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3.5 Power Supply PCB
The power supply uses the switching regulator to generate DC power (+25V, +6.5V, and +5V) from
a commercial AC power line.
The +25V source is stabilized and fed to the motor and solenoid (for feeding documents, recording
paper, and ink ribbon), recording head, the main PCB, and the CIS LED array.
The +6.5V source is not stabilized and fed to the Ni-MH battery (on the FAX870MC/FAX-930/FAX-
931/MFC970MC). The +5V source is fed to the logic on the main PCB, control panel, recording
head, and sensors.
Power Supply Circuit