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C0520 means Fuser overheating. You have to reset the machine first by hitting a tiny reset switch on the main board. When you know where the switch is located you can reach him from the front if the machine is swung open but the first time I'll think you need to remove the upper back cover for orientation. The switch is located at the lower right corner of the main PWB-A.
I cannot seem to find the board with the reset button on it. Can someone please elaborate a little further on how to gain access to the board, with the reset switch? thank you
Open the clamshell, look at the back of the machine , the main board is behind the upper rear cover. The switch is clearly shown in one of Hansoons pictures in the post from 2008. I suggest that you clean the fuser thermistor or most likely the code will come back! If you are not a Tech be very careful what you touch at the back of the machine!!
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