Sharp Fo-2080 ery much like AL series machines (AL-1661CS for example) light at front

[axyun]

Customer called about loud high-pitched sound. When I got there I remove TD cartridge and drum unit and cleaned out drum unit (main charger etc.) Reinstalled units and ran copies which were light on front side for about an inch wide. There was no high pitched sound at this time.
Customer called in afternoon to say copies were much worse as now there was a lot of area that were very light or voided throughout page. I returned next morning with another drum unit and a transfer corona and td cartridge. There was a good deal of developer which had been pulled from front side of machine and was laying on the manual feed cover unit where there charge cleaner felt is stored. It was practically full and some on transfer corona. I cleaned it all out and swapped drum unit and td cartridge and ran copies but still light on front side in same area. Swapped transfer corona and no change.
Considering these facts would the high pitched sound have been high voltage unit or laser unit? Why would the developer be pulled from front side only on 2 drums? Also when I looked at drums there was a thin coating of toner on front side of drum that would be same area of lighter image and rest of drum was clean.
I don't recall seeing this before and was hoping to get some input. Also cartridge that I put in machine was new OEM. Thank you for your help. Frank/ActionPhotocopy

[bilyahn]

Re: Sharp Fo-2080 ery much like AL series machines (AL-1661CS for example) light at f

Not sure if this unit has it but did you check the thin mylar that is attached to the main frame under the drum? Sometimes this will be damaged or just bent and cause some odd issues. Most of the time that I have had a high pitched noise on these it has been the drum cleaning blade.

Good luck.

Bil

[axyun]

Re: Sharp Fo-2080 ery much like AL series machines (AL-1661CS for example) light at f

Thanks Bilyahn. I remember that for future reference. Frank