My sharp 5520 is blinking toner light without showing f2 and is also printing blank

SOURCE: F2-02 error on Sharp AR-M237

on this code you may have to clean out the developing unit and start with fresh developer. Make sure the developer unit is not leaking from one of the bearings. You may need a tech for this one...

SOURCE: add toner still blinking of sharp AR-5316

the best you can do is to replace the toner cartridge itself. It won't work if you just refill it.

SOURCE: I have a Sharp AR-507. Error F2-00. How to fix?

It could also be the sponge roller in the toner hopper. The old ones started to deteriorate after a while so sharp modified them.

SOURCE: TONER LIGHT STAYS ON WITH NEW TONER CARTRIDGE

Hi,

If the main problem is just the toner light on then what you could do after installing the new toner is resetting the printer. You could do that by powering the printer off, open the front cover (as if you were to replace the toner) with the front cover open and the printer off push and hold the two buttons on the printer and turn the printer on while holding down the buttons then once the bottom light stays on solid, release the two buttons and that should reset the printer.
Now if the toner light is blinking that means that you have reached the 30,000 page mark and the Photoconductor needs to be replaced. If that is not the case you can follow this link to a procedure where it will explain how to reset the Photoconductor. http://bit.ly/91SWS3

SOURCE: Get F2-40 error on sharp ar-5520 Im a newbie in

How are you , this problem occurs when there is very low toner concentration on the unit or low developer.
solution

1. Replace a toner cartridge and make sure it is smoothly running as some come with hardened toner or
2. Replace a new developer which is Sharp Ar 205 dv Check that the toner motor is rotating well