Im working on a mpc 4500 and the orignal problem was that it would not load the yellow toner. The first thing i tryed was changing the toner bottle but that didnt change anything, the machine would just bring up the loading toner screen try to load then go back the the intail load toner screen. I then found out for support that a ram clear fixes this problem 90% of the time, so i preformed a ram all clear and it seemed to work for a while. In the time that it was working it breifly siad that the was no magenta toner when the bottle was full, it tried to load and wouldnt so i power cylced the machine and it seemed ok. The next morning customer rang and said the yellow was playing up again. i ordered a yellow pump and a IOB board. I replaced the pump, blew the hose out, tested the toner out sensors and replaced the IOB board and the machine seemed ok for about 20 prints. It now says there is no black toner and will not load the toner. Any ideas would help!
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