Panasonic KX-FPC135 Service Manual page 165

KX-FPC135 / KX-FPC141
7.4.4. SCANNING BLOCK
The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED
array, and photoelectric conversion elements.
When an original document is inserted and the start button pressed, pin 131 of IC501 goes to a high level and the transistor Q520
turns on.This applies voltage to the LED array to light it. The contact image sensor is driven by each of the FTG-F1 signals output
from IC501, and the original image illuminated by the LED array undergoes photoelectric conversion to output an analog image
signal (SIG). The analog image signal is input to the system LSI on AIN1 (pin 1 of IC501) and converted into 8-bit data by the A/D
converter inside IC501. Then this signal undergoes digital processing in order to obtain a high-quality image.
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