General Block Diagram - Panasonic KX-MB771GR Service Manual

6.2.

GENERAL BLOCK DIAGRAM

MAIN UNIT
SOC (IC300)
This custom IC is used for general MFP operations.
1) CPU
2) SDRAM Controller
3) USB Controller with PHY
4) Scanner I/F
5) LSU I/F
6) MOTOR I/F
7) FAN I/F
8) OPERATION PANEL I/F
9) SENSOR I/F
10) I/O PORT
11) A/D, D/A converter
12) RTC
13) MODEM
14) Analog Front End I/F
ROM (IC402)
This 8MB FLASH ROM contains all of the program instructions on the unit operations.
And support the backup of user setting and FAX receive data.
SYNCHRONOUS DYNAMIC RAM (IC400)
This 256Mbit SDRAM is used for CPU work and receiving memory and page memory.
POWER SUPPLY
DC-DC converters generate 3.3V and 1.2V for system power.
Regurator generates 5V for peripheral devices.
TEL/FAX I/F
Composed of ITS circuit and NCU circuit.
3 ICs called SDAA(Silicon Direct Access Arrangement) control Telephone line, Speaker, and Handset.
READ SECTION
CIS Unit to read transmitted documents.
CIS Unit is connected to FLATBED transit Unit.
Scan data is converted by AFE(IC503).
MOTOR
This model has 1 DC motor and 2 stepping motors.
IC300 drives the DC motor for printing.
IC502 and IC700 drive the stepping motor for Auto Document Feeder motor and CIS carriage.
LSU
Forms the images on the OPC DRUM by rotating polygon motor and reflecting the laser beam against polygon.
SENSORS
Composed of 2 switches and 5 sensors.
POWER SUPPLY BOARD
Supplies +24V and +7V to the Main unit and controls the Heat Lamp.
HIGH VOLTAGE POWER SUPPLY BOARD
Supplies bias need for the printing operation: bias of the DRUM, Developing and Transcription.
FIXING UNIT
Composed heat lamp, thermistor and thermostats.
ARM9 operating at 250MHz.
Controls SDRAM Memory.
Apply to USB2.0 HS
Controls the CIS and AFE, and process the scan images.
Controls the polygon motor and outputs the VIDEO signal to LSU.
Controls the DC motor and Stepping Motor.
Controls FAN MOTOR and detect the rotation of FAN MOTOR.
Serial interface with Operation Panel.
Detects the sensor signal.
I/O Port Interface.
Sends beep tones, etc.
Convert the analog signal to the digital signal.
Real time clock.
Performs the modulation and the demodulation for FAX communication.
Controls the DAA device for TEL/FAX function.
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KX-MB771GR