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F64:
Gamma data Read /
Write error

AF 00 00 00 1.Gamma data couldn't be

   properly sent to CONTROL
   Board via USB interface.

1. Restart the scanner, and then execute
   "Carriage Drive" in Sec. 9.3.5 to check
   whether the same phenomenon is
   reproduced.
2. Re-connect the USB cable to the
    scanner, and then restart the scanner to
    confirm whether the same error occurs.
3. Replace the USB cable. 

2. CONTROL Board does not
    work properly.

1. Restart the scanner to confirm whether
    the same error occurs.
2. Check the soldering condition of ASIC,
    JP5, and their surrounding circuits on
    the CONTROL Board.
3. Replace the CONTROL Board.

3. The power supply to the
    circuit on the CONTROL
    Board was interrupted. 

1. Re-connect the AC Adaptor to the
    scanner, and then restart the scanner to
    confirm whether the same error occurs.
2. Replace the AC Adaptor.

F65:
Lamp in the
Scanning Unit
cannot be turned on.

B2 00 00 00 1. Power (+24 V) is not

    properly supplied to the LED
    Lamp included in the
    Scanning Unit.

1. Restart the scanner, and then execute
   "Carriage Drive" in Sec. 9.3.5 to check
   whether the same phenomenon is
   reproduced.
2. Check the following connection and
    soldering condition on each connector:
      (1) JP1 (CCD Board) to LED Lamp
      (2) CN1 (CCD Board) to CN2
           (CONTROL Board)
      (3) JP2 (CONTROL Board) to AC
           Adaptor
3. Replace faulty parts.

2. The Scanning Unit does not
    work properly.

1. Check the following connection and
    soldering condition on each connector:
       

→ JP1 (CCD Board) to LED Lamp

2. Replace the Scanning Unit.

3. CONTROL Board does not
    work properly.

1. Restart the scanner to confirm whether
    the same error occurs.
2. Check the soldering condition of ASIC,
    JP5, and their surrounding circuits on
    the CONTROL Board.
3. Replace the CONTROL Board.

4. The power supply to the
    circuit on the CONTROL
    Board was interrupted. 

1. Re-connect the AC Adaptor to the
   scanner, and then restart the scanner to
   confirm whether the same error occurs.
2. Replace the AC Adaptor. 

5. There was a USB
    communication error
    between PC and CONTROL
    Board.

1. Re-connect the USB cable to the
    scanner, and then restart the scanner to
    confirm whether the same error occurs.
2. Replace the USB cable

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F66:
Carriage-feed error

B4 00 00 00 1. Carriage-feed mechanism

    has some problems. 

1. Execute "Carriage Drive" in Sec. 9.3.5
    to check whether this phenomenon is
    reproduced.
2. Check the mechanical condition of 
   the belt and gears on the Motor Assy.
3. Check the belt tension controlled by the
    Tension Plate Assy.
4. Check the Shaft for the carriage is
    properly assembled.
5. Replace faulty parts.

2. Motor drive signals from the
   CONTROL Board are not
   transmitted to the Carriage
   Motor. 

1. Check the following connection and 
    soldering condition on each connector:
     (1) JP3 (CONTROL Board) to Carriage
          Motor
     (2) JP2 (CONTROL Board) to AC
         Adaptor
2. Replace faulty parts.

3. Scanner is not be put on a
    horizontal level area.

Set the scanner on a horizontal level area.

F67:
Scanner can’t find
the reference mark.

B7 00 00 00 The scanning Unit receives an

excessive exposure to the
sunlight or other light.

1. Close the Document Cover.
2. Retry the image scanning. 

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In this system, the ASIC controls the AFE, motor, SDRAM and amplifier:
When receiving the start command from a PC, the ASIC performs some calibrations to check whether 
the scanner is ready to normally scan documents by activating the CCD and Carriage Motor. 
After that, the series of scanning processes start.
The CCD block will scan the pixel data (analog signals (R, G, B)) from the documents, and then transmits
 the data to AFE Block through three channels: R, G, and B
The AFE Block will convert the pixel data (analog signals (R, G, B)) into the digital data.
The converted digital data is stored to the SDRAM controlled by the ASIC.
After the ASIC finishes processing the digital data according to the instructions from the PC,   
the ASIC will send the processed data to the PC though the USB interface.

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