+5VA
+5VA
+5VC
FET
FETFET
FET
FET
+3.3VB
+3.3VA
+3.3VH
+24VE
+24VD+24VA
+24VA
+24VB +24VC
+24VBSNS
PWRSW
FREQSNS
AC input
Low-voltage
Power Supply
High-voltage
Power Supply
Fixing
Power Supply
Fuse
FU102
Fuse
FU101
Fixing
Assembly
Fuser Control
Circuit
Frequency
Detection Circuit
+5V
Generation
Circuit
+3.3V
Generation
Circuit
Protection
Circuit
+24V
Generation
Circuit
DCController
Interlock
Switch
SW2
Rectifying
Circuit
Power Switch
SW1
• The low voltage power supply converts the supplied AC power supply to the +24 V, +5 V, and +3.3 V DC power supply
required by the printer.
• The +24V supply consists of +24VA which is always supplied from the low voltage power supply and the +24VB and +24VC
which stop supplying power when the Front Cover is opened.
Protection function
The Low Voltage Power Supply has functions to protect against overcurrent and overvoltage to prevent damage to the Power
Supply PCBs by automatically cutting off output voltage if overcurrent or abnormal voltage occurs due to a trouble.
When no DC voltage is output from the Low Voltage Power Supply Assembly, the protection function is possibly activated.
Therefore, turn OFF the Power Switch, disconnect the Power Supply Cord from the Inlet, and then fix the trouble before connecting
the Power Supply Cord and turning ON the Power Switch again.
The machine has a power supply fuse immediately after the inlet as additional protection functions. If overcurrent occurs in the
AC line, the power supply fuse blows and cuts off the power supply.
2. Technical Explanation (Device)
22
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