General Block Diagram - Panasonic KX-FLB758RU Service Manual

7.2.

GENERAL BLOCK DIAGRAM

The following is an outline of each device IC on the digital board.
1. ASIC (IC604)
Composed mainly of an address decoder and a modem control.
Controls the general FAX operations.
Performs the image processing.
CPU and Real time clock
Provides the reset pulse for each of the major ICs.
2. G/A (IC610)
Controls the operation panel I/F.
Controls the LSU I/F.
Latches lower address.
Controls FANs, LEDs and analog I/F.
3. Flash ROM (IC606)
Contains all of the program instructions on the unit operations.
4. Synchronous Dynamic RAM
4-1. (IC608) This memory is used for the parameter working in the storage area and for the page memory.
4-2. (IC603) This memory is used for image processing.
5. CODEC (IC609)
Performs the modulation and the demodulation for FAX communication.
6. Read Section
CIS image sensor to read transmitted documents.
7. Motor Driver Board
Drives the motor.
8. LSU (Laser Scanning Unit)
Forms the images on the OPC drum by rotating polygon motor and reflecting the laser beam against polygon.
9. Analog Board
Composed of ITS circuit and NCU circuit.
10. Sensor Section
Composed of a cover open switch, a document sensor, a document top sensor, a paper sensor, a paper regist sensor, a paper
exit sensor and a toner sensor.
11. Power Supply Board Switching Section
Supplies +5V and +24V to the unit.
12. High Voltage Power Supply Board
Supplies bias need for the printing operation: bias of the Drum, developing and transcription.
13. Fixing Unit
Composed heat lamp, thermistor and thermal fuse.
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