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Ok I found the problem. these shameful for me but I decide to share it anyway. I live in apartment that didn't have earth ground in receptacle. Small electrical shock reallly bother me. althought it also destroy some sensitive component mosfet. (current flow through capacitor in switch mode power supply) Then one day I decide to get rid of these. I hammer ...


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Sounds like a power saver issue. Make sure things like your USB ports, hard drive, or anything you need the printer program to access doesn't turn off in power save.


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