Question about Sharp AL 1631 Copier
H4 is an indication of a fusing unit heater problem. Most of the time this is a false code caused by power fluctuations or noise.
To reset the H4 condition, press the following key's in sequence and as quickly as possible (with 4 seconds for the first 4 keys)
Press "C" then the far left key (exposure mode) then the "C" key then the far left again.
So in other words C, far left, C, far left
If done correctly the display should go blank.
Now key in 14 as if you were going to make 14 copies.
Now press the print button.
The machine should reset and the code should be gone.
9 times out of 10 this is a false code that pops up due to power surges or noise.
If the code comes back this means you have a heater lamp or thermal fuse (more common) failure in the fusing area and will need service.
Good Luck and Thank You for using Fixya.
Posted on Sep 22, 2010
Follow this procedure to reset; once begun procedure must enter within four seconds; Press "clear", "exposue mode", "clear", "exposure mode" these 4 keys within 4 seconds, then enter 14, then press start, should take care the problem.
Posted on Sep 16, 2010
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Posted on Jan 02, 2017
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