MX6070N - Faded Black

[Kenny]

Hi guys,

got a sharp MX6070N that at first had a issue with the black developing unit.

we have swapped out the black drum/Dv unit now which fixed the issue but now after two months its doing the same thing

now looking at the lifes (attached) the CMY drums are end of life, i presume it could be down to them which is causing the Black DV unit to fade out?

has about 150K

MX6070 SAMPLE.docx MX6070 life.docx

[ron67601]

Looks like your black developer is is being depleted. The diagonal lines give that away. Run T.C. 25-01 and check the black reading. If it is different then the others you need developer and possibly new drum and MK kit.

[jp74msj55]

Might be the middle toner hopper unit not adding toner. Have seen this a few times. Not too terrible to replace especially if you have the RB-10 ??? on it.
Remove that and the plastic assembly for all the drums and developers!!!!

[Kenny]

Looks like your black developer is is being depleted. The diagonal lines give that away. Run T.C. 25-01 and check the black reading. If it is different then the others you need developer and possibly new drum and MK kit.

as i say we did have this issue a few months a go so we replaced the black dev/drum but the issue has returned after 2 months, the units were new from sharp

[danny464]

Sharp also recommends replacing the waste toner when the developer is being depleted but it has usually been the drum unit in our case causing the issue. Did you replace the waste toner in the 2 months since the issue came back?

[Kenny]

From our system it was replaced on the 18th October, we have ordered middle hopper as well as a new DV unit/developer

[ihatefinishers13]

Oh boy... Where to begin... Pull the corresponding drum, if there are wear rings on it, the whole unit needs replaced (NOT just the drum/charge kit). If that looks fine, the discharge lamp could be dirty behind the process unit, the transfer contacts could need cleaned, or it also could be the MC PWB contacts or just the board itself causing it. Oh, it also could be aftermarket toner or waste boxes causing it, too. It's an expensive and fun problem to troubleshoot. SO much fun.

[Kenny]

Hi guys, thankfully the above suggestions worked for that machine!

we do have another machine the same model with the same issue but replaced DRUM UNIT, DEV UNIT, MIDDLE HOPPER, TONER FUNNEL, BOTH HV BOARDS and WASTE TONER but the faded black issue persists
pulling my hair out
any ideas?

[ihatefinishers13]

Hi guys, thankfully the above suggestions worked for that machine!

we do have another machine the same model with the same issue but replaced DRUM UNIT, DEV UNIT, MIDDLE HOPPER, TONER FUNNEL, BOTH HV BOARDS and WASTE TONER but the faded black issue persists
pulling my hair out
any ideas?

At this point, you have replaced mostly everything involved, minus the PCU PWB. Genuine toner?

[ihatefinishers13]

Hi guys, thankfully the above suggestions worked for that machine!

we do have another machine the same model with the same issue but replaced DRUM UNIT, DEV UNIT, MIDDLE HOPPER, TONER FUNNEL, BOTH HV BOARDS and WASTE TONER but the faded black issue persists
pulling my hair out
any ideas?

Also, check the drum again. Sharp has had a bunch of these process units fail because of the seal under the cleaning blade. Still happens to us after replacing them sometimes.