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Check if you have put the little pwb inproperly or, in worst case, you have loose it. This pwb is in the left side of the processor unit. You will see a black circle tape near the grey tape of the grid cleaner.
this is
Controller system error swith of and swith on the printer it will work .If this error occurs again even after the
power switch is turned off and then on
again, please replace
PWB
i dont know what to do
fs-3140 error f040
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