Konica Minolta C308 - Cyan issue

[Gift]

Re: Konica Minolta C308 - Cyan issue

I had a one timer when one of the toner bottles didn't turn so the machine couldn't add toner. Still it should recognize this before there is no toner in the dev mix.

Is the mag roller evenly coated with dev or is there a diagonal/zebra-ish pattern visible?

[Kenny]

Re: Konica Minolta C308 - Cyan issue

Huh! This is wild!
Try Front side board FSB (behind waste toner box) and Power supply board (on the left side).

Is Magnet roller turning cyan if you turn dev unit C manually?
If yes mark the white gears on the back end to check if they are turning.
There should be only one clutch for CMY (at least it is on 4 series), so that shouldn't be the problem, but just in case.

Are you running manual TCR and image stabilization + checking the voltage values after each attemp?

no when i turn it manually there is no cyan there.

and yes i am running that but the table numbers wont budge, i think this machine just hates me

i have now tried replacing the hopper unit, front relay board and the power supply board

[Kenny]

Re: Konica Minolta C308 - Cyan issue

I had a one timer when one of the toner bottles didn't turn so the machine couldn't add toner. Still it should recognize this before there is no toner in the dev mix.

Is the mag roller evenly coated with dev or is there a diagonal/zebra-ish pattern visible?

ive checked and the toner bottles do turn, ive pulled the dev unit out and its all even with black developer

[tsbservice]

Re: Konica Minolta C308 - Cyan issue

Just a wild guess. Maybe it's black developer unit mistaken with Cyan dev. unit
Can you run 50 cyan halftone patterns at 255 density?

[REGSIS]

Re: Konica Minolta C308 - Cyan issue

- i have pulled out the main drive and checked if the air ports where full, they wasn't.

Have you check gears on main drive unit which drive the cyan dev unit?

I don't understand how don't you get toner on magnet roller if you turn it manually and your TCR is 6-7%.
There should be plenty of toner inside.

Toner hopper is ok if that TCR ratio is real.
Front side board could possibly show false TCR ratio and toner is not added anymore.

[Gift]

Re: Konica Minolta C308 - Cyan issue

Just a wild guess. Maybe it's black developer unit mistaken with Cyan dev. unit
Can you run 50 cyan halftone patterns at 255 density?

One should be able to recognize that - actually that's how we convert bk dev units to color

If that's not the case it must be something that prevent the toner to fall into the dev unit. Perhaps some clogging, or faulty shutter mechanism or stucked toner-hopper-auger bushing or whatever. With a parts donator available you might consider to swap the entire toner hopper assembly.

[Kenny]

Re: Konica Minolta C308 - Cyan issue

sample.jpg

this is how the haltone is looking after everything,

i pulled the main drive out the other day and the drive gears were all fine

i tried a hopper unit and relay board from a working machine

[Gift]

Re: Konica Minolta C308 - Cyan issue

[ATTACH=CONFIG]49861[/ATTACH]

this is how the haltone is looking after everything,

i pulled the main drive out the other day and the drive gears were all fine

i tried a hopper unit and relay board from a working machine

So it's looking better, you probably have to force some toner into the dev via SP and check the results after every few attempts (add toner is somewhere under image stabilisation iirc)

[Kenny]

Re: Konica Minolta C308 - Cyan issue

Hi guys,

thanks for your suggestions, Ive even tried a laser unit and still not working, the quality is massively better but still not right.

its loses cyan tone on half the page, i have checked the dev unit again and its still black, the TCR is about 7.0 and there is no P codes on the machine? absolutely baffled

[Gift]

Re: Konica Minolta C308 - Cyan issue

Hi guys,

thanks for your suggestions, Ive even tried a laser unit and still not working, the quality is massively better but still not right.

its loses cyan tone on half the page, i have checked the dev unit again and its still black, the TCR is about 7.0 and there is no P codes on the machine? absolutely baffled

What happen if you put that allegedly "bad" developing unit in a working machine? TCR shouldn't look good if there's no enough toner in the dev mix.

You can also try and dump a little dev amount onto a sheet of paper to see if that is also just "black dev" or maybe looking normally blue-ish (or just rotate the unit for some time by hand(. In this case you might have a mag roller drive issue. I think there are no DV drive clutches for C/M/Y so it seems unlikely but why not checking this out.

[Albonline]

Re: Konica Minolta C308 - Cyan issue

clue here is that supply counts have been reset. hv shift has been reset! copier is overdriving hv unit during calibration. do a initialize all and replace the developers and drums. run image adjustments.