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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
okay start by loading a piece of paper on the glass and choosing maual feed and placing a sheet of paper in the manual feed tray and press the start key and see what happens. also on some of the sharp copiers there has been a problem with the print button itself, so i don't know if that may be the case.
E7 codes deal with the optical scanner unit and or the laser unit. It could also be the lamp in the scanner unit. The E7 is the main code. There is a sub code associated with it. To view the sub code hold down the start button. Below is a list of specific codes and their meanings:
E7-02: LSU trouble E7-10: Shading trouble (Black Correction) E7-11: Shading trouble (White Correction) E7-12: Shading Trouble E7-16: Abnormal laser output
If it is a laser (LSU) issue then the LSU may need replacing. If it is a shading error the first step is to remove the platen glass carefully (with the power off because the inverter board). There is a thin white strip on the bottom side of the platen next to the slit glass. Clean this white strip with a soft cloth and a small amout of isopropyl alcohol. Dust on the optics can also cause shading reference errors so gently blow off the mirrors with canned air.
Perform the following key procedure to reset error:
"#" key, Interrupt key, "C" key, Interrupt key
"1" key, "4"key
Start key, "CA" key.
See if unit cycles and comes back up. If not turn off and then back on the main power. If error reappears on site technical service may be required.