A day ago I cleaned Thermistors and continuity tested heat lamps and 4 thermostats. Cleared sc544 code in diagnostics, it ran until today. Now am getting sc544 then 3 or 4 seconds later sc990. SC Code Reset does'nt help just happens again. Was going to replace Thermistors (3 day wait). How do I test them? Other suggestions for sc990 was to update firmware. How? Is this going in the wrong direction or is there a simpler solution? Nothing like this in copier history.
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Just change the thermisters no need to test them. also if there is toner built up on the heat roller lower the fuser temp a few degrees to around 160. -
The 990 can be related to the HD if equipped or firmware reflash but mostly it may need a new PCU. The PCU is rated at 60K but rarely makes it that far. Just take a look at the drum.sigpic
You never realize how cheap a professional is until after you let an amateur do it.
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Go for the thermistors id say most likely,after that swap out fuser for testing if you have a spare you can use.Comment
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The 990 is probably a result of the 544 codes. The thermistors are an quick and easy fix. Check the cleaning roller, hot roller, and hot roller bearings, it could be time for a fuser PM.Comment
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just change the thermistors, sc990 may it controller board(interface) or the drum
i have sc990 on aficio 2045e i have changed the drum and it workComment
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