Panasonic UF-590 / UF-790 / DX-600 / DX-800 Service Manual / Other ▷ View online
9
7. Single Copy
8. Multiple Copies
FROM 4MB
Image Memory
(IC10)
LANB
PCB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
D-BUS
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(1)
transFormer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
Laser Printer
(2)
INTERNET
(10Base-T/100Base-TX)
(10Base-T/100Base-TX)
AFE
STLC7550
(IC27)
FROM 4MB
Image Memory
(IC10)
LANB
PCB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
D-BUS
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(1)
transFormer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
Laser Printer
(2)
(3)
(4)
INTERNET
(10Base-T/100Base-TX)
(10Base-T/100Base-TX)
AFE
STLC7550
(IC27)
10
9. Report/List Printing
10. Report with Image Data
FROM 4MB
Image Memory
(IC10)
LANB
PCB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
D-BUS
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(1)
transFormer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
Laser Printer
(2)
INTERNET
(10Base-T/100Base-TX)
(10Base-T/100Base-TX)
AFE
STLC7550
(IC27)
FROM 4MB
Image Memory
(IC10)
LANB
PCB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
D-BUS
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(1)
transFormer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
Laser Printer
(3)
(2)
INTERNET
(10Base-T/100Base-TX)
(10Base-T/100Base-TX)
AFE
STLC7550
(IC27)
11
11. LAN Transmission
12. LAN Reception
FROM 4MB
Image Memory
(IC10)
LANB
PCB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
D-BUS
Laser Printer
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(1)
(2)
transFormer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
INTERNET
(10Base-T/100Base-TX)
(10Base-T/100Base-TX)
AFE
STLC7550
(IC27)
FROM 4MB
Image Memory
(IC10)
LANB
PCB
PCB
LANC
PCB
CPU
V850E/MA1
(IC1)
SHINE
DZAC000273
(IC3)
FROM 4MB
Program
(IC9)
MN86075
(IC30)
MODEM
MN195006
(I22)
D-BUS
Laser Printer
CCD PCB
Line
Line
Memory
Page
Memory
ECM
Buffer
S-DRAM 8MB
(IC7)
(2)
Transformer
(T1)
LAN Controller
(IC1)
RJ45
LINK
ACTIVITY
INTERNET
(10Base-T/100Base-TX)
(10Base-T/100Base-TX)
(1)
AFE
STLC7550
(IC27)
12
1.1.4
Picture Signal Scanning Block
The image data read by the optical unit is input to the CCD mounted on the CCD PC Board, then trans-
ferred to the SC PC Board after the optical information is converted into an electrical signal by the CCD.
The following shows a block diagram of the picture signal scanning circuit. This picture signal scanning cir-
cuit consists of (1) ABC circuit, (2) shading correction circuit, (3) offset control circuit, (4) picture signal
binary coding correction circuit and (5) reducing circuit.
ferred to the SC PC Board after the optical information is converted into an electrical signal by the CCD.
The following shows a block diagram of the picture signal scanning circuit. This picture signal scanning cir-
cuit consists of (1) ABC circuit, (2) shading correction circuit, (3) offset control circuit, (4) picture signal
binary coding correction circuit and (5) reducing circuit.
ABC Circuit
This circuit consists of IC28, IC30, C175, R288 and R285. Its function is to prevent deterioration of pic-
ture quality due to dirt on the document or degrading of the luminous energy of the Xenon Lamp light
source. The picture signal from the CCD is amplified in IC28 and input to IC30, where it is converted
from analog to digital and the shading is corrected. When the signal exceeds +5V as the result of this
amplification and correction, capacitor C175 is charged through R288. This charging voltage lowers the
level of the picture signal input to IC28. When the picture signal voltage rises, this charge voltage
becomes higher. When the picture signal level lowers due to the background color, etc., of a transmitting
document, the voltage of the charged capacitor C175 is discharged through R285. Consequently, the
output of the ABC circuit is kept constant to maintain the picture quality, regardless of changes in the
CCD output level.
ture quality due to dirt on the document or degrading of the luminous energy of the Xenon Lamp light
source. The picture signal from the CCD is amplified in IC28 and input to IC30, where it is converted
from analog to digital and the shading is corrected. When the signal exceeds +5V as the result of this
amplification and correction, capacitor C175 is charged through R288. This charging voltage lowers the
level of the picture signal input to IC28. When the picture signal voltage rises, this charge voltage
becomes higher. When the picture signal level lowers due to the background color, etc., of a transmitting
document, the voltage of the charged capacitor C175 is discharged through R285. Consequently, the
output of the ABC circuit is kept constant to maintain the picture quality, regardless of changes in the
CCD output level.
W
B
1728 bit
Effective Scan Width
CCD
TCD 1208P
Differential
Amplifier
CCD PC Board
SC PC Board
CCD
Drive
Circuit
Delay
[SC]
IC30
MN86075
IC30
MN86075
IC3
DZAC000273
DZAC000273
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