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RAI
03-18-2016, 11:14 PM
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.

Synthohol
03-18-2016, 11:29 PM
swap coronas yet?

RAI
03-18-2016, 11:49 PM
swap coronas yet?

Hi There,

Yes I had swapped the coronas and had forgot to mention this. It seems to be charge related.

rainmaker
03-19-2016, 01:00 AM
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 one

RAI
03-19-2016, 05:50 AM
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 one

Yes I did. I'll look at the gear mesh but the dev unit I just replaced with a new one. I'm back at it tomorrow. Should there be any new discoveries I'll list.

neil greenhough
03-19-2016, 05:40 PM
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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RAI
03-19-2016, 07:00 PM
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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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.

neil greenhough
03-19-2016, 08:37 PM
Have you checked the K transfer roller?

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neil greenhough
03-19-2016, 09:05 PM
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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RAI
03-19-2016, 09:31 PM
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.

Sent from my Nexus 5 using Tapatalk

I didn't have a k 1st transfer roller with me but it was on my mind to replace it. I will try that tomorrow. I will look at the 255 k as well on the drum at that time. Thanks for you ideas.

rainmaker
03-19-2016, 09:31 PM
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 luck

RAI
03-19-2016, 11:42 PM
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 luck

I'm back in there tomorrow so I will give the dev swap a go. I did do the toner revert. Thanks for the input.

RAI
03-21-2016, 02:53 AM
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. http://uploads.tapatalk-cdn.com/20160321/9b3620527dc26ef51098bb371f79350d.jpg


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MVPunisher
08-25-2017, 12:18 PM
How did you ever make out here>?

methogod
08-28-2017, 05:04 AM
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.

Aliko
12-15-2017, 03:46 PM
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.

Have you solved the problem? I also have the same problem: error code 2824. and the same black die.

MVPunisher
12-15-2017, 06:15 PM
I am still battling this issue on a c1070. Luckily for me it is in our printshop out front of our office. We have 2 C1070s. I have swapped The entire carriage, drums, charges, etc. i swapped the carriage itself. Transfer belt, Color registration assembly, PRCB. No luck, the same machine still codes. It is intermittent but it will code multiple times in a row once it happens. Reseat some things and magically its gone.

I am looking to replace the wiring from the PRCB to the connector that the carriage meets. Not sure what else to do.

methogod
12-16-2017, 09:00 PM
Cut those zip ties 1st...

is the faulty machine near the doors? lower humidity or right under the HVAC vents?


would swap drum motors next...

on the C6501 we had to replace the DV drive unit - at 5million. Not sure where your meter is at on the faulty one....

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