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13

Power Supply Unit

Operation Panel Board

Digital Board

Analog Board

Document top

Document set

Interface

Board

+24V 
+24V 
+24V

GND 
GND 
GND

+06V

+04V

Thermal

Head

5

4

3

2

1

CN405

RXE

RM3

RM2

RM1

RM0

Motor

7

6

5

4

3

2

1

8

9

10

11

7

6

5

4

3

2

1

8

9

10

11

COM

DATA

STB2

GND

CLO

CK

TM

+3.3V

GND

STB1

LATCH

COM

CN411

CN404

2

1

MPOS

GND

CN408

7

6

5

4

3

2

1

8

9

10

11

CN402

CN403

7

6

5

4

3

2

1

8

9

10

11

+24V

HEADON

LATCH

STB1

+3.3V

TH_TMP

TH_CLK

STB2

TH_DATA

GND

+6V

+4V

CHARGE

RXE

RM3

RM2

RM1

RM0

MPOS

CIS

7

6

5

4

3

2

1

1

2

3

4

5

6

7

V_LED

G_LED

CLK

DATA

+3.3V

GND

SIG

GND

+05V

KSTART

KLATCH

KRXD

KTXD

KSCLOCK

RESET

MIC

2

1

CN5

CN4

CN14

CN918

MIC

MICAG

Sensor Board

2 
1

GND

FILMEND

+24V

DG

+05V

BELL

LINERLY

LINETX

LINE_P

PSHORT

CP

C

MONRX

BBRX

MDMRX

CLIPRLY/HSALC

DCN

BREAK

LINE_M

SP(-)

SP(+)

COVEROPEN

PTOP

REED

CN206

CN19

CN18

CN103

CN104

CN101

CN102

TO TEL LINE

TO EXT. TEL

1

2

4 
3 
2 
1

Sensor Board

4 
3 
2

1

COVEROPEN

PTOP

REED

GND

SP(+) 
SP(-)

7

6

5

4

3

2

1

8

7

6

5

4

3

2

1

8

7

6

5

4

3

2

1

8

9

10

11

12

13

14

15

7

6

5

4

3

2

1

8

9

10

11

12

13

14

15

7 
6 
5 
4 
3 
2 
1

8

7 
6 
5 
4 
3 
2 
1

8

CN409

Sensor Board

7 
6 
5 
4 
3 
2 
1

8

7 
6 
5 
4 
3 
2 
1

8

CN105

SP

Cordless

Handset

CN106

7

6

5

4

3

2

1

8

9

10

7

6

5

4

3

2

1

8

9

10

FILM_CHEK

GND

-5V

AG

CN301

CN1001

SW1001

SW1002

SW1003

SW1004

Charger

Board

3

2

1

3

2

1

+06V

GND

2

1

Charge(+)

Charge(-)

Charge T

e

rm

inal

CN526

CN407

CN527

CHARGE

14

The following is an outline of each device IC on the digital board. (Refer to General Block Diagram (P.15).).

1. ASIC (IC10)

Composed mainly of an address decoder and a modem control.
Controls the general FAX operations.
Controls the operation panel I/F.
Controls the thermal head I/F and CIS I/F.
Performs the image processing.
CPU and Real time clock
Provides the reset pulse for each of the major ICs. 

2. Flash ROM (IC16)

Contains all of the program instructions on the unit operations.
This memory is used mainly for the parameter working in the storage area.

3. Dynamic RAM (IC17)

This memory is used mainly for the parameter working in the storage area.

4. MODEM (IC3)

Performs the modulation and the demodulation for FAX communication.

5. Read Section

CIS image sensor to read transmitted documents.

6. Motor Driver (IC401)

Drives the transmission motor and the reception motor.

7. Thermal Head

Contains heat-emitting elements for dot matrix image printing.

