Uneven Printing/Poor Resolution - Epson Stylus PRO 7000 Service Manual

EPSON Stylus Pro 7000
3. If the extra ink charge does not clear the clogged nozzles, confirm the
following.
There is no damage to or foreign materials in/around the rubber of
the Cap Assembly
The Cap Assembly valve is operating normally (if it is not, the Cap
Assembly will not properly absorb ink
The Cap Assembly retention spring is working properly.
The ink tubes and pipes between the ink cartridges and printheads
are properly connected and are not damaged (check the nuts for
tightness, the O-rings for warping, and the tubes/pipes for ink
leakage)
Remove the R-side cover and looking from above, make sure both
heads are properly sealed when the printheads are in the capped
position.
Put liquid in the caps and rotate the pump gears by hand to make
sure the pump assembly is working correctly
While performing a cleaning operation, make sure the pump motor
and gears are functioning correcting
Check the FFC connections, and reseat if necessary
4. If after following the above steps the printout still shows missing dots,
replace one of the parts listed below and check the print out.
Main Board
Printhead(s)
Before you uninstall the Main Board or a printhead, make
sure all cables are disconnected. After installing the new
board or head, make sure all cables are properly
connected; if cable connectors not completely inserted,
they can damage circuits
or the heads when current is turned on.
Make sure you replace the correct head, B head or
C head.
Troubleshooting

UNEVEN PRINTING/POOR RESOLUTION

If printout quality suffers from unevenness, poor quality, or similar problems,
check the following.
1. Perform platen gap adjustment
Using the control-panel setting or the diagnostic-program function, check
the platen gap (bi-directional printing position as well as PG adjustment).
2. If this error occurs only when the user prints on custom or thick paper,
(Use the control panel paper thickness setting to correct the paper size
and the print position (depending on the paper-thickness setting, the
location where the ink strikes the paper may change))
3. If after following the above steps the printout quality has not improved,
verify the following.
Troubleshooting Based on Your Printout
Head angle adjustment
Head height adjustment
When using the "Adj.B (or C) Head Slant" as well as the
"Adj:PG Check Height" functions, always perform the Gap
Adjustment or Bi-directional Position Adjustment operation.
Revision B
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