General Block Diagram - Panasonic KX-FT21BX Service Manual

KX-FT21LA

2. GENERAL BLOCK DIAGRAM

The control section will be explained as shown in the block diagram.
(1) ASIC (IC1) .................... Composed mainly of an address decoder, modem control section, CPU and RTC.
(2) ROM (IC2) .................... Contains all of the program instructions for unit operations.
(3) Static RAM (IC3) .......... This memory is used mainly for the parameter working storage area.
(4) MODEM ....................... Modem for the FAX.
(5) Read section ................ Contact Image Sensor(CIS) to read transmitting documents.
(6) Thermal Head .............. Contains heating elements for dot matrix image printing.
(7) Motor driver (IC7) ......... Drives the motor and CIS LED.
(8) Reset circuit (IC4) ........ Provides a reset pulse to each of the major ICs.
(9) Analog board ................ Composed of an ITS circuit and NCU circuit.
(10) Sensor section ............. Composed of a document sensor, recording paper sensor, motor
(11) Power supply ............... Supplies +5V and +24V to the unit.
switching board section
(12) CODEC (IC5) ............... A/D and D/A converter.
Controls the general FAX operations.
Controls the operation panel I/F.
Controls the thermal head I/F and CIS I/F.
Executes image processing.
Monitors the H/S volume.
I/O ports
position sensors, read position sensor.
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