Tip & How-To about Konica Minolta magicolor 2500W Laser Printer

Konica Minolta wont start keeps stating cartridges need changing

The Konica Minolta 2500W is probably very similar to many others of the series, so heres a tip I found out the hard way: Firstly If one does',t have access to the manufacturers schematic one can only use ones visual and sensual skills to fault find a problem, and many times one misses an obvious fault by not knowing where the fault is hiding. And so it was with me and so I pass this on to help others and maybe save a bit of cash!Having used the printer for thousands of good prints, the printer started playing up and saying one or other of the toner cartridges were not empty but missing and telling me to put a cartridge in. Also it was not always the same colour cartridge. Sometimes after two or three lid openings and closings the printer would decide all was OK and carry on working. This problem gradually got worse and I cured it for several hundred more prints by thoroughly vacuum cleaning the printer innards. Then the problem started again, and this time it would report a cartridge was missing after a paper jam or missfeed, that really made my mind boggle! After checking all I could see and even stripping and cleaning the cartridge evaluater switch (to be found bottom right behind the cartridge carrier), things didn,t get better, in fact the machine refused to do anything except rotate the cartridges and tell me to place a cartridge in the holder, of course all the cartridges were there! After spending a great deal of time trying to de-bug the thing I looked up a new printer and decided to buy it. Incidentally I ordered the same model as the one I already had, as when this one was working it had done a lot of work, i having bought it second hand cheaply and re- filled the toner complete with new chips it functioned great, hence the new one would have a few spare parts in hand if needed. So in a better state of mind knowing that a brand new printer was coming, I set about stripping the old one down, removed all the side and rear panels, disconnected most of the cables and removed most of the obvious screws, removed several of the drive motors and then started taking some of the other bits and pieces away, Guess what! On the right hand side of the printer alongside the right hand side face of the drum that carries the cartridges, was a small black housing retained by a couple of screws. I removed this and "Murphies Law" the little housing held a photocell position sensor that told the printer controller if the the cartridge carrier was in position (there was no way that one could see this unit from within the machine) , and wait for it -- the cell unit was filed with toner dust and could not have detected anything in that condition. At this point in my stripping down of the printer there was no way I was going to start re-building it again, so I just told myself what a fool I was that I had not found that cell before and carried on stripping down the what would have still been a working printer. So a couple of morals to this story.1 Most of the troubles with laser printers (other than consumables running out), are caused by toner dust getting in places where it should not.2 If you don,t have a manufacturers schematic then you must look twice as hard at every possible place that a sensor could be hiding.3 remember that "Murphie" has prepared it for you.So, joking aside, it pays to have a good look behind small housings etc that probably contain sensors of some sort (not in the laser unit!).

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