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OKI C5100 no print

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Post time: 2013-5-16 14:41:41 |Show all posts
Customer brought this in with a Cyan cartridge explosion, toner everywhere.  They had been printing ok until one of them decided to check if there was still toner in the cart.  Blocked the toner sensor.  I cleaned it all out and printed some test pages from the machine menu.  Noted at that time that the drums were all expired, and three color toners were very low or out.  I got them generic toners from Katun, at the customers request, and none would reset the toner count.  Katun stepped up and tried twice more with new toner carts.  Percent left in cart would not change but printed all tests from machine  menu ok.  Now, one month later, they call and say they have never been able to print anything but machine tests. Nothing from computer.  They got hold of OKI support and were told that they must replace the drums or it can't print from the computer.  Also, of course, told customer that they can't use generic toner.  It was printing before they dumnped the cyan, with generic toner carts, and the drums, I am sure, didn't expire the day I got it.  What gives?

Post time: 2013-5-16 18:08:32 |Show all posts
Thanks for the reply Desert Tech, but I did vacuum the machine thoroughly, and replaced the toner carts.  The customer had been printing, with no problem, with all drums showing that they had expired for some time before he dumped the cyan toner.  I believe that the last time I saw this printer, last june, it was showing that the drums had expired and they were able to print up this repair.  It will still print all internal tests/reports, but not on line.

Post time: 2013-5-16 16:23:09 |Show all posts
The toner spill has dirtied the sensor and it is very difficult to adequately clean without disassembling the cartridge. Always tell an Oki user to NEVER remove the toner cartidge until the unit says to do so. You cannot tell whether an Oki ctg still has toner in it by removing it from the machine. The ctg has a built in waste tank so you cannot tell by weight or feel whether it has toner left or not. Servicing Oki color printers gets a bit tricky. If the drums are expired they must be replaced. There are no generic drums available for Oki that I know of. Each new drum comes with a priming cartridge of toner to maintain an accurate toner % reading when reinstalling a used toner onto a new drum. For example, let's say you have a toner ctg that shows 80% left. You get a message that the drum is at 0%, so you replace the drum. When you install the priming cartridge on the new drum, the toner falls into the drum unit [gravity fed] and the level is kept at the right point so when you reinstall the used toner it will still read 80% left thereabout. If you vacuumed out the drum unit or put in a new drum without the priming ctg, the used toner ctg that was at 80% would now read about 40% when reinstalled because a great deal of toner was used to replenish the level in the drum unit. Make sense? So your customer will need to install new drums and their priming ctgs. Then they can reinstall the Katun ctgs and continue to use them although the amount of toner in them may be significantly reduced by now.
From the book:
Toner LOW is detected by the toner sensor (Reflection sensor) installed inside the printer. The shielding plate is mounted inside the ID and rotates in synchronization with toner agitation.
Moreover, the ID has a shutter fitted. The shutter is synchronized with the operation lever of the toner cartridge, and the toner sensor can detect that the toner cartridge has been loaded properly. Detection may not take place normally, and a toner sensor error may be issued, if the shield plate or toner sensor is stained with toner, or if the ID unit and toner sensor do not remain exactly opposite to each other in their positions.
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