Perfection 4870 Photo
Revision A
TROUBLESHOOTING
Troubleshooting
31
3.2 Troubleshooting
This section explains troubleshooting from the superficial phenomena.
In this section, troubleshooting is divided on a unit level, based on the superficial
phenomena at occurrence of trouble.
, find the corresponding
phenomenon, and make checks according to the flowchart.
Table 3-3. Trouble Phenomena, Causes and Reference Flowcharts
Phenomenon
Trouble Definition
Cause Location
Reference
Flowchart
If powered ON, the
Main Unit does not
operate.
The Main Unit does not
perform initialization
operation.
• Connector
• Power Supply Board
• Carriage Motor
• Main Board
Occurrence of "Fatal
error".
(The LED flashes red.)
After occurrence of the
above error, recovery
cannot be made if
power is switched on
again.
The Carriage Unit does
not operate.
• Carriage Lock
• Upper Housing
• Connector
• Harness
• Carriage Moving
Mechanism
• CR Motor
• Main Board
The Fluorescent Lamps
are not lit.
• Connector
• Fluorescent Lamps
• Carriage
• Main Board
Scanned image quality
error
An image cannot be
scanned clearly.
• Smudge on Document
Glass
• Smudge on Mirror
• Sheet White Section
• CCD Board
• Main Board
Occurrence of
"Communication
error".
(The LED flashes red.)
After occurrence of the
above error,
"Communication
error" occurs when
communication is
made with the host
again.
The host does not
recognize the scanner if
power is switched on.
• Condition of host
support
(USB, IEEE1394)
• TWAIN Driver
• Cable
(USB, IEEE1394)
• Main Board
The TPU does not
operate.
The TPU does not
operate.
• Cable
• TPU Main Board
• Main Board
The TPU Carriage Unit
does not operate.
• TPU Carriage Lock
• TPU Lower Housing
• Connector
• TPU Harness
• TPU Carriage Moving
Mechanism
• TPU CR Motor
• TPU Main Board
The Fluorescent Lamps of
the TPU do not light up.
• Connector
• Fluorescent Lamps
• TPU Carriage
• TPU Main Board
The LED of the TPU does
not light up.
• Connector
• Sub_C Board
Sub_D Board
• TPU Carriage
• TPU Main Board
Table 3-3. Trouble Phenomena, Causes and Reference Flowcharts
Phenomenon
Trouble Definition
Cause Location
Reference
Flowchart
Summary of Contents for Perfection 4870 Photo
Page 1: ...EPSON Perfection4870Photo Color Image Scanner Service Manual SESC03 008 ...
Page 5: ...Revision Status Revision Date of Issue Description A December 10 2003 First release ...
Page 8: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 19: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 29: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 37: ...C H A P T E R 4 DISASSEMBLY ASSEMBLY ...
Page 63: ...C H A P T E R 5 ADJUSTMENT ...
Page 65: ...C H A P T E R 6 MAINTENANCE ...
Page 68: ...C H A P T E R 7 APPENDIX ...
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