Remaining Toner Level Monitoring - Printronix L5535 Maintenance Manual

Chapter 8
Control System Descriptions

Remaining Toner Level Monitoring

The toner empty sensor's piezoelectric oscillator is embedded in the side of
the developing unit toner hopper. While toner particles are in contact with the
detection surface, this oscillator does not vibrate. However, if nothing is in
contact with the detection surface due to toner level decrease in the hopper,
the oscillator begins to vibrate, causing the printer to sense that the remaining
toner level is too low.
MC-PCBA
Controller board
II–154
Toner low sensor
Control panel
Toner