EdgeStar BR1000SS - 10 Circuit Description; Power Pcb

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10. Circuit description
10.1 Power PCB
 AC input voltage is lowered by the transformer, then filtered by rectifier diode & LC into DC 12V.
 The DC 12V controls the switches of compressor and defroster.
 DC12V is changed through adjuster 7805 in to stable DC5V.
 DC5V provides the power to the control chip.
 The control chip monitors the temperature changes in the refrigerator.
 If no power is detected in test, first check whether there is input voltage between the L& N line of
main PCB, if no input voltage(115V), check whether there is power supplied from the socket.
 If there is input voltage, put the black probe of multi meter on the bottom of “GND” pin, and put
the red probe on the bottom of “+5v” or “+12v” pins. If “12v” or “5v” is detected, check whether
there is a loose wiring connection.
 If there is no “12v” or “5v” it means the main PCB is defective. Replace it with a new one.