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Chapter 2
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2.4.5 Maintenance Cartridge Relay PCB
2.4.5.1 Maintenance cartridge relay PCB components
0013-6972
F-2-29
a) EEPROM (IC1)
The 128-KB EEPROM stores all information written in the EEPROM on the main controller PCB.
2.4.6 Power Supply
2.4.6.1 Power supply block diagram
0013-6974
F-2-30
The power supply converts AC voltages ranging from 100 V to 240 V from the AC inlet to DC voltages for
driving the ICs, motor, and others.
The voltage generator circuits include the +32 V generation circuit for driving motors, fans, and the +5.1V
generator circuit for driving sensors, logic circuits.
When in the power saving mode, the power supply cut outs the +32 V and the +5.1 V.
Power ON/OFF operation is controlled by the main controller PCB. When the upper cover is open, the power
supply cut outs only the +32V power to the carriage.
IC 1
Operation panel
Transformer
DC power supply
control circuit
+5.1V
generation circuit
+32V
generation circuit
POWER ON
Rectifying circuit
Noize filter circuit
AC inlet
100V to 240V
Power supplyMain controller PCB
+5V/+3.3V
generation circuit