Panasonic KX-FT78RU-B / KX-FT78RU-W Service Manual ▷ View online
5 CIRCUIT OPERATIONS
5.1. CONNECTION DIAGRAM
101
KX-FT78RU-B / KX-FT78RU-W
5.2. 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.
Controls the general FAX operations.
Controls the operation panel I/F.
Controls the thermal head I/F and CIS I/F.
Executes image processing.
TAM monitor and the H/S volume.
I/O ports
2. ROM (IC2)
Contains all of the program instructions for unit operations.
3. Static RAM (IC4)
This memory is used mainly for the parameter working storage area.
4. MODEM (IC5)
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 (IC8)
Drives the motor.
8. Reset circuit (IC3)
Detects voltage at 5V power source, outputs the signal, which provides the reset signal for each IC to IC1.
9. Analog board
Composed of an ITS circuit and NCU circuit.
10. Sensor Section
Composed of a document sensor, recording paper sensor, motor position sensors, read position sensor.
11. Power supply switching board section
Supplies +5V and +24V to the unit.
12. FLASH MEMORY (IC6)
Saves TAM voice data.
102
KX-FT78RU-B / KX-FT78RU-W
5.2.1. GENERAL BLOCK DIAGRAM
103
KX-FT78RU-B / KX-FT78RU-W
5.3. CONTROL SECTION
5.3.1. BLOCK DIAGRAM
A0-17
D0-D7
RD
ROM
4Mbit
A0-14
D0-D7
WR
SRAM
256kbit
RD
RD
WR
TX
RX
TX
RX
H/STX
H/SRX
SP-OUT
TO OPERATION
PANEL
TO ANALOG BOARD
ANALOG PORT
CONTROL
KRXD, KTXD, KLATCH, KSCLK, KSTART
32.256MHz
MODEM
64kbit
SRAM
PRINTER
CONTROL
RTC
TONE
ASIC IC1
VOL
A/D
IMAGE
PROCESSING
MOTOR
I/F
MOTOR
DRIVER
IC8
RESET
IC3
TO MOTOR
T2-T5
256kbit
ROM
OP-PANEL
I/F
OSC
REGULATOR
Tr
+3.3V
+5V
REGULATOR
IC7
MDM +3.3V
24MHz
CPU
+24V
+24V
+5V
XRESETI
XWDERR
D0-7
A0-17
WR
RD
TO CIS
TO
THERMAL HEAD
STB1, 2, 3, THLAT
THCLK, THDAT
ANALOG
SW
Q8
FET
LED ON
CLK, SIG
THON
32.768kHz
Q15
CIS ON
KX- FT78R
U-B/W DIGIT
AL BO
ARD:
BLOCK DIA
GRAM
FLASH
D0-D7
WR
4Mbit
RD
104
KX-FT78RU-B / KX-FT78RU-W
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