Main Board Circuit Configuration (Scanner Section); Panel Board - Epson Stylus Photo RX700 Service Manual

EPSON Stylus Photo RX700

2.3.3.6 Main Board Circuit Configuration (Scanner Section)

IC Location
Scanner interface
Image sensor type: CCD (ILX181K by Sony)
circuit
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:
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 IC18
Drive IC: LB1946 (Sanyo)
drive circuit
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
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
Input circuit: Input to SOC port (3.3 V TTL Schmidt)
TPU interface
Light source: White cold-cathode fluorescent lamp (42 V)
circuit
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
Operating Principles
Functions
±
250 mV
1% 1/2 Ω
±
H output: At the home position
Surface illuminant
Operating Principles of Electric Circuitry

2.3.4 Panel Board

C583PNL consists primarily of the following circuits:
Power switch circuit
Switching circuit
LED circuit
Switch
Functional Operation
Type:
switches (power) switch Circuit:
Logic:
Function:
Others:
Stop switch
Type:
Input circuit:Pull up by 5.6 kΩ
Logic:
Function
Others:
Various setting
Type
switches Switch:
Input circuit:Pull up by 5.6 kΩ
Logic:
Control switches
Type
Switches:
Input circuit:Pull up by 5.6 kΩ
Logic:
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.
Revision A
Functions
Embossed sheet
Connected to the power on/off control circuit on the Main
Board.
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.
Operation (power supply on the secondary side)
Connected to both the power supply side and Main side.
Embossed sheet
Connected to general-purpose port of E09A57Y* on the
Panel Board
"Low" by switch-on
"High" by switch-off
For operation, forced termination
Forced termination by pressing the stop switch and power
switch together.
Embossed sheet
1
Connected to general-purpose port (PA 15) of E01A56B*
on the Main Board
"Low" by switch-on
"High" by switch-off
Embossed sheet
18
Connection to general-purpose port of E09A57Y* on the
Panel Board
"Low" by switch-on
"High" by switch-off
47