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ricoh 1502... just enter to sp mode (yellow, 1,0,7, push 'c' button 5sec.).... after entering sp mode, switch off & on the machine; if not cleard sc541,,, check thermistors for open/short circuited before going to changing powr supply board 7 finelly BICU (mothr board)
this problem can be solved by pressing the yellow button,then enter 107 and hold down the red button till the screen changes to copy SP,press OK or 1.The macine will now be in service mode.switch the machine off then on again.if it go into SC541 again the problem lies with the thermistor of the fuser unit