Re[4]: RICOH FT4522 when i turn on tell me E-5

i have a ricoh ft 4522 my problem is when i turn on the machine it always overheats. causing overtemperature code E548. i already replace thermistor 1 and 2 but the problem still occurs. even i only copied 3 sheets . heaters are all good. do you know the solution to my problem? do i need to replace main board or triac/ power supply?
help me...

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