Picture Image Trouble; Overview - Epson EPL-N3000 Service Manual

EPSON EPL-N3000/AcuLaser M4000N

3.5 Picture Image Trouble

3.5.1 Overview

If any problem involving printing quality occurs, first find out exactly what the
problem is, make a test printing on A4 paper, and then troubleshoot effectively by
using the corresponding picture quality diagnostics.
If the problem cannot be resolved by the procedure described in this section, after
repeating checking, replace "Parts that can be the source of this error" in the order in
which they are given and see if that works.
Before starting troubleshooting, check the paper transport path.
C H E C K
Make sure that the paper path is free from foreign matters, such as
P O I N T
staples, paper clips or bits of paper.
START
Test Printing
Is there
an applicable trouble
item?
Yes
Execute applicable troubleshooting
No
Is the problem solved?
Yes
End
Figure 3-3. Picture Image Troubleshooting Entry Chart
Troubleshooting
No
Execute applicable troubleshooting
No
Is the problem solved?
Yes
End
The following explanation assumes the printer controller functions
C H E C K
properly. You can, however, easily determine whether the problem
P O I N T
lies in the printer controller or engine by conducting a test printing
with the engine alone, except for problems that cannot be
recognized through a test printing.
If the test print by the engine alone is good, the problem is
caused by the printer controller.
If there is something wrong with the test print by the engine
alone, the problem is caused by the engine.
If there may be something wrong with the printer controller,
replace the printer controller and interface cable with properly
functioning ones and see if that works.
If the problem continues to occur, check the host side and perform
troubleshooting efficiently using the following picture quality
diagnostics according to a description of the problem.
This section covers the following typical problems involving picture quality.
3.5.2 Too Light Print (Weak Gradation) ........................................... p.145
3.5.3 Blank Print................................................................................ p.146
3.5.4 Solid Black ............................................................................... p.147
3.5.5 White or Light Bands (parallel with paper transport)............... p.148
3.5.6 White or Light Bands (perpendicular to paper transport)......... p.149
3.5.7 Black Stripes (parallel with paper transport)............................ p.150
3.5.8 Black Stripes (perpendicular to paper transport)......................p.151
3.5.9 Image Partial Missing (White Spots) .......................................p.153
3.5.10 Black Spots ............................................................................... p.154
3.5.11 Ghost Image..............................................................................p.155
3.5.12 Fog ............................................................................................p.156
3.5.13 Skew .........................................................................................p.157
3.5.14 Damaged Paper (Wrinkling).....................................................p.158
3.5.15 Bad Fusing................................................................................ p.159
If bands, stripes or spots appear in a cycle, probably a specific roller is faulty. In such
cases, measure the cycle of the trouble, and check the cycle against the following
pitches (note that each pitch is not always identical with the circumference length of
the roller). Then probably you can solve the problem easily.
Roller
Drum
BTR
Heat Roll
Pressure Roll
Picture Image Trouble
Parts Name Roller Diam. (mm)
Imaging Cartridge 30.5
BTR ASSY 16.2
FUSER ASSY 24.9
FUSER ASSY 30
Revision C
Pitch (mm)
94.3
50.7
78.3
94.2
144
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