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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.
Generally F codes have to do with the finisher(used to be called a sorter). with the machine off, diconnect the finisher cord from the copier and power back on. This should allow you to test the copier. I'm not sure on this model how exactly the finisher cord comes out. but it should be self explanitory when you see it.
H3-XX codes involve the fusing unit temperature being too low or too high.
Try resetting the error.
[C] – [INTERRUPT] –  – [INTERRUPT]
Type in 1 4
Turn power off then on if it doesn't do it automatically.
If error doesn't reset then you have other trouble
I hope you ran the developer setup and reset all of the parts counters for the items you replaced. Not setting the developer reference can cause a host of problems.
Sim 25-02 adjusts developer. Sim 42 clears DV counter