This is what detects the difference between A4 and A3. But this isn't the problem area.Īt the other end of the scanner bed is one or more sensors that are used to detect the originals length. It is done before closing to get the contrast of the paper against the open platen cover. The reason the lamp comes on is because the machine is using the scanner to look for the width of an original. You can see this as the scanner lamp coming on when the ADF is still raised about 20 degrees. When the ADF is lowered it activates a switch at the back which triggers the scanners original detection. The detected original on the glass was always A3. The problem can be replicated by simply lifting the ADF and closing it without putting an original on the glass. Switching the machine off and on again would allow users to use the copy and scan options if the document feeder was used until the document feeder (ADF) was lifted and an original placed on the glass. This is not the first time I had seen this. However nothing was on the glass to be removed. Today I went to a call for a Bizhub C754e that was constantly complaining that an original had been left on the glass and was not allowing users to copy or scan until it had been removed. So just because the filters are hard to get to doesn't mean that you should ignore them. It seems that the restricted air flow through the filter was causing the imaging unit to overheat during longer prints and then the TCR sensor would start giving higher readings until it failed. I vacuumed it out and the other filters while I was in there and put the machine back together. So I pulled the back off the machine and pulled the filter out and sure enough it was full of dust. The Konica boffins mention that if the ozone filter is blocked it can cause the error. While waiting for the F8 to finish I went and had a look at the Konica tech bulletins for this model and found an interesting bulletin all about this very problem. I went into the service menu and had a look at the TCR sensor values and they seemed normal and then did an F8 just to be sure. Also the error only occurs during longish print runs (50 pages) and if the machine is allowed to sit for a few minutes and turned off and on again it will work fine until another long print run is started. How do I know? Because I changed the developing unit only a month ago. However the machine I am looking at doesn't have any of those things wrong with it. Sometimes the high reading is actually caused by too much toner in the developing unit but usually by old developer mix or a faulty sensor causing a bad reading. But if the level is too high the copier can't easily remove the toner from the developer mix and so an error is generated. The TCR sensor reads how much toner is in the developing unit and allows the machine to control the toner level by adding toner. A C-2557 error on a Konica Minolta copier is caused by the Toner Concentration Ratio (TCR) sensor in the black developer developer unit reading too high. I had a worrying call about a Bizhub 362 that was getting C-2557 errors.
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