Phaser 4400 Laser Printer Service Manual 2-33Install or Reseat Print Cartridge.(J3: Missing Print Cartridge)1. Print Cartridge is not installed or seated correctly.2. The installed Print Cartridge is not the correct one.Print Cartridge Installation Troubleshooting ProcedureStep Actions and Questions Yes No1 1. Open the Front Cover and remove the PrintCartridge.2. Inspect the tab on the top center of the Print Cartridgethat actuates the Print Cartridge Sensor Assembly.Is the tab on the Print Cartridge intact?Go to step 2. Replace thePrintCartridge (PL8.1 onpage 7-20).2 Press and release the Print Cartridge Sensor AssemblyActuator.Does the Print Cartridge Sensor AssemblyActuator move smoothly?Go to step 3. Replace thePrintCartridgeSensorAssembly(RRP 7.3 onpage 6-81).3 1. Enter Service Diagnostics and select Sensor Tests.2. Scroll to Print Cartridge Sensor test and press OK.3. Insert and remove the Print Cartridge a few times.Does the display alternate between ìNotInstalledî and ìInstalledî as you remove andreplace the Print Cartridge?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Go to step 4.4 1. Switch the printer power OFF.2. Remove the Left Interface Cover (RRP 1.1 onpage 6-6), the Left Cover (RRP 1.2 on page 6-7), andthe Left Plate (RRP 1.11 on page 6-16).3. Install the Print Cartridge. Leave the Front Coveropen.4. Disconnect P/J25 from the Engine Logic Board.5. On the Engine Logic Board, check for continuitybetween J21-4 and J25-3, and J25-2 and J25-1 asyou insert and remove the Print Cartridge.Is there continuity between J25-4 and J25-3, andJ25-2 and J25-1 when you insert the cartridgeand no continuity when you remove thecartridge?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Go to step 5.5 Is the Print Cartridge a Xerox Phaser 4400 PrintCartridge?Replace thePrintCartridgeSensorAssemblytogether withthe harness(RRP 7.4 onpage 6-81).ReplacePrintCartridgewith a XeroxPhaser 4400PrintCartridge (PL8.1 onpage 7-20).
