Diagnostic Aids; Entering Diagnostic Mode; Exiting Diagnostic Mode; Analyzing The Test Print - Lexmark W820 - Optra B/W Laser Printer Service Manual

3. Diagnostic Aids

Entering Diagnostic Mode

Press and hold Go and Return as you turn on the printer to access Diagnostic Mode.
While the Diagnostic Menu is active, all host interfaces are offline.
Diagnostics includes: Button Test, LCD test, Error Log, Printer Setup, Configuration ID,
Device Test, base Sensor Test, and a demo or print test page.

Exiting Diagnostic Mode

To exit diagnostic mode and POR the printer into normal user mode, select EXIT
DIAGNOSTICS.Diagnostics are built into the printer MCU PWB (Engine Card) and can
be accessed from the printer Operator Panel.

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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4025-Finisher
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.
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Diagnostic Aids