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The red light that looks like an empty cylinder on the Sharp AL 1631 Grayscale Copier panel is the "drum replacement required" indicator. The "cartridge replacement" indicator is represented by 6 dots forming a triangular shape.
The drum replacement indicator lights up when there are about 1000 copies left until its end of life. It is only when the indicator starts blinking that the drum really needs replacement.
The part number for the drum is AL-100DR.
I hope this helps.
the problem in your machine is on the drum unit there is a arching on the mc unit.located in the upper portion of the drum unit.if you have an old drum unit try to install it again just for testing.and check if ther is a dumping toner again.
the "screen" is actually called a grid, it is supposed to be on a unnit called the "primary" which sits on top of the drum (long silver unit) it may have a screw holding it. It must have been serviced or someone touched it, does not come off by-itself, anyway, it distributes the charge of the primary to the drum.
So look for a unit that sits directly on top of the drum unit and is the same lenght as the drum
Your unit definetly needs a new drum. The usual yield for this consumable is upt ot 15,000 pages, so at the stated rate, the unit yielded more than average. AL-1000 series share the same toner and drum, so finding remanufactured (or recycled) drum units should be no problem. In Puerto Rico, they are sold for about $79.00.
Several things can cause this problem;
The drum cartridge is not being cleaned properly or there is a problem with the toner cartridge .
Take out the drum cartridge and inspect it for any signs of the defective image.
If that doesnot solve the problem, then Call a tech.