it would make a difference since the prints a fine. I will try resetting the white balance.

[Elmo]

Re: MP3351-Light copy quality only when copying, printing density is good.

it is a common problem with the mp2550/3350/1 series
good quality prints poor quality copies
if u try a scan you will see quality is ok therefore no problem with the optics
Always use original drum for this model
clean the id sensor and run developer initialize after replacing drum unit

[wyo19]

Re: MP3351-Light copy quality only when copying, printing density is good.

for some reason that series plus I think next after had issues with great prints,but crappy copies/scanned images.
We find it to be one of two solutions.
1) PCU ASSEMBLY we never rebuild,just use TYPE 1027 on all models we can get up to 90K more cost effective and reliable
2) LD Unit which they no longer use and call it an IMAGE Unit.

hope this helps....

[tufbnme]

Re: MP3351-Light copy quality only when copying, printing density is good. SOLVED

for some reason that series plus I think next after had issues with great prints,but crappy copies/scanned images.
We find it to be one of two solutions.
1) PCU ASSEMBLY we never rebuild,just use TYPE 1027 on all models we can get up to 90K more cost effective and reliable
2) LD Unit which they no longer use and call it an IMAGE Unit.

hope this helps....

Thanks Wyo19. It was the laser unit. Not sure why it makes a difference between prints and copies but it does.