Re: My coloured copy machine sharp mx 2300n is showing...
E7-20 is problem with laser unit - Black. Check connectors, optical axis of laser beam (in case there were assembly / disassembly actions). Laser unit can be defective.
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The U2 errors are usually related to memory or board level issues. You should try to disconnect the fax and network and then kill the main power inside the cover. Turn the main power on and then when you get a solid green light on the control panel press that power switch. If the machine boots with everything disconected then try conecting the options one at a time and try rebooting each time to see if you can narrow down the problem.
That code is Toner supply adnormality error, there is a pipe in the back of the machine that gets clogged sometimes. Or the gear that drives the tone is broke. Either problem would be better handled by a trained tech. There is no easy fix.
Ensure you are in COPY mode
press # * C * ( one after the other, fairly quickly)
when the screen changes enter the number 14 on the keypad
press the B&W start button
press 1 for Yes when the question displays
press thw CA button
machine will re-boot and fault should clear. If it doesnt you need a service engineer. This is a fuser temperature fault
VK means black developer has reached end of life. You can safly carry on using the copier with this message displayed but over time the copy quality may slowly degrade. You will need to call a Sharp authorized dealer to replace the developer in the developer unit.
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