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I have a Sharp SF-7320 copier that produces grainy output. I removed the drum and the developer, blew out the dust and loose toner with an air compressor, made sure the glass, mirror and pickup lens is clean, and installed a brand new drum. The copies come out but there's specks of toner in random places on the page (like static). Is this an electronic or mechanical issue?
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This means the machine is over-toning ie using more toner than required caused by either improper toner or different brand of toner. The correct toner is sf 222T1. Replace developer and use the right toner and clean the drum and its blade. You may need to clean fuser rollers for cleaner copies.
Check the copy lamp and its thermal fuse if they are okay, then clean optics, check drum and blade and clean or replace and finally clean or replace fuser rollers. If the above is ok and still black copies, check the copy lamp wire harness for continuity or the copy control board located underneath the display panel and check for bad component like triac and replace. If OK replace the main control board.
There are several solutions to this problem:
1. Adjust the exposure
2. The drum may be out.
3. The developer may be out.
4. Finally, You may need a PM for the copier. (replace the drum, developer, drum blade)
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