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service manual https://www.manualslib.com/manual/902246/Sharp-Ar-5618.html?page=54
Improper connection of the CCD unit flat cable
Dirt on the mirror, the lens, and the reference
Copy lamp lighting abnormality
CCD unit abnormality
MCU PWB abnormality
(When occurred in the SPF scan position.)
Improper installation of the mirror unit
Clean the mirror, the lens, and the reference
and white plate.
remedy Check lighting and the light quantity of the copy
Check the CCD unit.
Check the MCU PWB
Code E7 has got sub-codes. Go and press copy button to see the sub-code and then report it. Generally, this concerns the laser unit and i would advice you to clean the optical platen glass from interior and screw back well. If a code occurs, then report it for more help.
Push P * C* in quick succession to enter simulation mode. Once there, enter 16 on the keypad. push the print button (like making a copy). Push 1 for yes then print button again. push the CA button. Copier should reboot and run fine for you.
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.