8. BBIC (Base Band IC): IC4

Handling all the audio, signal and data processing needed in a DECT base unit
Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
ADPCM codec filter for speech encoding and speech decoding (DSP section)
Echo-cancellation and Echo-suppression (DSP section)
Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
DTMF receiver (DSP section)
Clock Generation for RF Module
ADC, DAC, timer, and power control circuitry
All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)

9. RF Module: IC28

PLL Oscillator
Detector
Compress/Expander
First/Second Mixer
Amplifier for transmission and reception

10. FLASH MEMORY: IC23

Voice Prompt (TAM) D/L (DownLoad) Area
Programming for BBIC (IC4)

11. EEPROM: IC22

Temporary operating parameters (for RF, etc.)

12. Sensor Section

Composed of a cover open and film end switch, a document set switch, a document top switch, a paper top sensor and a
motor position switch.

13. Power Supply Board Switching Section

Supplies +4V, +6V and +24V to the unit.

15

Charger Board

Tr

+6V

+5V

REG

+6V

Charge Terminal

IC7

ASIC

IC10

32.768KHz

24MHz

+5V

Thermal Head

CIS

RESET

IC13

DRAM

4Mbit

IC17

Motor

Motor Driver 

IC401

PRINTER

CONTROL

A/D

RTC

CPU

256Kbit

ROM

64Kbit

SRAM

MOTOR

I/F

TX

RX

OP-PANEL

I/F

IMAGE

PROCESSING

OSC

32.256MHz

+6V

+24V

Power Supply Board

KEY MATRIX

Document SET

GATE ARRAY

IC301

LCD PANEL 

2 Line

Operation Panel Board

Relay

T101

Digital Board

Analog Board

+24V

+6V

MODEM

BOA

9600bps

IC3

SERIAL

TONE

AUTO ANSWER

+2.5V

SP AMP IC2

Document TOP

Flash

Memory

4Mbit

IC16

RF

IC28

REG

REG

+6V

+5V

ANT

10.368MHz

Dual

Flash

Memory

16Mbit

IC23

EEPROM

32K

IC22

REG

+4V

+4V

I/F Board

+4V

+6V

+4V

+24V

Motor Position

AC

+3.3V

REG

+4V

+3.3V

FET Q401

Film End

Tr

MIC

-5V

REG

+5V

Speaker

T102

P.TOP

REED

COVER OPEN

BBIC

IC4

+5

V

+24V

+5V

-5V

Sensor Board

Sensor Board

KX-FC228UA-T / KX-FC228RU-T : GENERAL BLOCK DIAGRAM

EXT.

LINE

DECT Handset

+

-

IC7

IC8

IC29

Sensor Board

16

This custom IC is used for the general FAX operations.

1. CPU:

This model uses a Z80 equivalent to the CPU operating
at 12 MHz. Most of the peripheral functions are performed
by custom-designed LSIs. Therefore, the CPU only works
for processing the results.

2. RTC:

Real Time Clock

3. DECODER:

Decodes the address.

4. ROM/RAM I/F:

Controls the SELECT signal of ROM or RAM and the
bank switching.

5. CIS I/F:

Controls the document reading.

6. IMAGE DATA RAM:

This memory is programmed into the ASIC and uses 8
KB for the image processing. 

7. THERMAL HEAD I/F:

Transmits the recorded data to the thermal head.

8. MOTOR I/F:

Controls the transmission motor which feeds the docu-
ment.
Controls the receiving motor which feeds the recording
paper.

9. OPERATION PANEL I/F:

Serial interface with Operation Panel.

10. I/O PORT:

I/O Port Interface.

This memory is incorporated into the ASIC (IC10) and used for the image processing.
Fig. A shows the memory map of the Image Data RAM.

This 512KB ROM (FLASH MEMORY) carries a common area of 32KB and bank areas which each have 8KB (BK4~BK63). The
addresses from 0000H to 7FFFH are for the common area and from 8000H to 9FFFH are for the bank areas.

The DRAM serves as CPU and receives memory.
The address is F200H~F3FFH (DRAM access window 1) and F600H~F7FFH (DRAM access window 2).