MX7001N

[gwaddle]

I have an MX7001N which is giving me regular blank areas on the copy. If you remove the DV unit for that color there are spiral patterns on the mag roller with no developer on it. I have replaced the DV units and it fixes it for a few days to a few weeks. Any help with what I'm missing would be appreciated. I am including a scan of what it is giving me. Thanks

[mansart]

Wow the Panda test chart, haven't seen that in a while. If replacing developer unit and dev. fixes problem for a while I would suspect your magenta drum is damaged and causing dev. pull. Check waste toner for developer. Stick magnetic screwdriver in waste toner and see if you have dv in waste toner. If so replace magenta drum.

[OMD-227]

Completely agree with Michael. If dev tank becomes empty or near empty in a short period of time, you have a problem with that drum. Its charging and pulling dev. Your scan is a classic example of what that look like.

[Hemlock]

Concur; there's likely an area of the drum where the organic coating has worn through to the substrate/metal layer & the drum is draining the DV unit of all toner & developer.

[gwaddle]

I shouldn't have to replace the DV unit at the same time should I? Just the developer.

[OMD-227]

The problem is your drum..... not the dev tank. Just replace the dev, perform correct dev adjustments and run it. Make sure firmware is up to date. Unless your dev tank is seized up or has a damaged drive belt or gears, its fine. Dont touch it. Just replace the dev mate.

[DavePo]

I have also seen the discharge lamp on the rear frame get dusted with toner cause developer pull. The best thing to do is take out drums and run TC 5-04 and compare brightness. We had one where the yellow developer was pulling, after several drums developer replacements etc. discovered discharge lamp was dusted with toner. Had to pull pwb out from machine to clean.

[gwaddle]

Mx7001n new development

Today I went to the machine and checked the waste toner, there didn't seem to be any developer in it. I also checked the discharge lamps, they were clean. Swapped magenta and cyan drums and problem went away, I'm sure temporarily. I'm guessing I still need to replace the drum, but I won't have a maintenance kit for a day or two. Any more input would be helpful. Seems to me swapping drums confirms your ideas. Am I right?

[OMD-227]

You'll probably find the faulty drum will start pulling cyan dev now. You should be able to see a clear fault on the drum surface causing the dev pull.
I'm curious how you could go out to machines without basic drum units or drum & MK Kits?? I stock at least 20 of each in my car at all times, as we go through them constantly.

You need to change the drum causing the problem & replace the dev. Run a continuous sim 64-01 or 64-05 as a self test afterwards.

[gwaddle]

Thanks Wazza for confirming what I thought. In answer to your question we didn't have any kits in stock. As we only have 1 of these machines in the field, we carry minimal supplies. Sometimes less than minimal. The good thing is the machine is only about a mile from the shop, or I wouldn't have gone till the supplies came in.

I'll let you know how I come out.

Thanks again for the reply.

[OMD-227]

Sweet mate, anytime.
I understand about your supplies for these machines. Sometimes I get annoyed with our other techs who carry small amounts of parts, then complain to me they cant fix the machine!!!. If you only have one machine, thats fine.... Im sorry dude.

Remember, the color drum unit for all the MX color machines fits into your Venus machine as well. It doesn't say so in any manual, yet it works fine. If you have other MX machines, and you have plenty of the drum UNITS complete, just change the drum unit over. You only need to change the green grid cleaning arm, as it is longer on the C-Dragons & Venus models. Other than that, its all the same. Been doing it for years now. Dont worry about maint kits & drums, get the whole unit, as it is easier, quicker and far less hassle. Its not that much more expensive anyways. It would have paid for itself already anyway.

[glewisme]

I agree with having what you need on hand WAZZA but 20 of each what do drive a cube van????HAHA

[OMD-227]

You can fit 4 MX drum UNITS in the same box, when laid down in different directions. Therefore, you can walk into a job, carrying one drum box, but actually have all 4 drums if needed. 20 drum UNITS = only 5 boxes.

We have Holden Commodore sportwagons down here Sportwagon Range - Vehicles - Holden. Go better. .
Heaps of room. I carry ALOT of stock as I do nothing but color & production machines. Almost 100% first fix rate.

[gwaddle]

This problem came back on the magenta. The drums were all replaced when the problem happened before and it's been good now for about 2 1/2 months. Will this be a peroidic problem or is there something else i can look at as a cause.

[OMD-227]

Did you change just the drum, and not touch the blade, seals & grid?
It is common for a new drum to become worn/damaged quickly if the seals are not cleaned, and the blade/grid unit not replaced. I hope you changed the whole drum unit or at least did a full refurb of the original drum unit. A proper refurb or new drum unit will always last.
There is nothing else to look at that can cause this dev loss issue that hasn't already been covered here. Dev loss from a particular dev unit is always associated with that particular drum unit. Either very worn drum ends or very dirty/corroded mc grid (arching) is the most likely cause. However, check the doc blade within the magenta dev unit to ensure it is perfectly straight, make adjustments as per SM if it looks like more dev is on the mag roller towards one side. Excess dev rotating around the mag roller on one side will definitely wear your drum down and be pulled over toward the drum.