Panasonic KX-FP343RU Service Manual ▷ View online
7 CIRCUIT OPERATIONS
7.1. CONNECTION DIAGRAM
117
KX-FP343RU
7.2. GENERAL BLOCK DIAGRAM
The following is an outline of each device IC on the digital board. (Refer to GENERAL BLOCK DIAGRAM(P.119).).
1. ASIC (IC501)
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
2. Flash ROM (IC523)
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 (IC503)
This memory is used mainly for the parameter working in the storage area.
4. MODEM (IC505)
Performs the modulation and the demodulation for FAX communication.
5. Read Section
CIS image sensor to read transmitted documents.
6. Motor Driver (IC508 and IC510)
Drives the transmission motor and the reception motor.
7. Thermal Head
Contains heat-emitting elements for dot matrix image printing.
8. Analog Board
Composed of ITS circuit and NCU circuit.
9. Sensor Section
Composed of a cover open and film detection switch, a document set switch, a document top switch, a paper top sensor.
10. Power Supply Board Switching Section
Supplies +5V and +24V to the unit.
118
KX-FP343RU
7.2.1. GENERAL BLOCK DIAGRAM
119
KX-FP343RU
7.3. CONTROL SECTION
7.3.1. BLOCK DIAGRAM
IC501 ASIC
ADR[15:13]
RBA[5:0]
ADR[12:0]
D[7:0]
DRB[7:0]
DB[7:0]
XRD
XWR
XR
OMCS
XOPRBE
XMDMCS
IC523 FLASH
IC505 MODEM
GA
TE
ARRA
Y
A[17:0]
D[7:0]
XRD
XCS
A[4:0]
D[7:0]
XRD
XWR
XCS
XWDERR
IN
OUT
GND
TO
OP-P
ANEL
KST
AR
T,KLA
TCH
KSCLK,KTXD
KRXD
TO CIS
F1,FTG
VIDEO
TO THRMAL HEAD
TO MO
TO
R
TO MO
TO
R
RM[3:0],RXE
TO PO
WER
SUPPL
Y
+24V
,+5V
,PG,DG
OP-RESET
TM
+24V
+24V
XRESETI
XORESET
XRESET
XBA
C
KEN
RESET
-IC
+3.3V/BA
TT
+2.5V/BA
TT
BA
TT
+
-
24MHz
32.768KHz
TX
RX
TO ANALOG P.
C
.B
A[12:0]
RBA[5:
0]
A[4:0]
+5V
XRAS
XCAS
A[9:0]
D[7:0]
XRD
XWR
XRAS
XCAS
IC503 DRAM
A[7:4]
RBA[5:0]
PT
OP
FILM DETECTION
CO
VER OPEN
SENSOR LED ON
PS501
Sensor P
.C
.B
+3.3V
CN504
CN503
CN505
CN515
CN516
CN506
CN517
SW501
SW502
TX[3:0],TXE
IC508
IC510
MO
TOR DR
V
MO
TOR DRIVE
CISLEDON
IC520
IC520
GA
TE
ARRA
Y
DIR
G
XCAS2
A
B
32.256MHz
+3.3V
VDET
Q505
+3.3V
+2.5V
Q506
+2.5V/BA
TT
+3.3V/BA
TT
XHSTRD
XHSTWR
NEW THD
AT
,
NEW THLA
T,
NEW STB1,NEW STB2
NEW THCLK,
KX-FP343RU
: DIGIT
AL BO
ARD BLOCK DIA
GRAM
120
KX-FP343RU
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