Xerox 7500 DN Phaser - White Streak Issue on Magenta

[mikewaterloo]

Hi All,

I'm trying this forum to see if I can find some help on an issue I'm having with my Xerox Phaser 7500 DN. The unit was new in late 2009 and has had very light use in all reality, as it was our backup printer from 2011 til now. I've put the machine back into use and it seems to have an issue on the Magenta color only. I followed the instructions I found on the support site - Replaced magenta toner cartridge and imaging unit. But haven't had any luck. I'm hoping someone here can help as my local Xerox dealer said they do not work on Phaser printers as they are not trained on them and Xerox is very particular on that. I can't see that it should be a fuser issue since it only happens on the magenta. But I can't seem to find anything else to try.

Is there anything I can check or do to try to service this printer? I use it primarily as a graphic design production unit. I don't want to put another $500 into it for them to tell me it needs a lot more and then have to buy another unit. I've already spent a couple hundred dollars to get it to this point. I have read a couple posts on different machines that have something called a master charge grid and a transfer roll but not sure if that's something that can be "cleaned" etc.

Any help is appreciated!

Thanks,
Mike

IMG_8597e.jpg

[Phil B.]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Hi All, I'm trying this forum to see if I can find some help on an issue I'm having with my Xerox Phaser 7500 DN. The unit was new in late 2009 and has had very light use in all reality, as it was our backup printer from 2011 til now. I've put the machine back into use and it seems to have an issue on the Magenta color only. I followed the instructions I found on the support site - Replaced magenta toner cartridge and imaging unit. But haven't had any luck. I'm hoping someone here can help as my local Xerox dealer said they do not work on Phaser printers as they are not trained on them and Xerox is very particular on that. I can't see that it should be a fuser issue since it only happens on the magenta. But I can't seem to find anything else to try.

Is there anything I can check or do to try to service this printer? I use it primarily as a graphic design production unit. I don't want to put another $500 into it for them to tell me it needs a lot more and then have to buy another unit. I've already spent a couple hundred dollars to get it to this point. I have read a couple posts on different machines that have something called a master charge grid and a transfer roll but not sure if that's something that can be "cleaned" etc.
Any help is appreciated!
Thanks,
Mike[ATTACH=CONFIG]39995[/ATTACH]

sounds like the laser glass for the M slot is tonered up... pull drum and clean

[mikewaterloo]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

sounds like the laser glass for the M slot is tonered up... pull drum and clean

Hi Phil,

Thanks for your response. I've pulled the drum and wiped clean, but it did not make any difference. In addition this is a new image drum, but I get the same mark. Is there somewhere inside the machine I should be looking to wipe clean?

I just used a dry smooth, cotton cloth to dry. I did not use any solvents, water or alcohol. I assumed that I shouldn't. I couldn't see anything inside the unit that I should be cleaning.

Any guidance is appreciated.

Thanks,
Mike

[magicaljake]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Hi Phil,

Thanks for your response. I've pulled the drum and wiped clean, but it did not make any difference. In addition this is a new image drum, but I get the same mark. Is there somewhere inside the machine I should be looking to wipe clean?

I just used a dry smooth, cotton cloth to dry. I did not use any solvents, water or alcohol. I assumed that I shouldn't. I couldn't see anything inside the unit that I should be cleaning.

Any guidance is appreciated.

Thanks,
Mike

if its not the LED print head its most likely the magenta developer unit

[rockdude]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Magicaljake is correct...

LED print head or magenta developer unit.

You did use the wand to clean the led correct??

[Phil B.]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Hi Phil, Thanks for your response. I've pulled the drum and wiped clean, but it did not make any difference. In addition this is a new image drum, but I get the same mark. Is there somewhere inside the machine I should be looking to wipe clean?
I just used a dry smooth, cotton cloth to dry. I did not use any solvents, water or alcohol. I assumed that I shouldn't. I couldn't see anything inside the unit that I should be cleaning.
Any guidance is appreciated.
Thanks, Mike

Mike, sorry just looked up that model...
this is an LED model .. meaning once you pull the drums... look into that cavity, and UP. there should be a thin bar running front to back... USE a tissue and running front to back clean that LED bar
Also.. when you pull the drums... there should be a FRAGILE belt(either above or below the drums) see if the belt is marked in that area.
on the door below the fuser ( from memory ) there should be a roller ( firm foam/rubber) ...look on that see if there are marks on the roller in that spot.

BE CAREFUL what you wipe a drum with.. even paper towels can scratch the surface. NO cleaners except 70% Rubbing Alcohol on drums IF AND ONLY IF there is gum residue from labels.

Frankly it sounds like the LED bar for the color is crudded ( yes tech term ) up

good luck..gives thanks..and likes if this helps you out

[mikewaterloo]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Hi Guys,

I did use the little wand to clean the LED Print head. (This model has a piece that you're supposed to pull out and push back in 3-4 times to try to clean it.) I tried this several times - like 3 or 4 sets of 25.

It's a bit tricky to see all the way to the opposite end where the marks appear. It does not appear to have any marks, but like I said, it's hard to see. I'm not 100% if it's really dissippating or not. But it appears to be, though there are more streaks now, they are all in effect lighter.

Does this help lead an indication that it's either the LED Print Head vs. the magenta developer, and do you think it's possible for me to replace a LED Print Head myself versus having a tech? Like I said, my local Xerox dealer is refusing to help. Xerox said they could help for $300/hr. Seems like I'd likely be half way to a new printer after 2 hours and parts.

