See above.
It is the toner hopper assembly that is the issue. It is not the dev unit itself!!!!!!!!!
See above.
It is the toner hopper assembly that is the issue. It is not the dev unit itself!!!!!!!!!
I still have never changed one of the cyan. We keep one of each color in stock at the office just in case but its not something we use much.
I did have one yellow do similar to your sample but it hasn't returned since a couple months ago.
Our machines are usually set to do not display on these items. Not sure how many in the field but I know it is got to be a few hundred at least. If I remember I will ask my parts guy how many we have ordered ever.
Just found out we have only order 2 cyans IUs ever. One is still new in our inventory.
Hi Hotfuser. Manic thread .
So far no devs replaced in any of our machines. UK market, Europe. We have even Olivetti and Develop versions of these E-series. Only 1 instance where MF452plus (C454e) had weird black issue with every now and then pages would start coming overtoned, text on page ok and background black as night. All readings were correct all levels correct. So had suspicion of dev or HV or TB. Since I didn't have any of those on hand decided to pull ITB OUT, checked cleaned contacts on belt and inside. Nothing done on HV board. Changed cyan for black drum to eliminate if drum is causing the issue. (Chip swap). Problem persisted.
Last resort to do at that time was to reload/upgrade FW. Problem persisted. Couldn't do much more so ordered new dev. Came back with new bk dev and the problem rectified it self. Couldn't believe it. And it is fine till this day.
So I personally think the issue was firmware.
That is the only thing your machines have in common.
This could be:
a) incorrect upgrade process (jump from mass production to which ever is the latest avoiding version up firmware )
b) Incorrect machine and type selection during firmware upgrade. (Default may change between mass and version up firmware!)
As you said you had to take one machine with KM Tech specialist to factory default and built the firmware versions up and machine is holding OK. Do you recall the full procedure? I think the answer is there.
Wouldn't it be worth to do the same procedure to all of your machines? Time consuming but it may do the trick.
Hope this helps. Have a nice weekend!
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We had a cyan spill developer recently, a C454. It is the first time ever and the machine has been there quite some time and does a lot of colour printing. It is a real estate agent so there is a lot of big blue sky visible in the photos they print so the cyan is getting a work out. We only found out because it soiled the black PH window and the light print on black and white was the cause for the call out.
Well I've still never replaced any dev units on the C284 series & I have around 60 in my patch, visted one last week with 500k still on the original devs, fuser & transfer belt.
Let us eat, drink, and be merry, because tomorrow we may die!
For all your firmware & service manual needs please visit us at:
www.copierfirmware.co.uk - www.printerfirmware.co.uk
Can you post the devs serial nr on the box, if you have some on hand.
Also isnt it easier to save the list output ob USB Stick. That way you can email it to KM.
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