Lexmark W820 - Image Quality Control - the Toner Sensor

1-62 Service Manual
4025-XXX
Toner Sensor
The Toner Sensor is electrically connected to the MCU PWB through the I/O PWB. The
logic on the MCU PWB uses the NO TONER signal to monitor the level of unused toner
inside the EP Cartridge. When the NO TONER signal goes low, the MCU PWB logic waits
for ten additional print cycles to complete, then it generates a 88 Toner low message.
Image Quality Control - The Toner Sensor
The printer uses a Toner Sensor to help maintain consistent print image quality. The
Sensor mounts on the printer frame, under and against the EP Cartridge. The Sensor is
magnetic sensitive and it monitors the level of unused toner inside the EP Cartridge.
When the toner level reaches a specific point, the Sensor notifies the MCU PWB. The
MCU then sends out a 88 Toner Low message.