Springs in pressure assembly, pressure contact motor, have any SC569's been logged? Thermistors, thermostats, someone's been messing with the fusing temperature in the past, it could be a few things.
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Up to my nuts in toner and loving it!
After going through every possibilty- it turned ou to be the nv ram believe it or not. Spoke to Wayne in Ricoh and he advised me on this and it worked a treat !