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5-2 Functional Information
Power Supply System
AC/DC Power Distribution
AC power is supplied to the low-voltage power supply circuit in the
Engine Controller Board when the power switch (SW1) is turned on.
The low-voltage power supply circuit supplies +24 VDC and +3.3
VDC required for the printer.
+24 VDC is supplied to drive the main motor, scanner motor and fan,
and to the high-voltage power supply. +3.3 VDC is used for sensors
and ICs on the engine controller board. +24 VDC is divided into +24
VA which is normally supplied from the low-voltage power circuit, and
+24VB which is interrupted when the door switch (SW101) turns off
by opening the upper cover.
Figure 5-1 Low-voltage Power Supply Circuit
If a short-circuit or other problems on the load side cause an
excessive current flow from the +24VDC, or +3.3 VDC power supplies
or generate abnormal voltage, the excess-current protection system
and excess-voltage protection system automatically shut off the
output voltage to protect the power supplies.
If the protection systems are activated and the power supply circuit
does not output DC voltage, it is necessary to turn the printer off,
correct the problem in the faulty load, then turn the printer on again.
The circuit has two fuses which break the circuit and cut off the output
voltage if excess current flows through the AC line.