Diagnostic Aids; Analyzing The Test Print; Using Test Print To Locate A Feed Or Paper Transport Problem; Using Test Print To Analyze A Print Quality Problem - Lexmark W820 Service Manual

3. Diagnostic Aids

Diagnostics are built into the printer MCU PWB (Engine Card) and can be accessed from
the printer Operator Panel.
Diagnostics includes: Button Test, LCD Test, Error Log, Printer Setup, Configuration ID,
Device Test, base Sensor Test, and a demo or print test page.

Analyzing the Test Print

Test Prints provide several uses in troubleshooting the printer problems.
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Using Test Print to Locate a Feed or Paper Transport
Problem
Use Test Print to locate a problem with paper feed or with paper transportation along the
paper path.
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Using Test Print to Analyze a Print Quality Problem

Due to the method used to generate Test Prints, grid lines may display a noticeable
amount of jitter or unevenness. This is normal for Test Prints.
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4025-XXX
Isolating problems to either the print engine (MCU PWB) or to the ESS PWB
(Controller Card) and host software.
Locating feed and paper transport problems.
Detecting print quality and image registration problems.
Enter Printer Diagnostics and generate a Test Print.
Follow the paper along the paper path until the problem occurs.
Print a sample image from the host computer.
Enter Printer Diagnostics and generate a Test Print.
If the print quality problem occurs when you print from the host computer but does
not occur when you print from Diagnostics, the problem may be in the ESS PWB, in
the print driver software, or in the application software on the host computer.
If the print quality problem occurs on the Test Print, then the problem is caused by
the print engine.
If the print quality problem is an image registration problem, go to
Registration" on page 3-32.
"Setting Printer
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Diagnostic Aids