Good Day. Looking for some help. I have a C6000 that had a worn K drum. Upon replacing it and doing the calibration I got a grey copy with back ground. I replaced the back developer mix and went to calibrate. Machine through a C-2824 upon auto gradation auto adjust. I looked and cleaned the gamma sensor, changed the developer unit, chargers. In test mode I can get a light grey output on test sheet 53 at 200. At 70 the sheet is blank with a slight roughness on the sheet like a dev leak without the mess. As well I stop the machine in test mode and verify all colours are being layed down on the drums. But the black is very light. Any ideas or help well appreciated. Thank you.
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Re: C-2824 KMC6000
swap coronas yet?We know a thing or two because we've seen a thing or two.
The medication helps though... -
Re: C-2824 KMC6000
I assume that you have done dv replacement before and did toner density sensor adj after dv charge.I would try dv revert on the k dv unit .If that doesn't work either replace the dv sensor or the unit.and re cali.good luck.also I would check the dv gear to make sure they all turn,you might have one the doesn't mesh with other oneComment
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Re: C-2824 KMC6000
Try swapping the dev unit position with another unit and then check to see if the problem moves with the dev unit. This way you can get closer to diagnosing whether it is charge or dev unit related. How many prints has the unit produced?
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Re: C-2824 KMC6000
Hmmm aren't the C6000/c7000 units unique? I know the cyan is a different part number opposed to yellow or magenta. As this is the k unit is it possible to move it in place of a colour and tape the toner holes closed? This is a new dev unit k, k drum, charger, k dev material. It happened after the first drum started leaving a back ground. I replaced the drum and code was thrown. I replaced the drum again and the code remained. Then I replaced chargers, dev and material. I cleaned idc. Darn thing will give me a toner density check no problem. Test sheet 53 at 70 for all colours is great. K comes out blank. It I drive the density to 200 I get a grey output.
Is it possible to have a damaged print control board that just affects k? I'm looking for the obvious. Usually that's the answer. Faulty dc voltage to the k dev unit? Any clues what values I should be checking for? I'll attach the a picture of the belt after if through a code to see if anyone can see something I'm missing.Comment
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Re: C-2824 KMC6000
Have you checked the K transfer roller?
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Re: C-2824 KMC6000
Also you could try printing a K 255 pattern then stop machine before paper exits and check the drum to see if the density is correct.
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Re: C-2824 KMC6000
did you do toner revert?I would swap the k dv unit with the yellow dv unit.Put tape over the dv slot where the toner goes in.and run it again .see if the error code changes.if it does you have a bad dv unit.good luckComment
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Re: C-2824 KMC6000
Well back to the drawing board. Swapped out the dev unit, same result. Changed 1st primary same result. Stopped machine mid test sheet (53) at 255 k only. Image light. Density on the tcr was in spec at 130. I'll get new dev mix tomorrow and try again. It can't be any of the hv's units as every other colour is fine. This is completely odd. See printouts with every new.
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Re: C-2824 KMC6000
How did you ever make out here>?Comment
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Re: C-2824 KMC6000
I have two C6501s and have had this before with a weak drum, not sure what caused it but swapping drums, yellow and black usually get me though to the next cycle.Comment
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