Panasonic KX-FG2452CX Service Manual page 26

KX-FG2452CX
6.4.4. 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 64 of IC501 goes to a low level and Q601 are turned ON,
pin 110 of IC701 goes to a high level and the transistor Q602 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 ASIC
on AIN1 (pin 3 of IC501) and converted into 8-bit data by the A/D converter inside IC501. Then this signal undergoes digital pro-
cessing in order to obtain a high-quality image.
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