EN
Power Supply System
5-7
Toner Cartridge Detection
The Toner Cartridge has a toner sensor. The circuit compares the
output value of the developing AC bias and the output value from the
antenna inside the cartridge, and outputs the toner detection signal.
The CPU detects the remaining toner level and the presence of the
cartridge when the developing bias is applied to the developing
cylinder. The remaining toner level is always detected when the
developing bias is applied. The presence of the cartridge is detected
only when the developing bias is applied during the initial rotation.
Engine Controller Subsystem
The following systems and functions are controlled by the Engine
Controller Board:
z
DC Power Distribution (+3.3V DC, +5V DC, +24VA)
z
Laser and Scanner Drive
z
Paper Motion Monitoring and Control (photosensors and flags)
z
Clutches (tray pickup and Tray 1 feed)
z
Engine Test
z
Motors (Main Drive, Scanner, and Fans)
The operation sequences of this printer are controlled by the CPU of
this circuit. When the power switch of the printer is tuned on and the
printer enters the standby mode, the CPU outputs the signals to drive
the loads such as laser diode, motors, and solenoids, based on the
print commands and the image data input from the external device.
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