Sharp copy machine model AL-1551 keep showing E 7 what should I do to clear it

E7-01 GDI Memory Board error (Graphical User Interface)
E7-03 Laser Output Error. Make sure the Right Side Door is closed securely...try turning machine off and back on to see if the fault will clear.
E7-04 CCD ('Charge Coupled Device' or 'photoelectric converter) white level error
E7-05 CCD black level error
E7-12 CCD shading level error
E7-14 ASIC communication error (try clearing by turning off and on...otherwise Main PWB is bad)
E7-15 Copy Lamp Problem

Common E7 problems and background in copy or send mode usually indicate a bad power supply unit, There are time when sharp has a back -order on this Toner Cartridge(FO-28ND) you can buy a FO-26ND toner. It will work and fit very snug, will get your fax going temporary till you get the FO-28ND The yield on the FO-26ND if use on the FAX FO-2850 will give you less yield, but the objective is to get the fax going till you find the correct toner cartridges.

E-7 error indicates an initialization problem in the optical cavity. The scanners are supposed to move back and forth at start up in order to detect the home pozition. For some reason this is not possible. Remove the exposure glass, unplug the machine (the scanner is connected to power even when the main switch is off) and try to move the scanner assembly see if there are any obstructions and remove if necessary. This error does not need to be reset from simulation mode.

Unplug, wait 5 minutes, plug back in. Could be a boot up problem. Is the machine under warranty. Call a Sharp warranty center and they can tell you what the code is for free. If this has been found helpful, please list as such. May want to go live chat

Unplug the machine from the main ower outlet for some time and then plug it again .power on the machine by keeping the on button pressed for 5 seconds to clear the error.

May in trouble in the software