KMBH C432 Solid Colors Quality

[kizi57]

HI ALL,

I'm in East Africa, Tanzania, not a tech guy, i'm KMHB C452 Owner, here there is lack of KMBH Technicians who can fix the MFP to get best quality as it was new one. So i have to use this forum to help myself and to learn how to fix my KMBH C452.
KMBH is gives me this quality poor, see sample printout below (sample copy.jpg) and see sample artwork below of the sample printout (artwork.jpg) while by this time i have change, transfer belt, and color IU's CMY, black IU not yet chaged, i'm still waiting for my technician to come and change that.

One of technicians told me to try replace 2nd transfer roller assembly might work out. Still not sure if it will give me best quality as it was new.. My KMBH has 260'000 impressions. We mostly print 300 gsm matt papers.

I have also attached halftone samples (see halftone-solid.pdf)

Please help.

sample copy.jpg

artwork.jpg

halftone-solid.pdf

[rangertech]

Re: KMBH C432 Solid Colors Quality

can you print test mode ane by one color magenta, cyan, yellow, black, for make sure the problem in one color or all color.

[Logan8]

Re: KMBH C432 Solid Colors Quality

First, do a gradation adjust from the tech mode. Do you know how to do that?
You should be able to tell which color is not producing well from the alignment.

Second, as the other tech suggested, do a CMYK print in the gradation mode in TEST MODE from the Tech Mode area. This will pinpoint the exact IU to replace.

If the problem occurs across the entire spectrum, pull the transfer belt out and check for lint in the back where the cleaning blade is. Clean it.

Make sure the copier is clean by taking out all of the IUs and the Image Belt and dust it off. Clean the Laser windows or the LED arrays.

If cleaning and testing and adjusting don't fix it, you'll have to replace the belt.

That will do it.

[kizi57]

Re: KMBH C432 Solid Colors Quality

Hi Rangertech!Thank you for quick reply!You can find test prints on attached pdf document!

can you print test mode ane by one color magenta, cyan, yellow, black, for make sure the problem in one color or all color.

[Ianizer]

Re: KMBH C432 Solid Colors Quality

First Question

What paper setting are you using, from which tray?

-I

[kizi57]

Re: KMBH C432 Solid Colors Quality

For this one, the paper was 300 gsm matt, and used thick4, bypass tray!When the unit was brand new, the quaality was excellent!Next question please!

First QuestionWhat paper setting are you using, from which tray?-I

[Ianizer]

Re: KMBH C432 Solid Colors Quality

Very good.

Next Question

Have you adjusted Thick Paper Density?

(It also seems as if your laser glasses could use a good swipe with the cleaning rod.)

-I

[kizi57]

Re: KMBH C432 Solid Colors Quality

Thank you for cooperation, I have not adjusted thick paper density, actually i dont know how to do that, maybe i should open my service manual so as i can learn how to do that?

i have attach some test prints (see pdf attached) from old and new IU's, check if might help. Page 1 and 2 of new IU and Page 3&4 of old IU.

Very good.Next QuestionHave you adjusted Thick Paper Density?(It also seems as if your laser glasses could use a good swipe with the cleaning rod.)-I

[kizi57]

Re: KMBH C432 Solid Colors Quality

other colors are OK please find attached PDF of testprint for CYAN. I had old IU looks better than new one. (page 1&2 of new IU the rest of old IU)

can you print test mode ane by one color magenta, cyan, yellow, black, for make sure the problem in one color or all color.

[kizi57]

Re: KMBH C432 Solid Colors Quality

i have found CYAN to be the one which has problem, see attached PDF (page one and two is of new IU, 3 &4 of old IU).

i have replaced all EU's and Tranfer Belt on 15th July, all EU's, exept Black.

First, do a gradation adjust from the tech mode. Do you know how to do that?
You should be able to tell which color is not producing well from the alignment.

Second, as the other tech suggested, do a CMYK print in the gradation mode in TEST MODE from the Tech Mode area. This will pinpoint the exact IU to replace.

If the problem occurs across the entire spectrum, pull the transfer belt out and check for lint in the back where the cleaning blade is. Clean it.

Make sure the copier is clean by taking out all of the IUs and the Image Belt and dust it off. Clean the Laser windows or the LED arrays.

If cleaning and testing and adjusting don't fix it, you'll have to replace the belt.

That will do it.

[Ianizer]

Re: KMBH C432 Solid Colors Quality

Crunching the problem... What are image counts please... If single-click Tabloid, what percentage large paper is run? -I

[kizi57]

Re: KMBH C432 Solid Colors Quality

Thank you for this support you're giving me, i appreciate.

Image counts means no of copies printed? it is around 262,000 copies...

i mostly print A3 size, where i cut my papers in 12 in x18 in size, A3's should be 75%+

there's a friend suggested it might be fuser unit

[Ianizer]

Re: KMBH C432 Solid Colors Quality

Thank you for this support you're giving me, i appreciate.Image counts means no of copies printed? it is around 262,000 copies... i mostly print A3 size, where i cut my papers in 12 in x18 in size, A3's should be 75%+there's a friend suggested it might be fuser unit

Well, I'm going to say something at this point that you will not enjoy, but stay with me... When we say your machine can run 300gsm stock, that assumes a reasonably small percentage of that stock... You have said it is "mostly"... And IF you are set for single-click A3, add half again to that page count, if not double it...In no way am I implying that your machine is "worn out", but you are running it under extreme circumstances. Expect accelerated wear. That said, I still believe a Thick Density adjust will aid with your issue... You may very well be looking at consumables, such as trans belt & roller, fuser, etc.-I

[kizi57]

Re: KMBH C432 Solid Colors Quality

Wow!

That means i should work on setting thick paper density? How does this work then?

Yesterday i saw steps on how to set that, from my service manual book!

Thank you for this advice! Will try this tomorrow early in the morning..!

[kizi57]

Re: KMBH C432 Solid Colors Quality

Can you also re write this on simple language, because i am not that good in english, but i'm trying my level best...

Especially this part "And IF you are set for single-click A3, add half again to that page count, if not double it...In no way am I implying that your machine is "worn out", but you are running it under extreme circumstances. Expect accelerated wear. That said, I still believe a Thick Density adjust will aid with your issue..."

Thanks...
\

Well, I'm going to say something at this point that you will not enjoy, but stay with me... When we say your machine can run 300gsm stock, that assumes a reasonably small percentage of that stock... You have said it is "mostly"... And IF you are set for single-click A3, add half again to that page count, if not double it...In no way am I implying that your machine is "worn out", but you are running it under extreme circumstances. Expect accelerated wear. That said, I still believe a Thick Density adjust will aid with your issue... You may very well be looking at consumables, such as trans belt & roller, fuser, etc.-I