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AC input
Noise filter
Rectifying
circuit
The low-voltage power supply activates when the AC power is supplied through the fixing power supply by plugging in the AC power cord and turning on the
power switch. The AC power is converted into +24V and +3.3V in the low-voltage power supply to serve the DC power load requirement.
2.7.1.2 Other Function
2.7.1.2.1 Protective function
LBP5050N / LBP5050
The low-voltage power supply has a protective function against overcurrent and overvoltage to prevent failures in the power supply circuit. If there flows an over-
current or overvoltage, the low-voltage system automatically cuts off the output voltage.
If the DC voltage is not being supplied from the low-voltage power supply, turn off the power switch and unplug the AC power cord. Do not turn the power switch
on again until the root cause is found.
In addition, two fuses in the fixing power supply protect against overcurrent. If overcurrent flows into the AC line, the fuses blow and cut off the AC power.
2.7.1.2.2 Power-save mode
LBP5050N / LBP5050
The power-save mode reduces power consumption of the printer.
When the low-voltage power supply receives the POWER SAVE (REM24V) signal from the DC controller, it stops the power supply from the +24V generation
circuit.
2.8 ENGINE CONTROL SYSTEM
2.8.1 DC Controller
2.8.1.1 Outline
LBP5050N / LBP5050
Fuse
FU901
Noise filter
Power switch
SW801
Fuse
FU801
Only for the 200V model
Frequency
detection circuit
+24V
generation
circuit
Protection circuit
Fixing
control circuit
Fixing power supply
+3.3V
generation
circuit
Low-voltage power supply
F-2-20
DC controller
FREQSNS
REM24V
+24V
+3.3V
Chapter 2
0018-6516
0018-6517
0018-6313
2-15
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