Panasonic KX-FT901CX-B Service Manual page 117

KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S
8.4.4. 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 is inserted and the start button pressed, pin 17 of IC1 goes to a high level and the transistor Q11 turns on and
pin 129 of IC1 goes to a low level and the transistor Q7 turns on. This applies voltage to the LED array to light it and the voltage
(+3.3V) of CIS turns on. The contact image sensor is driven by each of the FTG-F1 signals output from IC1, and the original image
illuminated by the LED array undergoes photoelectric conversion to output an analog image signal. The analog image signal is
input to the system LSI (IC1) on AIN1 (pin 3 of IC1) and converted into 8-bit data by the A/D converter inside IC1. Then this signal
undergoes digital processing in order to obtain a high-quality image.
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