Have ou gone into your menus. Into troubleshooting, then image quality.
You will want to run both the eliminate light stripes and eliminate smears procedures. that will purge the print head, blow air through the jets and hopefully resolve the problem. I do believe the 8550 has a Jet Substitutin procedure where you can do a workaround and make other jets make up for the light areas.
here are some directions, Will forward more
- Press the [Up] or [Down] arrow button on the Control Panel to
select [Troubleshooting] on the Display Screen, and then press the [OK]
button.
- Press the [Up] or [Down] arrow button to select [Print Quality Problems], and then press the [OK] button.
- Press the [Up] or [Down] arrow button to select [Troubleshooting Print Quality Page], and then press the [OK] button.
- Evaluate the 'Light Stripes Test' page for missing printhead jets,
such as missing Cyan, Magenta, Yellow or Black color bars. The 'Light
Stripes Test' page is the last page of the Troubleshooting Print
Quality Page that printed.
WARNING: To avoid injury, do not touch the sharp metal strip attached to the clear rubber wiper blade in the Maintenance Kit.
- Use a clean lint-free cloth or a new paper coffee filter to gently
clean the maintenance unit's clear rubber wiper blade, use only a
wiping motion across the entire length of the wiper blade, and then
empty the waste tray. A dirty maintenance kit wiper blade can cause
white lines and weak or missing printhead jets.
- Repeat step 3 to reprint the Troubleshooting Print Quality Pages.
If there are no missing or partially missing color bars then the print
quality problem has been resolved. If there are missing or partially
missing color bars then the printhead cleaning procedure will need to
be performed. Continue with the next section.
To clean the printhead using the basic eliminate light stripes procedure:
- Press the [Up] or [Down] arrow button on the Control Panel to
select [Troubleshooting] on the Display Screen, and then press the [OK]
button.
- Press the [Up] or [Down] arrow button to select [Print Quality Problems], and then press the [OK] button.
- Press the [Up] or [Down] arrow button to select [Eliminate Light Stripes], and then press the [OK] button.
- Press the [Up] or [Down] arrow button to select [Basic], and then
press the [OK] button. The printer will perform a head cleaning, which
will take about five minutes. The printer will then print a cleaning
page and a light stripes test page.
- Repeat steps 1 - 4 one more time. If there are no weak or missing
jets then the print quality problem has been resolved. If there are
still weak or missing jets after two basic light stripe cleanings,
continue with step 6.
NOTE: Do not try the Advanced Eliminate Light Stripes Cleaning mode without performing two basic cleanings first.
To clean the printhead using the advanced eliminate light stripes procedure:
- Press the [Up] or [Down] arrow button to select [Advanced], and then press the [OK] button.
- Select the missing jet color and number. If necessary, check the
light stripes test page to determine the color and jet number of the
missing jet.
NOTE: Only perform the advanced light stripe cleaning once. If weak or missing jets still persist, continue with step 8.
- Print the Troubleshooting Print Quality Page. Evaluate the Light
Stripes Test page for missing printhead jets, such as missing Cyan,
Magenta, Yellow or Black color bars. If necessary, perform the basic
eliminate light stripes procedure one more time. If the Advanced
Eliminate Light Stripes procedure does not resolve the weak or missing
jets, perform the Enable Jet Substitution Mode. See the Related Items below.
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