My sharp (AR-5316) has appearing a F5 so it can't

F5 is exposure lamp problem, to fix this problem try these solutions:
Solution1: switch off and on the machine.

But if this is not working try solution 2

Solution 2:
Step1: Press continuously Clear key then Interrupt key then Zero key then Interrupt key
Step 2: You are inside the simulation if the display turns off but if not do again step1.
Step 3: Press 14 then press print button
Step 4: If not canceled try step 1 to step 2 again then press 16 then press print button

But if this is not working try solution 3

Solution 3: try to open the platen glass and clean the mirrors and also the bottom side of the platen glass especially the white correction plate then apply solution 2.