My Xerox v180 is not printing any black and I'm wondering how to test to determine the problem. Other colors print fine. Backstory: It was running well but started getting some lines from the black drum so I cleaned the drum and then swapped out the drum with another drum (not new). After swapping the drum, B&W prints were very light. I swapped the drum again and then the B&W print came out blank with no black on the page at all. I opened up the developer area and it was empty. So I filled it with toner but that didn't fix anything. After all this I'm now troubleshooting and I did notice that when I recently removed the drum a bunch of toner fell from the developer lip area. So I suspect the drum is not getting charged to grab the toner, but I know just enough to guess at things. I don't have a service manual, but can check nvm codes if needed. Any help/guidance would be greatly appreciated.
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I just had the same issue, the K developer bias HVPS was the culprit. See thread below.
This is the part you need to replace, on the left side of the machine (the ones on the back are Y and M)
The one on the right is K
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Also you will need new black developer.Comment
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stev0, that fixed it thanks so much for the help and the diagram for the correct part. On a side topic, how do you know you have added enough developer. I added until There were no print issues but was curious if there was a way to measure what was needed.Comment
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Ah, yikes, that's not really the way developer is meant to be used. You may be lucky and it work out ok, but developer is meant to be used in its entirety, poured into an empty (either new or well cleaned out) developer assembly. The amount of developer in the assembly is meant to be precise, so the ATC sensor can adequately judge whether to feed in fresh toner or not.
Using a new (empty) assembly is obviously the easiest method, but if the assembly is otherwise in good shape, there's no reason you can't clean it out and pour in a fresh bag. However, when you clean out the assembly, you have to be very fastidious. It is easy to dump the loose toner out, but there is actually still a TON attracted to the magnetic roller, and if you don't also clean all this out, it would totally mess up the total amount in once you add the new. (Plus, it's all old anyway, and you want it gone.)
I've found the least troublesome way of getting rid of (very nearly) all old material in the assembly is for starters, to dump and vacuum out the auger area. Then, just start turning the mag roller by hand, using the little pegged gear at the end of the mag roller shaft. (It's pretty stiff to turn when there is still a lot of material in there.) Turn both forwards and backwards, vacuuming the developer off the roller until you turn it and no more is there. Then, once you're at that point, tap the assembly pretty good on a flat surface and do it again, because you'll have dislodged more developer and it will show up on the mag roller again.
After that, you're close enough to pour in a full complete bag of developer. Pour about half the bag into the auger area until it is pretty full, then tip the assembly so that much of what you just poured spills over into the "behind the magnetic roller" area. Then manually turn the magnetic roller again like when you were cleaning out, and now most of what you already poured in will be either on the roller or clinging to the back side of it. That'll free up space in the auger area to pour the rest.
By doing that, you'll have the correct, measured amount of developer in the assembly. Like I said, you MAY get lucky and pour in close enough to the right amount, but I would never risk it. It can cause problems that don't show up immediately to be way out of ratio.Comment
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Thanks Caffeine
Is there a danger in adding too much developer? Would the excess just work it's way into the waste?Comment
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If the ratio is off, it can't necessarily fix itself. Like I mentioned, the developer/toner ratio in the assembly is very precisely controlled, which often means if it is too far out of whack, the printer can't deal with it. (Or they wouldn't need to bother maintaining it so precisely in the first place...)
The correct answer is dump it out, clean it, and pour in a fresh batch. Anything else and you are at your own risk. You might be ok, but it is definitely not the right way to do it so you might not. Nobody can give you that answer with certainly.
Good luck.
(If you decide to just wing it, if you get up to several thousand prints, all of which do use that color, and haven't experienced any problems like ruined drums or the metallic developer coming out on your prints or a barber pole streaking effect across the entire page (which are the most likely results of off-ratio material) you're probably in the clear at that point. I'd still absolutely never risk it. Developer is cheap, and the cleaning is just "time".)Comment
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