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4
1 System Description
1.1.
Electrical Circuit Explanation
1.1.1.
Fax Block Diagram (UF-590/790)
Modem
G3 Signal Contr
ol
DTMF Dialing
D
AA I/F
MJR PCB
UA
R
T
Pic
k up
Solenoid
Pic
k up
Solenoid
No P
aper
Sensor
B-point
Sensor
A-point
Sensor
Speak
er
TEL
LINE
Co
v
e
r
Sensor
50MHz
CCD
(TCD1208A
CY)
W
o
rk
Memor
y
P
age Memor
y
SDRAM
8MB
Scanner
Motor
K
e
y Matr
ix
and
LED
MN86075
15.975
MHz
Motor
Dr
iv
er
3.9656
×
2
MHz
Main
Motor
Motor
Dr
iv
er
Parallel I/F
ASIC
(DZA
C000273)
for 16pels/mm
Pr
inting
for 600dpi
Pr
inting
5MHz
ILS PCB
High V
oltage
P
o
w
er Supply
Prog
ra
m
FR
OM
2MB
Image
FR
OM
2MB
24.576MHz
MN195006
Si3021
Si3015
Handset
(option)
SC PCB
IEEE1284
T
ransceiv
er
CPU
(V850/MA1)
LCD Unit
Heater
Control
+5VP
+5V
+24V
-12V
+3.3V
T
oner
Sensor
Line Memor
y
SRAM
32KB
SDoor
Sensor
P
aper
Exit
Sensor
Timing
Sensor
Cassette
Detect
Sensor
No P
aper
Sensor
Casette
Detect Sensor
SNS2 PCB
CST2 PCB
SNS2 PCB
Fuser LAMP
Ther
mostat
Thermal Fuse
Ther
mistor
SNS4 PCB
SNS1 PCB
AC
SNS3 PCB
AC
I
PCB
LED ARRA
Y
LSU UNIT
OPTION
FR
OM CARD
(Image)
2/4/8MB
3V
Ò3V
Stamp
CPU
C
D
T
Lo
w V
oltage
P
o
w
er Supply
PNL1PCB
15.975
MHz
for Scanner
8.9813
MHz
UF-590/790 Block Diagram
F
acsimile Real Ima
g
e
Pr
ocessor
A/D Con
ver
ter
, White Shading
64 Le
vels Err
or Diffusion
Binar
y Coding,
Scaning Data Reduction
System Handling and Ima
g
e
Na
vigation Engine
Ad
dress Decoder
, SDRAM Contr
ol,
DMA Contr
ol
W
atc
h-dog
Timer(Reset Contr
ol),
IEEE1284 Contr
ol
CIS Contr
ol,
Blac
k Shading,
Motor Contr
ol
Print Quality Contr
ol,
Print Data Reduction
Print Engine Contr
ol(LSU & Heater)
16Mbits Flash R
O
M
Fiemware Pr
ogram Code
Bac
k_up Data (TEL#,
P
arameter etc..)
32-bit RISC CPU (V850/MA1)
PNL CPU
I/F
Ima
g
e
Code/De-code (BC/BE)
SDRAM Contr
ol
I/O P
o
rt
8-bit CISC CPU (uPD780022A)
LCD Unit Contr
ol
K
e
y
Matrix Monitor
LED Contr
ol,
R
T
C
D
AA(Digital Access Arrang
ement)
Line
V
olta
g
e/Loop Current Monitor
A
C/DC
T
ermination,
Ring
er Impedance
Ring Detect,
Pulse Dialing
Integrated Analog Fr
ont End(AFE)
IC1
IC10
IC4
IC1
IC20
IC122
IC124
IC123
IC31
IC30
IC9
IC7
IC3
IC28
IC36,
37
IC38
IC40
Q14
Q16
Q38
Q39
Q33
Q36
Q32
Q35
Q40
Q41
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