panasonic dp 1510 white patches

[nkprl]

yesterday i finished the service (maintenance kit 120k) on a panasonic 1510 and when i make copies or print from pc i see white patches on a particular area of the paper always at the same spot.
I have changed mag roller, catchers,Assembly, Cleaning Blade, and of course drum , blade etc
Finally i tested another process unit and the same problem.
Any suggestions?

[JustManuals]

Re: panasonic dp 1510 white patches

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[NIKROTAS]

Re: panasonic dp 1510 white patches

I thing you must check the fuser uniint, clean the LSU and check again.

[nkprl]

Re: panasonic dp 1510 white patches

I interrupted the printing and saw the white patches on the paper before enters the fuser.
the same problem occurs when i test print from f1 test pages

[copiman]

Re: panasonic dp 1510 white patches

Can you post an example?

[nkprl]

Re: panasonic dp 1510 white patches

here are 2 images showing the poor quality copier at the lowest part of the paper
1.JPG2.JPG

[gordie]

Re: panasonic dp 1510 white patches

Hi If I remember correctly it is to do with the earthing or ht to the dev unit. Remove sliver plates on the rear of dev unit give them a good clean with an abrasive pad.
Good luck

[copiman]

Re: panasonic dp 1510 white patches

If it were me, I would stop the machine, as best I could, so that the area of print in question is where you can see it on the drum. That way you can see if it is developed on the drum or if its a transfer unit issue. Then go from there. I cannot say I have seen this before.

[nkprl]

Re: panasonic dp 1510 white patches

Copiman i can see it on the drum , when i stop the machine i see an area on the drum with characters not bold like the rest of the surface. Still remind you that i've changed drum , mag roller etc. Tommorow i 'll test another lsu ,,, what else?

and will clean sliver plates as gordie suggested

[copiman]

Re: panasonic dp 1510 white patches

Was it doing it prior to installing maintenance kit the other day?

[nkprl]

Re: panasonic dp 1510 white patches

yes exactly the same with black lines (blade etc)

[copiman]

Re: panasonic dp 1510 white patches

It could be a bias issue like it changing before it should. The top part seems ok and then it fades towards the trail edge, right? You should have somewhere around -430Vdc for bias measured on the front of the developer unit. Did you change developer? If not how many copies on developer?

If you have another laser unit you could use, I would try that. Also ensure you have a good drum ground. Have not seen drum ground issues, but would not rule it out.

[nkprl]

Re: panasonic dp 1510 white patches

ok guys at last i opened the lsu and cleaned the polygon mirror, the machine came to its normal operation.
All the replies were very helpfull thanks.