Epson 1240U Service Manual page 24

EPSON Perfection 1240U
Table 3-6. The lamp does not light up.
Cause Step Checkpoints
CN1 on the 1 Check that CN1 is
main board is disconnected.
disconnected.
CN1 or CN2 on 2 Check that CN1 or CN2 on
the CCD sensor the CCD sensor board is
board is disconnected.
disconnected.
The connector 3 Check that the connector is
for the lamp is properly connected to the
not properly inverter board.
connected to
the inverter
board.
The lamp is 4 After replacing the lamp,
defective. check that the lamp lights
up.
The inverter 5 After replacing the inverter
board is board, check that the lamp
defective. lights up.
The main board 6 ---
is defective.
Table 3-7. Image is not read clearly.
Cause Step Checkpoints
Any mirror in the 1 After cleaning the mirror(s),
carriage unit or check that image is read
the surface of clearly.
the lamp is dirty.
The CCD 2 ---
sensor board is
defective.
The main board 3 ---
is defective.
Troubleshooting
Finding Remedy
Yes Connect CN1 on The host does
the main board not support
properly. USB.
Yes Connect CN1 or
CN2 on the CCD
sensor board The TWAIN
properly. driver attached
for the scanner
No Connect the
is not properly
connector
installed.
properly.
The USB cable
is defective.
Yes Replace the The main board
lamp. is defective.
Yes Replace the
inverter board.
--- Replace the main
board.
The cable of the
optional unit is
disconnected.
Main board is
broken.
Finding Remedy
Optional unit is
No Clean the
broken.
surface of the
lamp.
--- Replace the
carriage unit.
--- Replace the main
board.
Troubleshooting
Table 3-8. USB Interface Error
Cause Step Checkpoints
1 On the Windows, access
My Computer > Property >
Device Manager, and
check that Universal Serial
Bus Controller is effective.
2 Check that the driver for
the scanner is installed
properly.
3 After replacing the USB
cable, check that the error
is not indicated.
4 ---
Table 3-9. Option TPU does not operate
Cause Step Checkpoint
1 Is the connector
CN6 on the control
board
disconnected?
2 ---
3 +24V line:Lamp,
Motor
+5V line: Sensor,
logic circuit.
Revision A
Finding Remedy
No Replace the host.
No Instal the correct
driver properly.
No Replace the USB
cable.
--- Replace the main
board.
Finding Solution
Yes Connect the CN6
properly.
--- Replace the main
board.
--- Replace the
defective part of the
optional unit.
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