Back in December of 17, I had a service call on this particular TA2550ci for bad quality. After assessing the needs of the copier I had to order and install a cyan and black developer and drum. the image on it was light in bars similar to when developers start to fail. in addition, there was a lot of cyan developer material in the rear of the copier. when I put the new developers and drums in, the Image became really light and I had a machine error code of C7620. That error states: ID sensor timing error Color registration correction was failed. I looked into the error history and there were over 120 of this error as well as C7601. Obviously thats not a good thing. both point to registration sensors that look at the underside of the belt. So I replaced the sensors. Still no dice. I called kyocera tech support and their answer was engine board. I installed that and the problem was still there. Image was light all the way across, but only for cyan and black. I called my kyocera rep and together we spent a day swapping parts back and forth between a known good machine and a used machine. we swapped High voltage, engine, main, low voltage, we did a full pm onto the copier with no change to the image quality. We ran hundreds of sample pages through the copier and ran dev refresh and drum refresh to try and get the image back. finally I swapped the little board on the left side of the copier that gives charge to the transfer belt. The best I was able to get it was nearly solid pages with little 1-2 inch light bars randomly with skyshots. half tone copies looked fine though u089. I called it case closed and the copier was returned to the customer. just this morning the problem of cyan and black faded lines is back. I printed the error history and now instead of 120 of the error codes, there is now 255 of each. Im just asking on here in case someone else has had this issue. any thoughts or ideas you may have about the issue will be very much apprciated.
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