Lexmark W820 Service Manual - Page 105

4025-Finisher 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. • 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. 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. 1. Enter Printer Diagnostics and generate a Test Print. 2. Follow the paper along the paper path until the problem occurs. Diagnostic Aids 3-1