IMG_8655e.jpg
(Image: Left side when I first posted. Second, after many clean attempts and wiping as much of the interior area as I could with soft, dry cotton.)

Thanks,
Mike

(Waterloo, IA 50701 in case you know of anyone nearby.

[mikewaterloo]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Hi Phil,

I tried your notes again... but I don't see anything on it. But I did clean it.

Also - I 'm not sure what the FRAGILE belt would be. I've taken some pictures inside the unit to see if that would help. I've added some notes on it, because I don't see an LED bar above where the Imaging Drum goes. Unless I'm completely missing it... which could happen!

Appreciate your help!

Thanks,
Mike

Mike, sorry just looked up that model...
this is an LED model .. meaning once you pull the drums... look into that cavity, and UP. there should be a thin bar running front to back... USE a tissue and running front to back clean that LED bar
Also.. when you pull the drums... there should be a FRAGILE belt(either above or below the drums) see if the belt is marked in that area.
on the door below the fuser ( from memory ) there should be a roller ( firm foam/rubber) ...look on that see if there are marks on the roller in that spot.

BE CAREFUL what you wipe a drum with.. even paper towels can scratch the surface. NO cleaners except 70% Rubbing Alcohol on drums IF AND ONLY IF there is gum residue from labels.

Frankly it sounds like the LED bar for the color is crudded ( yes tech term ) up

good luck..gives thanks..and likes if this helps you out

[magicaljake]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Not entirely sure if you have a manual or if you feel comfortable with this. you could swap the LED print head with the one with another color and see if the issue follows along with it. If it does (and you know its clean) it would be the LED print head. If not it would be the magenta developer unit.

[magicaljake]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Hi Guys,

I did use the little wand to clean the LED Print head. (This model has a piece that you're supposed to pull out and push back in 3-4 times to try to clean it.) I tried this several times - like 3 or 4 sets of 25.

It's a bit tricky to see all the way to the opposite end where the marks appear. It does not appear to have any marks, but like I said, it's hard to see. I'm not 100% if it's really dissippating or not. But it appears to be, though there are more streaks now, they are all in effect lighter.

Does this help lead an indication that it's either the LED Print Head vs. the magenta developer, and do you think it's possible for me to replace a LED Print Head myself versus having a tech? Like I said, my local Xerox dealer is refusing to help. Xerox said they could help for $300/hr. Seems like I'd likely be half way to a new printer after 2 hours and parts.

[ATTACH=CONFIG]39997[/ATTACH]
(Image: Left side when I first posted. Second, after many clean attempts and wiping as much of the interior area as I could with soft, dry cotton.)

Thanks,
Mike

(Waterloo, IA 50701 in case you know of anyone nearby.

i apologize for not taking a better look at this attachment you shared earlier. The fact that the second void (not a streak) has changed position would seem to show you are on the correct path.

[rockdude]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

While MagicJake is correct...it is a lot of work just for a diagnosis.
(and the odds of breaking something go up dramatically with each removal and replacement)

A simpler solution would be just to swap the imaging units.

Try swapping with the yellow and see if the stripe follows the imaging unit.

Replaceing the led while not technically difficult is not for the novice, lots of plastic to break, and electrical plugs to separate.

[magicaljake]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

While MagicJake is correct...it is a lot of work just for a diagnosis.
(and the odds of breaking something go up dramatically with each removal and replacement)

A simpler solution would be just to swap the imaging units.

Try swapping with the yellow and see if the stripe follows the imaging unit.

Replaceing the led while not technically difficult is not for the novice, lots of plastic to break, and electrical plugs to separate.

He has already replaced the imaging unit with a new one.

[Blizzoo]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

On the Magenta Developing Unit or whatever Xerox is calling it, you should have a clean developing brush without any interruptions if you turn the developing unit drive gears in the correct direction while it is removed.

If there is something between magnetic roller and the levelling blade ( Dr. Blade) you should be able to remove it by inserting a piece of paper between to get it out and spend those 300$ on something else.

[mikewaterloo]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

On the Magenta Developing Unit or whatever Xerox is calling it, you should have a clean developing brush without any interruptions if you turn the developing unit drive gears in the correct direction while it is removed. If there is something between magnetic roller and the levelling blade ( Dr. Blade) you should be able to remove it by inserting a piece of paper between to get it out and spend those 300$ on something else.

Blizzoo - What would the magnetic roller and leveling blade look like? I am not sure what I'm looking for. I would definitely prefer to see if I can fix it since everything else about the machine is pretty clean and works well except this issue that just started last week.Can I see it from the attached image or do I need to disassemble something?

[Blizzoo]

Re: Xerox 7500 DN Phaser - White Streak Issue on Magenta

Blizzoo - What would the magnetic roller and leveling blade look like? I am not sure what I'm looking for. I would definitely prefer to see if I can fix it since everything else about the machine is pretty clean and works well except this issue that just started last week.Can I see it from the attached image or do I need to disassemble something?

In your pick I can see the magnetic roller on the right hand side, is the one covered entirely with Magenta developer/toner. From here the toner is attracted over the drum surface to form the image.

I believe you should disassemble something to get that unit out for inspection/cleaning, you should be able to see if the brush developed is clean or has something stuck under the roller where the Dr. Blade sits.