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70 Functional overview
EN
Power system (on ECU)
The AC, DC, and high-voltage power supply circuits are all contained
within the ECU.
AC power distribution
The AC power circuitry supplies AC voltage whenever the power cord
is connected to the AC power source. AC voltage is distributed to the
DC power supply circuitry and to the AC driver circuitry, which
controls AC voltage to the fusing assembly's heating element.
DC power distribution
The DC power distribution circuitry, located on the ECU, distributes +5
V DC and +12 V DC as follows:
Overcurrent/overvoltage
There are two overvoltage devices in this printer:
● Fuse F101 provides overcurrent protection for the fixing system
circuitry. To check or replace the fuse requires the removal of the
ECU. Fuse 102 (found only on 110V units) provides overcurrent
protection to the printer DC power supply circuitry.
● In addition, the +12V DC and +5V DC power circuitry contains an
overcurrent protection circuit which automatically shuts off the
output voltage when an overcurrent condition occurs due to a
short or abnormal voltage on the load side.
Table 11. DC power distribution
+5 V DC: Formatter
Photosensors
DC Controller Circuitry
Laser/Beam Detect Circuitry
+12 V DC: Motor
Scanner Motor
Solenoid
+12VA DC: High Voltage Power Supply