Lexmark XM 7155 white lines

[deputydogg]

The machine is putting white lines from lead edge to trail edge. I just replaced the drum unit 3 weeks ago for the same problem. I've since been told to replace the system board, power supply, transfer roller charge block, and drum at the same time. Has anyone seen this ? Is there a way to determine which part it actually is ?
Thanks,
Dave

[Phil B.]

Re: Lexmark XM 7155 white lines

The machine is putting white lines from lead edge to trail edge. I just replaced the drum unit 3 weeks ago for the same problem. I've since been told to replace the system board, power supply, transfer roller charge block, and drum at the same time. Has anyone seen this ? Is there a way to determine which part it actually is ?
Thanks,
Dave

are you sure nothing is blocking the LSU?

did you measure voltage on the drum/transfer contacts?

what are the Life left of the supplies/parts?

you did vac out the entire machine and clean LSU glass?

upload an example?

[Phil B.]

Re: Lexmark XM 7155 white lines

[QUOTE=Phil B.;821018]are you sure nothing is blocking the LSU?

did you measure voltage on the drum/transfer contacts?

what are the Life left of the supplies/parts?

you did vac out the entire machine and clean LSU glass?

upload an example?

are they using genuine OEM supplies?

[blackcat4866]

Re: Lexmark XM 7155 white lines

If Lex toner cartridges sit on the shelf too long you can get mottling where the seal contacts the developing roller. Dry wiping the developing roller usually solves this. Certain models are easier to get to the developing roller than others. =^..^=

[deputydogg]

Re: Lexmark XM 7155 white lines

OEM supplies.
Drum/Toner are both over 75%.
The problem goes away after installing new drum.

[deputydogg]

Re: Lexmark XM 7155 white lines

[QUOTE=Phil B.;821019]

are you sure nothing is blocking the LSU?

did you measure voltage on the drum/transfer contacts?

what are the Life left of the supplies/parts?

you did vac out the entire machine and clean LSU glass?

upload an example?

are they using genuine OEM supplies?

OEM supplies.
Drum/Toner are both over 75%.
The problem goes away after installing new drum.XM7155.pdf

[Pafasa]

Re: Lexmark XM 7155 white lines

It sure looks like the symptoms created by dirty Laser Slit Glass. Like Phil suggested, have you vacuumed out the machine and cleaned the laser?

[deputydogg]

Re: Lexmark XM 7155 white lines

It sure looks like the symptoms created by dirty Laser Slit Glass. Like Phil suggested, have you vacuumed out the machine and cleaned the laser?

I have vacuumed it out but have not cleaned the laser. I would think if the laser was dirty it would not change the print quality when I put a new drum in.

[Pafasa]

Re: Lexmark XM 7155 white lines

I totally agree with your logic, but I have seen stranger things. It only takes a few seconds to check. Run a q-tip back and forth in the laser slot. see what comes out on the q-tip.

Another thought is the drum/imaging unit is failing prematurely. possibly due to bad toner or too much heat inside the machine?

[Lance15]

Re: Lexmark XM 7155 white lines

Check this thread on the reliability of Lexmark drums:

Faulty Lexmark Imaging Units.

[Pafasa]

Re: Lexmark XM 7155 white lines

Check this thread on the reliability of Lexmark drums:

Faulty Lexmark Imaging Units.

Thanks, lots of info in there that possibly relates directly to the OP's issue.

[blackcat4866]

Re: Lexmark XM 7155 white lines

If Lex toner cartridges sit on the shelf too long you can get mottling where the seal contacts the developing roller. Dry wiping the developing roller usually solves this. Certain models are easier to get to the developing roller than others. =^..^=

I'm sticking with my original diagnosis.

Another consideration: Since this is monocomponent developing, it only takes a little paper dust under the S-blade to create voids on the developing roller. This was particularly common on Samsung boxes. I've taken apart a few of the Samsung cartridges, but I can never seem to get them back together again. =^..^=

[Phil B.]

Re: Lexmark XM 7155 white lines

I'm sticking with my original diagnosis. =^..^=

+1 BC

[deputydogg]

Re: Lexmark XM 7155 white lines

I'm sticking with my original diagnosis.

Another consideration: Since this is monocomponent developing, it only takes a little paper dust under the S-blade to create voids on the developing roller. This was particularly common on Samsung boxes. I've taken apart a few of the Samsung cartridges, but I can never seem to get them back together again. =^..^=

Here is a photo of the "developer roll" after taking the imaging unit apart.
I have cleaned the laser opening with a q-tip with no improvement.
Does anyone have the part # for HVPS & System board ?
Thanks,
Dave

[deputydogg]

Re: Lexmark XM 7155 white lines

I totally agree with your logic, but I have seen stranger things. It only takes a few seconds to check. Run a q-tip back and forth in the laser slot. see what comes out on the q-tip.

Another thought is the drum/imaging unit is failing prematurely. possibly due to bad toner or too much heat inside the machine?

Here is a photo of the "developer roll" after taking the imaging unit apart.
I have cleaned the laser opening with a q-tip with no improvement.
Does anyone have the part # for HVPS & System board ?
Thanks,
Dave