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The DC controller monitors the FAN ROTATION DETECTION signal (/FANS) to control the
RPM of the fan. The /FANS signal outputs (turn “L”) when the fan rotates at the speed of the
specified RPM: when the DC controller judges the fan normal. The DC controller judges the
fan faulty and sends the error message to the formatter when the /FANS signal has not been
input (turns “H”) for 10 seconds or more.
Low-voltage power supply circuit
The low-voltage power supply circuit converts AC voltage from a power supply receptacle to
DC power and supplies the fuser with the power to drive its heater.
The low-voltage power supply circuit has two components:
● Fuser control circuit: controls the temperature of the fuser.
● Low-voltage power supply circuit: generates the DC power required inside the printer
and supplies the AC power to the fuser control circuit.
Figure 5-11.
Low-voltage power supply circuit
NOTE
The terms fixing and fuser refer to the same operation (or assembly) and are used
interchangeably in this document. Also, ITB unit and transfer unit refer to the same assembly
and are used interchangeably throughout this document.
126 Chapter 5 Theory of operation ENWW