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A U2-00 is an internal error code from the main processing board's EEPROM (the chip that stores your configuration choices, the copier's serial number, etc.) It can be a faulty EEPROM but most likely the copier took a power hit/glitch and the fault needs to be reset.
To clear the fault make sure the copier is in Copy mode, then press the 'P' key, then the 'Interrupt' key, then the Clear (C) key, then the 'Interrupt' key. This will enter the machine into simulation mode.
Now enter the number 16 and press start. The machine may also ask you to confirm your choice or you may have an 'execute' key on the LCD screen.
Once the fault has been cleared the machine should reboot. If it doesn't, press the 'CA' (clear all) button and the machine should reboot.
If the U2 code persists, you need to call a repair technician to facilitate repairs.
Sounds like a loose connector. "H" code on Sharps indicate a heater fault, if I remember correctly "2" indicates it's a thermistor. So, if it was working before you took it apart, I'd be looking at the connectors, good luck & happy hunting....
try to cancel it by pressing: #-interrupt-C-interrupt simultaneously, then when the panel goes off input 16 then press the COPY KEY <> The machine will restart automatically. if U2 still remains.. try to replace the mainboard.