Ricoh C900s need help, please

[ducphuonghtp]

Hi guys,I have a trouble, our machine run normal until I switch SP5807 from N/A to EU, so error "fusing unit is not set correctly" appear, when I switch SP5807 back to N/A the error disappear but fusing lamps is off, so my machine is not warming up. Please help me.Thank in advance.

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