Panasonic KX-FB423CN, Manual

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7.2. GENERAL BLOCK DIAGRAM
The following is an outline of each device IC on the digital board.
1. ASIC (IC501)
Composed mainly of an address decoder and a modem control.
Controls the general FAX operations.
Performs the image processing.
CPU and Real time clock
Controls the operation panel I/F.
Controls analog I/F.
2. Flash ROM (IC523)
Contains all of the program instructions on the unit operations.
3. Dynamic RAM (IC503)
4. Read Section
CIS image sensor to read transmitted documents.
5. Motor Driver Section
Drives the printing motor.
6. Analog Board
Composed of ITS circuit, NCU circuit and contains driving ADF Motor unit.
7. Sensor Section
Composed of a cover open switch, document set sensor, a document top sensor and CIS position sensor.
8. Power Supply Board Switching Section
Su5V and +24V to the unit.
9. Film detection Unit
Detect whether the film is made by panasonic and inform left amount of ink film.
10. Thermal Head
Contains heat emitting elements for dot matrix image printing.
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