Service manual

Chapter 9
9-2
9.3 Power Supply
9.3.1 Power Supply
9.3.1.1 Outline
0011-5770
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
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 V which is normaly supplied from the low voltage power supply and +24 VR which is cut off when the left door is
opened. The +24 VR 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
F-9-3
9.3.1.2 Rated Output of the Power Supply PCB
0011-5771
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
T-9-2
9.3.2 Protection Function
9.3.2.1 Protective Functions
0011-5772
LaserBase MF6530 / / LaserBase MF6540PL / LaserBase MF6550 / KaserBase MF6560PL / / LaserBase MF6580PL
Part Name Function
Power supply PCB Generates DC power from AC power.
Main power switch (SW1) Supplies AC power to the power supply PCB.
Interlock switch (SW2) Detects opening/closing of the left door and cuts off +24 VR.
Output 24V 5V 5VR 3.3V 3.3VR
Rated output voltage 24V 5.1V 5.1V 3.4V 3.4V
Output voltage tolerance +10%, -5% +3%, -4% +3%, -4% +3%, -3% +3%, -3%
Rated output current 4.5A 0.3A 0.7A 2.4A 0.8A
Overcurrent protection
trigger current
7.0A 4.0A 2.0A 3.7A 2.0A
Overvoltage protection
trigger voltage
32.5V 8.0V 8.0V 5.5V 5.5V
Low-voltage power
supply circuit
+3.3Vcircuit
+5Vcircuit
Power supply PCB
+24Vcircuit
Laser
scanner unit
Interlock
switch (SW2)
Main motor
Control panel
NCU PCB*1
Mojular
jack PCB*1
ADF
ADF motor
ADF sensors
Network PCB*2
DC
controller
PCB
Image
processor
PCB
Reader motor
Sensors
Clutches
Fan
Solenoids
Sensors
+5VR
+24VR
+3.3VR
+5V
+3.3V
+5VR
+24VR
Relay PCB
+3.3VR
+24VR
Cassette
unit*3
+3.3VR
+24VR
+24VR
+24VU
+24V
ADF solenoids
+24V
+3.3VR
+3.3V
+5V
+3.3V
+5V
+5VS
+5V
+24V
+5V
+3.3VS
+5VS
*1 : Only if equipped with Fax functions.
*2 : Only if equipped with Network functions.
*3 : Option
CS hp sensor
Analog
processor
PCB
CS unit
+24V
+3.3V
+5V
Reader unit
+3.3VR
+24VR
+24VR
+24VR
Modem
PCB*1
+3.3V
+5V
P1
NF
F2
F1
To NCU PCB
+5VR +24VR +3.3VR
SW1
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