Lexmark T420(n) Laser Printer Service Manual

General Information Maintenance Approach Special Tools Serial Number Printer Identification Printer Features Memory and User Flash Memory Resolution and Print Quality Print Area Print Media Printer Data Streams Fonts Paper Handling Connectivity Printer Speed RIP Card Specifications Supplies Operator Panel Options Acronyms Diagnostic Information Start Operator Panel Light Patterns Status Information Light Patterns Attendance Information Light Patterns Obtaining Information about Printer Service Error Codes Service Error Codes Power–On Operations Power–On Self Test (POST) Symptom Tables. Diagnostic Aids Operator Panel Menu Definition Configuration Menu Group or Diagnostic Menu Group Printer Diagnostics Mode Continuity Check on HVPS/Cartridge Repair Information Handling ESD-Sensitive Parts Adjustments Printhead Assembly Adjustment Adjusting Paper Feed Alignment Lubrication Re–assembly Removal Procedures. Main Drive Motor Assembly Removal Motor Assembly (Stepper) Removal Main Drive Assembly Removal Reference Plate Assembly Removal Cartridge Coupling Assembly Removal Upper (MPF) Housing Assembly (with Paper Flag) Removal Lower (MPF) Housing Assembly - Paper Sensor Removal Lower (MPF) Housing Assembly Removal MPF Roller Assembly Removal HVPS Card Removal LVPS Card Removal Cooling Fan Removal. Unplug power from the printer before connecting or disconnecting any cable, assembly, or electronic card. This is a precaution for personal safety and to prevent damage to the printer. This chapter contains the codes and diagnostic tools to aid in providing corrective action for a malfunctioning printer. Re–assembly Ensure all cables are re–connected when re–assembling the printer. The printer may not detect a disconnected sensor in some areas without extensive running. For example, the “tray full” sensor has a connector in the left cover and has to be disconnected to remove the rear cover.

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