H3 is a heater/fuser problem. Try to reset it by SIM 14. Press Clear , auto exposure, Clear and auto exposure and press copy key. check if H3 has been reset and LED is back to "00".
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Popular Solutions for Sharp AL 1631 Grayscale Copier
When I turn my copy machine on, it makes a loud clicking sound. it is a Sharp AL1631 grayscale copy...
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When I turn my copy machine on, it makes a loud clicking sound. it is a Sharp AL1631 grayscale copy machine