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KM7155
02-15-2012, 07:55 AM
Hi, anyone face this problem before? the machine will show "original on platen" when we put paper on the feeder slide.the problem will gone when we lift the feeder arround 2inch, and closed back the feeder. seems that the machine wrongly detect there are something on the platen glass.

EarthKmTech
02-15-2012, 09:05 AM
Assuming you have consulted the service manual, technical bulletins and performed any relevant adjustments with no luck;


look at where the scanner lamp/mirror assy is parked under the glass when the ADF is lifted. The reading area is the area where the ccd detects the width of an "original" on the glass to assume what size it is, in combination with the optical sensors to the right that detects the length.

the area where the width is detected cannot have deep scratches in the glass or dirt or even dirt on the white reflective pad on the underside of the ADF in that area.

the scanner optics must also be perfectly clean, this includes all of the mirrors. The ccd lenses usually have a dust cover behind the lens that can be removed to inspect if any foreign matter is on the ccd itself, all it takes is 1 speck of dust on that ccd to result in "original left on glass".

failing all that you may have a stuffed/misaligned ccd.

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