Canon MF6530 Service Manual - Page 140
Power Supply
UPC - 013803056037
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Chapter 9 9.3 Power Supply 9.3.1 Power Supply 9.3.1.1 Outline 0011-5770 When the main power switch (SW1) is turned on, AC power is supplied to the low-voltage power supply circuit in the power supply PCB. The low-voltage power supply circuit supplies +3.3 V, +5 V, and +24 V to operate the machine. +24 V is supplied to the motors, fan, electromagnetic clutch, solenoid, etc. +5 V and +3.3 V are supplied to the DC controller PCB, image processor PCB, anlog processor PCB. There are two types of +24 V voltages: +24 VR which is normaly supplied from the low voltage power supply and +24 VU which is cut off when the left door is opened. The +24VU is supplied to the DC controller PCB and main motor. The +24 VU also plays the role of a door open detection signal (DOPEN). This signal allows the CPU to detect that the left door has opened. T-9-1 Part Name Power supply PCB Main power switch (SW1) Interlock switch (SW2) Function Generates DC power from AC power. Supplies AC power to the power supply PCB. Detects opening/closing of the left door and cuts off +24 VR. P1 Power supply PCB SW1 F1 To NCU PCB +3.3VR +24VR Relay PCB +24VR Clutches +24VR Fan +24VR Solenoids +3.3VR Sensors NF F2 Low-voltage power supply circuit +3.3Vcircuit +5Vcircuit +24Vcircuit ADF ADF motor ADF solenoids ADF sensors +24V +24V +3.3V Reader unit CS unit CS hp sensor Reader motor +24V +3.3V +3.3V +24V +24VR +5VR +3.3VR +3.3V +5V +3.3VR DC controller PCB +5VR +24VR +24VR +24VU +24VU +5VR +3.3VR +24VR +3.3VR +24VR Laser scanner unit Interlock switch (SW2) Main motor Sensors Cassette unit*3 Analog processor PCB +3.3V +5V Image processor PCB +5V +5VS Control panel +3.3V +5V Modem PCB*1 +3.3V +5V +3.3VS +5VS Network PCB*2 Mojular jack PCB*1 NCU PCB*1 F-9-3 *1 : Only if equipped with Fax functions. *2 : Only if equipped with Network functions. *3 : Option 9.3.1.2 Rated Output of the Power Supply PCB T-9-2 0011-5771 Output 24VR Rated output voltage 24V Output voltage tolerance +10%, -5% Rated output current 4.5A Overcurrent protection 7.0A trigger current Overvoltage protection 32.5V trigger voltage 9.3.2 Protection Function 5V 5.1V +3%, -4% 0.3A 4.0A 8.0V 5VR 5.1V +3%, -4% 0.7A 2.0A 8.0V 3.3V 3.4V +3%, -3% 2.4A 3.7A 5.5V 3.3VR 3.4V +3%, -3% 0.8A 2.0A 5.5V 9.3.2.1 Protective Functions 0011-5772 The power supply PCB is equipped with an over-current/over-voltage protection mechanism to prevent damage to the power circuit in the event of an over-current 9-2