Epson Perfection 4490 Photo - Page 28

EPSON Perfection 4490 Photo Revision B
TROUBLESHOOTING Troubleshooting 28
Table 3-8. The Carriage Unit does not operate.
Step Possible Cause Corrective Action
1 The Carriage Lock has not been released. Release the Carriage Lock.
2 The Upper Housing is not installed correctly. Install it normally.
3
Connector CN1 on the Main Board is not
connected.
Connect it correctly.
4 The Carriage FFC is not connected correctly. Connect the FFC correctly.
5
Carriage Mechanism failure Replace the Main Board
Does the CR Motor operate normally?
↓
Yes → Disassemble and reassemble the
scanner, or replace the corresponding part(s).
No → Replace the CR Motor.
Table 3-9. The Fluorescent Lamps are not lit.
Step Possible Cause Corrective Action
1
Connector CN1 on the Main Board is not
connected.
Connector CN1 and CN2 on the CCD
Board are not connected.
Connect the disconnected connectors.
2
The lamp is not set on the Inverter Board
correctly.
Set the lamp on the board correctly.
3
Carriage Unit failure ( The Carriage FFC is
not connected to the Main Board and the
Carriage.)
Replace the Carriage Unit.
4 Main Board failure Replace the Main Board
Table 3-10. The TPU does not operate.
Step Possible Cause Corrective Action
1
The TPU Unit Cable is not connected to the
main unit.
Connect the Cable to the main unit.
2
Connector CN5 is not connected to the
Main Board.
Connect it correctly.
3 Main Board failure Replace the Main Board
Table 3-11. The TPU Carriage Unit does not operate.
Step Possible Cause Corrective Action
1
The TPU Unit Cable is not connected to the
main unit.
Connect the TPU Cable to the main unit.
2
The TPU Carriage Lock has not been
released.
Release the TPU Carriage Lock.
3
The TPU Lower Housing is not installed
correctly.
Reinstall it correctly.
4
The TPU Carriage Mechanism Failure.
The three torsion springs are not
attached to the TPU CR Drive Belt
correctly.
Attach them to the belt correctly.
• The TPU CR Motor does not
move normally when powered-
on with the TPU Lower Housing
removed.
• The TPU Carriage Unit does not
move normally with the TPU CR
Motor removed.
Replace the TPU Carriage Unit.
5 TPU CR Motor failure Replace the TPU CR Motor.
6 DRV Board failure Replace the DRV Board.
7 Main Board failure Replace the Main Board
Table 3-12. The Fluorescent Lamps of the TPU do not light up
Step Possible Cause Corrective Action
1
The DRV Inverter FFC is not connected to
CN1 on the TPU Inverter Board and CN3
on the DRV Inverter Board.
Connect the FFC to CN1 and CN3
Connectors.
2
CN2, CN3, and CN4 on the TPU Inverter
Board are not connected.
Connect the connectors.
3
Failure of the SUB_C Board and the
SUB_D Board
Replace the SUB_C Board and the SUB_D
Board.
4 DRV Board failure Replace the DRV Board.
5 Main Board failure Replace the Main Board