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Author Topic: Re-built Developer Housing  (Read 384 times)

Midwest Danny

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Re-built Developer Housing
« on: February 05, 2010, 09:18:38 PM »
Hi,
I have this DocUTech that has a re-built developer housing in it ( from J&S ), it has been working great for 2 years and all of a sudden it is putting fine line scratches in the PR belt.
I have changed the developer, cranked it around and it turns great. It is not putting CRAYON marks on the PR belt from grease, but rather very fine scratches in the PR Belt.

Anyone ever had this problem??
Midwest Danny 8-)
« Last Edit: February 05, 2010, 09:20:38 PM by Midwest Danny »
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Dwtn Don

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Re: Re-built Developer Housing
« Reply #1 on: February 05, 2010, 09:31:23 PM »
at any point was there any fuser agent leak ???
The smallest amount will get in dev housing, causing a blockage in the outlet bottom area under the paddle wheel. This will eventually cause a buildup at the rear bearing causing "rocked" toner that will scratch the PR (tiny scratches) once it breaks free from the bearing and floats with the rest of the dev material.

I would yank the dev hsg out, remove rolls. trimmer, and paddle wheel. Inspect etc ... while in there, re-do conductive bearings on the 3 rolls.
The newer style 6180 dev hsgs are great. The improved mag rolls and paddle wheel shaft make things easier.

scratches on PR = Dev or Clnr brush

just some thoughts
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Midwest Danny

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Re: Re-built Developer Housing
« Reply #2 on: February 06, 2010, 01:56:15 PM »
Hi Don,
I don't think this machine ever had a fuser agent leak and I also took the cleaner out and gave it a good once over, nothing in the cleaner that would scratch the PR belt.
It looks like some of the scratches are almost tiny continous lines around the PR belt and some are about 1/2 inch long. A real mystery. Like I said, the lines are very light and less than a very sharp pencil line in width. A lot of them do not show up on the copy.
I really don't think fuser agent in the housing is the problem.
Thanks a million for the reply, all good answers.
UPDATE..........
I put a OLD developer housing  and a new PR belt in and the scratches stopped happening.

Midwest Danny...... 8-)
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rockin57rod

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Re: Re-built Developer Housing
« Reply #3 on: February 07, 2010, 03:12:36 PM »
Did you dump the developer material and run it through a sieve or strainer? My first guess you be that you have chunks of crud in the developer material....how many prints do you have on the unit...I change mine at 10 mill. You may want to pull it apart and clean it out. also make sure the BRD roller clutch is working and the BRD roller is not staying stationary.
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Midwest Danny

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Re: Re-built Developer Housing
« Reply #4 on: February 07, 2010, 10:07:34 PM »
The BRD roller and clutch are great, I have had that happen that the roll does not turn or turns and the roll loads up with developer and scratches belts, but this is not the case.
I changed developer but did not run it through a strainer, I just changed the developer and the scratches happened again with brand new developer, Katun Developer.
I suppose the next step is to take the housing competely apart and look at it inside, there could be junk caught somewhere in there that is scratching PR belts.
Midwest Danny       8-).
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rockin57rod

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Re: Re-built Developer Housing
« Reply #5 on: February 09, 2010, 01:48:28 PM »
Good Idea....a few PR belts back...LOL :roll:
I find that toner builds up in the front mag roller external bearings and creates "cookies" that can cause scratches. I would avoid using non OEM developer and toner, I have found that the machines run overtoned when you use that stuff, and it just creates problems.

Best of luck.
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Midwest Danny

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Re: Re-built Developer Housing
« Reply #6 on: February 09, 2010, 05:42:33 PM »
The "cookies" usually create a "crayoning" effect, meaning a mark like a crayon, sort of at an angle and usually short, less than 10mm long.
These scratches are straight as an arrow in the direction of belt travel and very, very  thin.
Some of the scratches do not even show up on copies.
Midwest Danny 8-)
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rockin57rod

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Re: Re-built Developer Housing
« Reply #7 on: February 09, 2010, 10:11:10 PM »
The only things t hat come in contact with the PB belt are the stock, cleaner brush & blade... and the magnetic brush on the Dev rollers.....I'd say tear down the Dev assembly and clean it...same with the cleaner...and go from there.
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Milo Wilson

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Re: Re-built Developer Housing
« Reply #8 on: February 09, 2010, 10:17:43 PM »
I've seen the cleaner brush pulled out, cleaned and put back in the opposite way it was taken out. This reverses the brush bristles and will leave tiny thin scratch marks all over the belt. Look at the way the fibers lay on the cleaner brush and see if it is reversed.
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Midwest Danny

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Re: Re-built Developer Housing
« Reply #9 on: February 09, 2010, 10:46:56 PM »
Hi Guys,
You missed the UPDATE in the past messages, I put an OLD developer housing in and the scratches stopped. I will tear the housing apart, has to be something in there causing micro scratches.
Midwest Danny 8-)
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brucekva

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Re: Re-built Developer Housing
« Reply #10 on: February 10, 2010, 11:34:52 PM »
leaking bearings, has been my experience. good luck
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Midwest Danny

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Re: Re-built Developer Housing
« Reply #11 on: February 11, 2010, 01:09:52 AM »
Hi BRUCEKVA,
Leaking grease from bearings usually cause the "CRAYONING" effect of short angular marks on the PR Belt.
This is competely diffrent, less than pencil thin scratches on the PR Belt, all in a straight line.
Thanks for the tip, but I don't think this is grease leaking out of a bearing.
Midwest Danny
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exCSER

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Re: Re-built Developer Housing
« Reply #12 on: February 14, 2010, 12:59:59 AM »
Hi Danny,
I've had exactly what you described on a few occasions. It is caused by a contaminant in the developer housing. Sometimes it is the paddlewheel bearings failing and causing heat which fuses the toner into small rocks that scratch the belt. Other times the mag seal at those bearing will break off a chunk and that will cause scratches. I used to change the housing or rebuild it, but I recently found a Xerox approved method of cleaning out the housing called "dump and thump". Remove the developer material, remove the developer housing and turn it every which way while hitting it with a rubber mallet. This will allow you to vac out every bit of the developer and toner in the housing. It's worked for me on 3 different high volume machines. If the bearings don't need to be replaced this should work. Good luck!
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