MX-M354N Undertoning

[faxman28]

Re: MX-M354N Undertoning

It was at about 110.

is 110 after new dev and 25-2 or when copies get light. 110 value should have more toner in dev unit from default 128 value. the toner value below 128(or reference value from 25-2) has more toner and the value above 128 (or reference value) has less toner in dev unit.

[Buddy]

Re: MX-M354N Undertoning

Yes, that's after a DV change.

[Jhonjon]

Re: MX-M354N Undertoning

Did you replace the Developer? if yes, after the calibration you said the value is 110 it is in range it must copy well after the DV replacement...Did the undertone comes after a couple of hundred or thousands of copies? if yes try to check the toner itself maybe it is not dropping a toner properly thou the clutch is rotating or try to test also a good DV unit...

[Buddy]

Re: MX-M354N Undertoning

I should have completed this thread a long time ago. The problem turned out to be the toner clutch.

NOW, I have another one with the same issue - undertoning. I'll change the developer and it will run just fine for 3 to 6 weeks. Then out of the blue, undertone.

I have tried a new toner clutch. I'm thinking a new drum/charger unit and a toner sensor?

It's throwing a F2-40 code as well.

[onetek]

Re: MX-M354N Undertoning

I've had a couple throwing me that F2-40 code. It was worn out rear mag bearing...(replaced under waranty).

Th.

[MarkyB]

Re: MX-M354N Undertoning

Thanks guys. Readings are all good (once I replace the developer). I ran 10-1 several times and it didn't tone up very much, but I did verify that the clutch was turning. If I can get a hold of it, I'll look into the tech bulletin. Thanks again.

Have you checked to see if the DR. Blade is correctly set ? Or another DV unit in the good machine to troubleshoot ?

[Buddy]

Re: MX-M354N Undertoning

Replaced the developer unit. (Had 200K on it.) Seems to be good.

Thanks guys!

[boutn]

Re: MX-M354N Undertoning

there is bulletin about toner clutch sticking and causing overtone, since clutch is faulty could also cause undertoning, also calibration needs to be done , like on color mfps. Also there is drum patch sensor in transfer unit that reads density patches on drum.

Does anybody have this techical bulletin about the toner clutch?


Cant find anything on the european sharp site...