Epson Perfection 4490 Photo - Troubleshooting

EPSON Perfection 4490 Photo Revision B
TROUBLESHOOTING Troubleshooting 27
3.2 Troubleshooting
This section provides troubleshooting procedures based on observed faults.
Refer to Table 3-4, and choose the table describes the general fault indication. Within
the table, find the Problem that most closely matches what you observe and follow the
procedures given in the table cross referenced in the right-hand column.
Table 3-4. Trouble Phenomenon, Cause and Troubleshooting Table
Problem Definition
Troubleshooting
Table
Scanned image quality error. Scanned image is not clear. 3-5
The main unit does not operate
when powered-on.
The Main Unit does not perform
initialization operation.
3-6
The host does not recognize the
scanner when power is switched on.
3-7
Fatal error. (The LED flashes red.)
Recovery cannot be made when
power is switched on again.
The Carriage Unit does not operate. 3-8
The Fluorescent Lamps are not lit.
3-9
The TPU does not work at all. The TPU does not operate. 3-10
The TPU Carriage Unit does not
operate.
3-11
The Fluorescent Lamps of the TPU do
not light up.
3-12
Table 3-5. Scanned Image Quality Error.
Step Possible Cause Corrective Action
1
The Document Glass is not clean. (Image
has white spots)
Clean the glass.
(Refer to 6.1.1 Cleaning)
2
The mirror in the Carriage is not clean.
(Vertical bands appear on the image.)
Clean the mirror.
(Refer to 6.1.1 Cleaning)
3
Upper Housing failure
(The white document mat is deformed or is
not clean.)
Replace the Upper Housing.
4 CCD Sensor Board failure Replace the Carriage Unit.
5 Main Board failure Replace the Main Board
6 Carriage mechanism failure Replace the Carriage mechanism.
Table 3-6. The Main Unit does not perform initialization operation.
Step Possible Cause Corrective Action
1
There are some connectors that are not
connected correctly
Connect them correctly.
Replace the Main Board
2 CR Motor failure Replace the CR Motor.
3 Main Board failure Replace the Main Board
Table 3-7. The host does not recognize the scanner when power is switched on.
Step Possible Cause Corrective Action
1 The host computer does not support USB. Replace or modify the host computer.
2
The TWAIN Driver supplied with the
scanner has not been installed correctly.
Install (reinstall) the TWAIN Driver for the
Perfection 4490 Photo.
3 The USB cable is damaged. Replace the USB cable.
4 Main Board failure Replace the Main Board