konica minolta c300i yellow drum malfunction

[brent]

kinda crazy of a morning. customer states there is a line on copy. sure enough a yellow drum is scratched it seems so there was a line.. no prob
replaced the yellow drum and now it came up with a p 21 test pattern and a drum unit / dv malfunction. replaced the drum again as sometimes new drums have issues
same code. even ran an initilize stabilization.. wont work. so I gave up and put the old drum back in. copies are still horrible we lost half of the yellow image. right in the middle
am I to keep going and throw a new dv unit in? maybe that was the issue all along. it wont let me do any gradation adjusts with the background malfunction indicator
on. any thoughts on this ? I didnt upload any pics since I am dumb on a regular computer. thanks guys
brent

[brent]

also at 1050.00 I do not have a spare developer unit.. hard to believe they cost that must.. that is dealer cost

thanks brent

[femaster]

Have you tried taking one of the other color drums and swapping it out with the yellow to see if the problem follows the drum or just the color? I'd start there before spending any more money.

[ezzysi]

also at 1050.00 I do not have a spare developer unit.. hard to believe they cost that must.. that is dealer cost

thanks brent

Fit a black unit and drag yellow toner into it with skyshots.. works well on 4 - 8 series

[brent]

ok two things I noticed iwas just there.. customer said the machine was ratcheting.. well he w as right I had to remover the waste toner tank and replace it. cleaned the upper part the tube and the transfer belt was completelly jammed full of toner.. coincidence? or just my holoween lluck. also.. I swapped the yellow drum to magenta. and both 8 and 7 codes popped up drum issues yellow and magenta.. if anyone could decypher what I got my self into here lol thank you

brent

[tsbservice]

I had it once but replaced K drum and belt simultaneously. Problem solved. It was low mileage machine with 30k counter. Do you use brand new OEM drum unit at the beginning of problems?

[brent]

I had it once but replaced K drum and belt simultaneously. Problem solved. It was low mileage machine with 30k counter. Do you use brand new OEM drum unit at the beginning of problems?

all oem all the time. oem toners.. drums everything factory. this has 50k on machine. I guess I had not thought of the belt. that will be next. thank you a ton
brent

[brent]

I had it once but replaced K drum and belt simultaneously. Problem solved. It was low mileage machine with 30k counter. Do you use brand new OEM drum unit at the beginning of problems?

also. did your machine specify a black drum problem? this had a yellow drum code. also the drum had a line on it pretty bad. just was curious thank you

[tsbservice]

I think it doesn't coded just image defects and belt and drum were visible damaged though mine at front end not in the middle.

[SAR]

Sometimes, when those i series transfer belts clog up, you end up with waste toner overflowing and dumping down into print heads and other components. It's always in the area of the yellow drum/ dev unit because the waste toner tube is located directly above the yellow dev unit.

[brent]

I think it doesn't coded just image defects and belt and drum were visible damaged though mine at front end not in the middle.

I think you are right on. the belt was certainly discolored on both sides. not the middle.. the drum had a problem too. and waste toner box. wonder if it was a coincidence.. but the box was pretty full but it did not lock up but backed up.. I caught it luckily thank you sir
brent

[tsbservice]

Sometimes, when those i series transfer belts clog up, you end up with waste toner overflowing and dumping down into print heads and other components. It's always in the area of the yellow drum/ dev unit because the waste toner tube is located directly above the yellow dev unit.

Good call I have seen this on Sparrow but not in A3 models.

[brent]

Sometimes, when those i series transfer belts clog up, you end up with waste toner overflowing and dumping down into print heads and other components. It's always in the area of the yellow drum/ dev unit because the waste toner tube is located directly above the yellow dev unit.

yes right above that. bad design.. lol
brent

[D Colour]

Sounds like you got it fixed, but there is also a known issue with the waste toner conveyance section (above the waste toner). It doesn't open up properly and can cause the backing up of toner into the transfer belt.

[brent]

well I just got back from the copier. sadly the new belt today did not fix the copy quality. same indicator yellow drum dv unit persists. only with today a p 28 code appeared idc sensor rear. its there now. iam running out of ideas. other then dv unit.. they cost so much the cusomer would not be thrilled.. the copies are pretty good well half of the image is.. the back portion of the copy is faded. but not bad. any more thoughts? I have tried to g ive as much info as I could.. I did not make any test copies on the standard test chart either for comparison. I only have katun test charts lol thank everyone for hellping
brent