EPSON Stylus Photo RX700 Revision A
Operating Principles Operating Principles of Electric Circuitry 47
2.3.3.6 Main Board Circuit Configuration (Scanner Section)
2.3.4 Panel Board
C583PNL consists primarily of the following circuits:
Power switch circuit
Switching circuit
LED circuit
IC Location Functions
Scanner interface
circuit
Image sensor type: CCD (ILX181K by Sony)
Sensor resolution: 3200 dpi
TPU: Provided
Data transfer method: AFE is mounted on the ISN Board
Light source: White cold-cathode fluorescent lamp (42 V)
<AFE specifications>
AFE Type : S1R77012F00A000 (by Epson)
Number of bits: 16
Number of channels: 3
Maximum operating frequency: 10 Msps
Reference voltage: 1[V]
Offset adjustment range:
±250 mV
Gain adjustment range: 0.25~4.25 times
Power down mode: Available
Supply voltage : Analog 3.3 V, 5 V, Digital 3.3 V, 5 V
Package : 100-pin QFP
Scanner motor
drive circuit
IC18
Drive IC: LB1946 (Sanyo)
Drive system : Bipolar constant-current driving
Control method: 2-2/1-2/W 1-2/2W 1-2/4W 1-2 phase circular motion
Current detection resistance: 2.2 Ω
±1% 1/2 Ω
Current value setting: 400 mA (Set by dividing voltage by resistance)
Sensor circuit
Scanner carriage home position sensor
Type: Photo interrupter
LED current: Current is limited by 150Ω
Output logic:L output: Outside the home position
H output: At the home position
Input circuit: Input to SOC port (3.3 V TTL Schmidt)
TPU interface
circuit
Light source: White cold-cathode fluorescent lamp (42 V)
Surface illuminant
Recognition method
• Presence or absence of connections of SOC port input and SOC port
output.
• Grounding of the power supply is detected by SOC port input.
Regulator
Name : PQ12DZ5UJ00H (Sharp)
Application : Circuit to generate the 12 V power for scanner
Input voltage : 12.5 V~14 V
Capacity : 0.15 A
Switch Functions
Functional
switches
Operation
(power) switch
Type: Embossed sheet
Circuit: Connected to the power on/off control circuit on the Main
Board.
Logic: PSC is controlled so that power does not turn off by
switch-off after the power is turned on by switch-on.
Power is turned off by the PSC controlled when switch-
on is detected after power on.
Function: Operation (power supply on the secondary side)
Others: Connected to both the power supply side and Main side.
Stop switch
Type: Embossed sheet
Input circuit:Pull up by 5.6 kΩ
Connected to general-purpose port of E09A57Y* on the
Panel Board
Logic: “Low” by switch-on
“High” by switch-off
Function For operation, forced termination
Others: Forced termination by pressing the stop switch and power
switch together.
Various setting
switches
Type Embossed sheet
Switch: 1
Input circuit:Pull up by 5.6 kΩ
Connected to general-purpose port (PA 15) of E01A56B*
on the Main Board
Logic: “Low” by switch-on
“High” by switch-off
Control switches
Type Embossed sheet
Switches: 18
Input circuit:Pull up by 5.6 kΩ
Connection to general-purpose port of E09A57Y* on the
Panel Board
Logic: “Low” by switch-on
“High” by switch-off
LED
LED (GREEN) : SML-512MWT86 (Rohm)
Drive current : 8 mA (each LED)
Drive circuit: General-purpose port of E09A57Y* on the Panel Board
Current limiting resistance: 390Ω
All the LEDs go out at reset.
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