Epson Stylus 820 Service Manual page 95

Troubleshooting
[Step 8] Select the option 5 or option 6 depending on your printer head. Then the display indicates the "MC
No. ? "_"
[Step 9] Press the return key. Then the printer automatically prints a check pattern.
First, the TOF line is printed, then the 360-DPI full duty pattern will be appeared.
2.BETA(With the black head)
3.BETA(With the color head)
Note: Select the correct value on the display because both pattern and color are different depending on
the head units.
[Step 10] We can imagin the miss-alignment or the dot-missing if the above pattern has a white banding or
the smear part, so that advance to next step (Section 5.5.1.2) on the main flow-chart.
5.5.1.2 Standard of " Does the printing normal?"
If the 360-DPI printing pattern has a under problem, advance to next step (Section 5.5.1.3)
There is a hollow place.
5-10
Figure 5-3. 360-DPI Check Pattern
Smear part
Smear part
Figure 5-4. Standard of Dot-missing
Stylus Color IIs / Stylus 820
There is a projection part.
White banding
Rev. A