Panasonic KX-FP343UA Service Manual ▷ View online
7 CIRCUIT OPERATIONS
7.1. CONNECTION DIAGRAM
117
KX-FP343UA
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-FP343UA
7.
2.
1.
GENERA
L
B
B
LOCK
DI
A
A
G
RA
M
119
KX
-F
P
343
UA
7.3. CONT
ROL
S
E
C
T
ION
7.
3.
1.
BLOCK
D
IA
GRA
M
IC501
ASIC
ADR[15:13]
RBA[5:0]
ADR[12:0]
D[7:0]
DRB[7:0]
DB[7:0]
XRD
XWR
XROMCS
XOPRBE
XMDMCS
IC523
FLASH
FLASH
IC505
MODEM
MODEM
GATE
ARRAY
A[17:0]
D[7:0]
XRD
XCS
A[4:0]
D[7:0]
XRD
XWR
XCS
XWDERR
IN
OUT
GND
TO
OP-PANEL
KSTART,KLATCH
KSCLK,KTXD
KSCLK,KTXD
KRXD
TO
CIS
CIS
F1,FTG
VIDEO
TO
THRMAL
HEAD
THRMAL
HEAD
TO
MOTOR
MOTOR
TO
MOTOR
MOTOR
RM[3:0],RXE
TO
POWER
SUPPLY
POWER
SUPPLY
+24V,+5V,PG,DG
OP-RESET
TM
+24V
+24V
XRESETI
XORESET
XRESET
XBACKEN
RESET-IC
+3.3V/BATT
+2.5V/BATT
BATT
+
-
24MHz
32.768KHz
TX
RX
TO
ANALOG
P.C.B
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]
PTOP
FILM DETECTION
COVER 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
MOTOR DRV
MOTOR DRIVE
CISLEDON
IC520
IC520
GATE
ARRAY
DIR
G
XCAS2
A
B
32.256MHz
+3.3V
VDET
Q505
+3.3V
+2.5V
Q506
+2.5V/BATT
+3.3V/BATT
XHSTRD
XHSTWR
NEW THDAT,
NEW THLAT,
NEW STB1,NEW STB2
NEW THCLK,
KX-FP343UA : DIGITAL BOARD BLOCK DIAGRAM
120
KX
-F
P
343
UA
Click on the first or last page to see other KX-FP343UA service manuals if exist.