Brother FAX-921, MFC-970MC, FAX-931 service manual Power Supply PCB

3.5Power 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

III- 25