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There are 3 different U2 codes, but all are kinda related. They are all communication related errors to the MCU board. Firstly make sure the developer unit is in securely. You try canceling the error code by going into SIM mode. press the following keys one after the other "#" "interupt" "C" "interupt". enter 14 and press start, this should reset the copier. make sure the copier is restarted. If reset does not work and developer unit is in securely then it would more than likely require a technician. Hope this helps.
Get into service mode by pressing.....
additional functions key (*) key and then...
Scroll down to PRINTER then press OK
Scroll down to PRINTER RESET
then indicate YES(*)
If E000 through E004 is indicated, the RAM on the image processor will
retain the error memory of the fixing assembly after the power switch has
been turned off an then on. Execute the following in service mode, and
turn off and then on the power switch to clear the memory: #7
PRINTER>#4 PRINTER RESET>YES=(*).
Any problems please get back to me
turn on the copier and quickly press * (with the little head around it) then 2 and 8 at the same time, then the * again... this should put you in service mode. now press copier >funtcion>clear>err>ok. now turn the copier off and back on, If the code comes back call your service local service tech.