Lexmark 11C0200 Service Manual - Page 32

Lexmark 11C0200 - Optra SC 1275 Color Laser Printer Manual

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Toner Cartridge Detection Light from the toner cartridge detection LED (LED2) on the toner empty/toner cartridge detecting board (PWB-B) is reflected by the toner cartridge surface to the photo sensor (PT1). The toner cartridge is detected during warm up. AIDC Sensor and Erase Lamp Automatic Image Density Control (AIDC) The AIDC sensor detects the image density of the AIDC mark formed by toner on the PC Drum to determine proper charging bias and developing bias. The sensor is located on the AIDC/erase lamp board (PWB-C) on top of the image transfer belt. AIDC detection is accomplished with one LED (LED1) and two photo sensors (PT1, PT2). General Information 1-11

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General Information 1-11
Toner Cartridge Detection
Light from the toner cartridge detection LED (LED2) on the toner
empty/toner cartridge detecting board (PWB-B) is reflected by the
toner cartridge surface to the photo sensor (PT1).
The toner cartridge is detected during warm up.
AIDC Sensor and Erase Lamp
Automatic Image Density Control (AIDC)
The AIDC sensor detects the image density of the AIDC mark
formed by toner on the PC Drum to determine proper charging bias
and developing bias. The sensor is located on the AIDC/erase lamp
board (PWB-C) on top of the image transfer belt. AIDC detection is
accomplished with one LED (LED1) and two photo sensors (PT1,
PT2).