DOWNLOAD Panasonic KX-FT57E Service Manual ↓ Size: 3.76 MB | Pages: 127 in PDF or view online for FREE

Model
KX-FT57E
Pages
127
Size
3.76 MB
Type
PDF
Document
Service Manual
Brand
Device
Fax / THERMAL PAPER
File
kx-ft57e.pdf
Date
PREV: Panasonic KX-FT502RU-B / KX-FT502RU-W / KX-FT504RU-B / KX-FT504RU-W (serv.man4) Service Manual / Supplement

Panasonic KX-FT57E Service Manual ▷ View online

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118
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KX-FT57E
CIRCUIT OPERATIONS
Page
1. Connection Diagram ........................................................................ 119
2. General Block Diagram ........................................................... 120, 121
3. Control Section ........................................................................ 122~127
3-1. Block Diagram ................................................................... 123
3-2. Reset Circuit ..................................................................... 124
3-3. SRAM and RTC Back Up Circuit ...................................... 125
3-4. Supervision circuit for the Thermal Head Temperature .... 126
3-5. LED Array ......................................................................... 127
4. Facsimile Section .................................................................... 127~135
4-1. Image Data Flow during Facsimile Operation ........... 127, 128
4-2. Thermal Head ........................................................... 129, 130
4-3. Read Section .................................................................... 131
4-4. Stepping Motor Drive Circuit ............................................. 132
4-5. Sensors and Switches .............................................. 133~135
5. Digital Speaker Phone Circuit ......................................................... 136
6. MODEM Section ...................................................................... 137~143
6-1. Function .................................................................... 137~142
6-2. MODEM Circuit Operation ................................................ 143
7. Explanation of Analog Section Block Diagram ........................ 144, 145
8. NCU Section ............................................................................ 146~149
9. Analog Gate Array ................................................................... 150, 151
10. Operation Panel ............................................................................ 152
11. LCD COG Type ............................................................................. 153
12. Power Supply Board Switching Section ................................ 154~156
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119
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KX-FT57E
1. CONNECTION DIAGRAM
HSMIC+
HSSP-
HSSP+
HSMIC-
MIC
SPEAKER
+5VA
+5VD
DG
PG
AG
THPOWER
CN1
TO TELLINE
HAND
   SET
 
POWER
   SUPPLY
      BOARD
+5V
GND
GND
GND
+24V
+24V
SP-
SP+
MIC+
MIC-
THERMAL
     HEAD
 
STB4
STB3
STB2
STB1
THER+
THER-
THDAT
THLAT
THCLK
+5V
GND
GND
GND
+24V
+24V
STB1
STB2
STB3
STB4
THCLK
THLAT
THDAT
A
B
NA
NB
COM
RX  
MOTOR
TX  
MOTOR
AIN
DG
FTG
FR
F2
F1
+5VD
DG
CCD
BOARD
+24V
LED
LED ARRAY
RESET
KRXD
KTXD
KSCLK
KLATCH
KSTART
DG
+5V
JOG1
JOG2
NC
FG
RS
R/W
E
D4
D5
D6
D7
VSS
VDD
VO
LCD
(COG)
OPERATION
BOARD
DIGITAL
BOARD
ANALOG BOARD
A
B
NA
NB
COM
1
2
1
2
3
4
5
6
7
8
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
6
7
8
9
10
11
12
11
12
1
2
3
4
5
6
7
8
9
CN1
RESV
CPC
CSI
CCLK
CBUSY1
CBUSY2
CSO
1
2
3
4
5
6
7
CN3
CN7
CN6
CN10
CN9
CN5
CN11
CUTPOS
1
2
CN8
SENSOR
GND
THPON
+24V
GND1
GND2
GND3
+5V
VRX
VTX
RX
TX
TONE1
1
2
3
4
5
6
7
8
9
10
11
1
2
3
4
5
6
7
8
9
10
11
T2/BEL
/WR
/RD
/CS
D0
D1
D2
D3
D4
A0
RESET
1
2
3
4
5
6
7
8
9
10
11
CN2
1
2
3
4
5
6
7
8
9
10
11
CN7
CN9
CN8
M24V
P13
1
2
1
2
2
3
4
5
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
CN6
CN5
CN4
CN3
THER+
THER-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
3
4
5
6
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
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120
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KX-FT57E
2. GENERAL BLOCK DIAGRAM
The control section will be explained as shown in the block diagram.
(1)
ASIC (IC1) .................... Composed mainly of the 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 CCD I/F.
..................................... Executes image processing.
(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)
Flash memory (IC4) ..... This memory is used for the voice prompt and TAM.
(5)
MODEM (IC5) .............. Executes modulation and demodulation for FAX and Digital SP-Phone communications.
(6)
CODEC (IC6) ............... Executes coding and decoding for Digital SP-Phone communications.
(7)
Read section ................ Composed of the LED array light source and CCD image sensor to read transmitting
..................................... documents.
(8)
Thermal Head .............. Contains the heating elements for dot matrix image printing.
(9)
Motor driver (IC7, IC8) . Drives the transmission motor and reception motor.
(10)
Reset circuit (IC9) ........ Provides a reset pulse to each of the major ICs.
(11)
Analog board ................ Composed of the ITS circuit and NCU circuit.
(12)
Sensor section ............. Composed of the cover open sensor, document sensor, recording paper sensor, cutter
..................................... position switch, read position sensor, and jam sensor.
(13)
Switching power ........... Supplies +5V and +24V to the unit.
        supply section
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121
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KX-FT57E
General Block Diagram
POWER SUPPLY
RECTIFIER SW. TRANS
+24V
NOISE
FILTER
SW. MOS
MOS SW
+5V
+5V
+24V
OPERATION PANEL
SENSOR
LED
DOC READ-POSITION
LCD
LCD
LCD
CONTROLLER
G/A
KEY MATRIX
SERIAL I/F
RESET
BATT
RESET
IC9
ROM
RAM
2M
BIT
IC2
FLASH
MEMORY
IC4
256K
BIT
IC3
HEAD
ON
IC8
DIGITAL PCB
HEAD POWER
THERMAL
HEAD
SENSOR
CUT-POS
ANT-CURL
LED ARRAY
TO CCD
+24V
+5V
TR
SW
F1,F2,FR,FTG
VID
CCD BLOCK
I/O
HEAD TEMP.
24MHz
PRINTER
CONTROL
FLASH ROM
CONTROL
OSC
CPU
I/F
OP PANEL
I/F
MOTOR I/F
IC7
IC8
RXM
TXM
MOTOR
DRIVER
RX MOTOR
ANTI CURL
TX MOTOR
IC5
MODEM
TONE1
T2/BEL
AC
+24V
+5V
IC1
CPU-ASIC
T7D56
BACK UP   VCC
ADDRESS
BUS
DATA BUS
IC6
CODEC
TXA
IN
RIN
A/D
IMAGE
PROCESSING
DC/DC
CONVERTER
+   -
MODRX
MODSRX
MODTRX
DATA
ADDRESS
HANDSET
MIC
SPEAKER
MIC
DTMF
RECEIVER
IC4
4.19MHz
CROSS POINT SW
ALC
T1
IC10
IC10
G/A
IC5
I/O PORT
I/O PORT
SPEAKER AMP
IC3
SPMUTE
SPEAKER
COVER
SET SW
PAPER
SET SW
HOOK
SW
+5V
+5V
+5V
+5V
JAM
DETECT
T2
–
+
~
~
D6
RLY1
TEL LINE
E
a
b
S
ANALOG PCB
+5V
+5V
Q3
DC
LOOP
TXD
RXB
T1/T2
RIN
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