Epson Perfection 1200U Service Manual page 30

EPSON Perfection1200
Table 3-8. Scanned image is unclear
Cause Step Checkpoint
Mirror in the carriage 1 Is the image
unit is dirty. scanned clearly
after cleaning the
mirror?
CCD sensor board is 2
broken.
Main board is 3
broken.
Table 3-9. SCSI Interface Error
Cause Step Checkpoint
Terminator switch is 1 Check the user's
set wrong. guide for the
correct setting. Is
the setting correct?
SCSI setting is 2 Check the user's
wrong. guide for the
correct setting. Is
the setting correct?
TWAIN driver, which 3 Is the TWAIN driver
comes with the installed correctly?
scanner is not
installed correctly.
SCSI cable is 4 Replace the SCSI
defective. cable. Is the
operation normal?
Main board is 5
broken.
Troubleshooting
Finding Solution
No Clean the lamp
surface.
--- -- Replace the CCD
board.
--- --- Replace the main
board.
Finding Solution
No Set the terminator
correctly.
No Set the SCSI
correctly.
No Install the TWAIN
driver correctly (or
reinstall)
Yes Replace the SCSI
cable.
--- --- Replace the main
board.
Cause
Host and O/S
(Windows95/98)
does not support the
USB.
TWAIN driver, which
comes with the
scanner is not
installed correctly
USB cable is broken.
Main board is
broken.
Table 3-11. Option TPU/ADF does not operate
Cause
The cable of the
optional unit is
disconnected.
Main board is
broken.
Optional unit is
broken.
Troubleshooting
Table 3-10. USB Interface Error
Step Checkpoint Finding
1 On the Windows, No
go to "My
→
Computer" "Prope
→
rty" "Device
Manager", then,
check if "Universal
serial bus
controller" is
effective.
2 Is the TWAIN driver No
installed correctly?
3 Replace the USB Yes
cable. Is the
operation normal?
4 --- ---
Step Checkpoint Finding
1 Is the connector Yes
CN1 on the control
board
disconnected?
2 --- ---
---
3 +24V line:Lamp,
Motor
+5V line: Sensor,
logic circuit.
Revision B
Solution
Replace the host.
Install the TWAIN
driver correctly (or
reinstall)
Replace the USB
cable.
Replace the main
board.
Solution
Connect the CN1
properly.
Replace the main
board.
Replace the
defective part of the
optional unit.
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