Read Panasonic KX-FL423RU Service Manual online
16
KX-FL423RU-B / KX-FL423RU-W
6.2.
General Block Diagram
The following is an outline of each device IC on the digital board.
1. SOC (IC101)
This custom IC is used for general FAX operations.
2. ROM (IC102)
This 4MB FLASH ROM contains all of the program instructions on the unit operations.
3. Synchronous Dynamic RAM (IC103)
This SDRAM is used for CPU work and receiving memory and page memory.
4. Read Section
CIS image sensor to read transmitted documents.
5. LSU (Laser Scanning Unit)
Forms the images on the OPC drum by rotating polygon motor and reflecting the laser beam against polygon.
6. Analog Board
Composed of ITS circuit and NCU circuit.
7. Sensor Section
Composed of 3 switches and 4 sensors.
8. Power Supply Board Switching Section
Supplies +5V and +24V to the unit and controls the heat lamp.
9. High Voltage Power Supply Board Section
Supplies bias need for the printing operation: bias of the DRUM, Developing and Transcription.
10. Fixing Unit
Composed heat lamp, thermistor and thermal fuse.
(1) CPU:
This model uses a Z80 equivalent CPU operating at 16MHz.
Many of the peripheral functions are handled by custom designed LSIs.
As a result, the CPU only needs to process the results.
Many of the peripheral functions are handled by custom designed LSIs.
As a result, the CPU only needs to process the results.
(2) RTC:
Real time clock.
(3) DECODER:
Decords the address.
(4) ROM/RAM I/F:
Controls the SELECT signal of ROM or RAM and bank switching.
(5) LSU I/F:
Controls the polygon motor and outputs the VIDEO signal to LSU.
(6) I/O PORT:
I/O Port Interface.
(7) ANALOG UNIT:
Sends beep tones, etc.
Convert the analog signal to the digital signal.
Convert the analog signal to the digital signal.
(8) MOTOR I/F:
Controls the SCAN Motor.
(9) OPERATION PANEL I/F: Serial interface with Operation Panel.
(10) ANALOG GATE ARRAY
(10) ANALOG GATE ARRAY
I/F: Controls the ANA-
LOG GATE ARRAY.
LOG GATE ARRAY.
Controls the ANALOG GATE ARRAY.
(11) MOTOR I/F:
Controls the ENGINE Motor.
(12) FAN I/F:
Controls FAN MOTOR and detect the rotation of FAN MOTOR.
(13) SENSOR I/F:
Controls the LED and detect the sensor signal.
(14) MODEM:
Performs the modulation and the demodulation for FAX communication.
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