1.Under the bottom left corner of the control panel there is a plastic latch that locks scanner assembly for transportation purposes (you can see it if you look underneath; you unlocked that latch when you installed the copier). After a while, due to vibration, that latch moves and deters scanner/lamp free movement. Move it counterclockwise (looking from top). This we usually troubleshoot over the phone.
2. If this doesn't solve the problem, the technician should clean and oil the shaft the scanner assembly rides on (steel bar that runs on the rear side of the copier, left to right, you can see it through the glass).
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The L-6 indicates there is a problem with the "polygon motor". This is the motor inside the laser unit. The laser is not servicable unless it is opened in a "clean room" (no dust particles). If turning the copier off and on does not resolve the issue then the laser needs to be replaced. You could try taking off the back cover of the copier and unplugging and re-connecting any wires you can see connected to any board. sometimes it may just be a wire has worked its way loose.
This works on MOST sharp AL series copiers.
Press these keys in sequence:
Clear → Density select → Clear→ Density select
display should go blank. Then enter:
24 as if you were making 24 copies then press print
then enter 7 as if you were making 7 copies then press print
if successful you should see flashing 000
turn machine off then on again and the drum light should be gone.