Overview; Preliminary Check; Troubleshooting Procedure - Epson Stylus Pro 7400 Service Manual

EPSON Stylus Pro 7400/7800/9400/9800

3.1 Overview

This section explains the basic procedure for troubleshooting problems on the printer
quickly and efficiently.

3.1.1 Preliminary Check

Make sure to verify or perform the following basic items whenever servicing the
printer.
1. There is no foreign material which interferes with the proper operation of the
printer.
2. Print out the status sheet following the procedure below.
1. Check that the printer is in "Ready" status, and press the [Menu
and select TEST PRINT by pressing the [Paper Feed
2. Press the [Menu ] button again and press the [Paper Feed
select STATUS SHEET.
3. With the STATUS SHEET highlighted, press the [Menu
[Enter ] button to print the status sheet.
Check the information printed on the status sheet to find out possible causes of the
error; if the main units have reached their end of life, or if there is something
wrong with the user-defined panel settings. If it is the panel setting error, see Step
9.
3. Both outside and inside of the printer are free of significant dirt. Clean it if
significant dirt is observed.
4. None of the parts or components of the printer are missing, chipped or damaged.
5. All of the harnesses are free of damages and properly connected to their
connectors correctly.
6. The cams and gears in the printer mechanism are engaged correctly showing no
signs of wear.
7. When smudges appear on printed pages, clean the rubber rollers in the printer
mechanism if it solves the problem.
8. The rubber rollers in the printer mechanism are engaged correctly showing no
signs of wear.
9. Initialize the NVRAM on the C594 Main Board (reset the user-defined panel
settings to their factory default) if necessary.
Execute the DEFAULT PANEL in the Maintenance mode.
Troubleshooting
W A R N I N G
C A U T I O N
] button
] button.
] button to

3.1.2 Troubleshooting Procedure

] button and
Follow the flowchart given below to troubleshoot problems efficiently.
Occurrence of Troubles
"Troubleshooting based on Panel Messages"
"Remedies for Warning
Messages" (p.178)
Overview
When handling the lithium battery used for backup of the RTC on
the Main Board, strictly follow the safety instructions given in
"4.1.1 Precautions" (p.208).
Before disassembling/reassembling the printer, be sure to turn
the power switch OFF, confirm the panel display disappears
and unplug the power code.
Always use the recommended tools for disassembling/
reassembling, adjusting or servicing the printer.
Always use the specified lubricant and adhesive.
Be sure to perform the required adjustments.
"Troubleshooting based on Printed Result"
(p.172)
"Remedies for Error
Messages" (p.181)
Revision B
(p.203)
"Remedies for Service Call
Errors" (p.188)
171