Epson Perfection V700 Series, Service Manual

Page: 31 / 90

EPSON Perfection V700 Photo Revision A
Troubleshooting Overview 31
3.1 Overview
This chapter explains the remedies for errors detected by the scanner's
self-diagnostic function, and provides a troubleshooting guide based on
observed problems.
3.1.1 Self-Diagnosing
The scanner has a self-diagnostic function that automatically diagnoses
the operating status of major components, and uses an LED indication to
show the error status. This function detects the following error statuses
shown in the table below. The corrective action is also listed.
Command Error
Fatal Error
3.2 Troubleshooting
This section provides troubleshooting procedures based on observed
faults.
Refer to
Table 3-3 , 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 3-1. Command Error
LED Indication Cause Self-Diagnosing Action
An undefined command or
command parameter was received.
• The scanner ignores the incorrect
command or parameter, and the
current settings are maintained.
• The scanner returns NACK and
waits for the next command or
parameter.
Recovery The error status is canceled upon receipt of a valid command.
Table 3-2. Fatal Error
LED Indication Cause Self-Diagnosing Action
• The lamp has burned out.
• The power is turned on without
releasing the Carriage Lock
• There is a fault in the main unit.
• The scanner switches the lamps
off and stops the operation.
• The scanner sets Bit 7 of the status
bit.
Recovery (After removing the cause of the error)
• Turn the scanner off and then back on.
• Send an initialization command (ESC @) to the scanner.
• Receivable Command: ESC F, ESC f, ESC @, FS F
(None)
(Rapid Blink, Red)
Table 3-3. Trouble Phenomenon, Cause and Troubleshooting Table
Problem Definition
Troubleshooting
Table
Scanned image quality error. Scanned image is not clear. 3-4
The main unit does not operate
when powered-on.
The main unit does not perform
initialization operation.
3-5
Fatal error.
Recovery cannot be made when
power is switched on again.
The Carriage Unit does not operate. 3-6
The Carriage Unit operates, but the
scanner still indicates an error status.
3-7
The Fluorescent Lamps are not lit. 3-8
The TPU does not work at all. The TPU Carriage Unit does not
operate.
3-9
The Fluorescent Lamps of the TPU do
not light up.
3-10
The TPU LEDs do not light up. 3-11
The host does not recognize the
scanner when power is switched
on.
Interface error.
3-12