2-40 Phaser 4400 Laser Printer Service ManualTray 2 (or Tray 3) Paper is Low.Paper stack in Tray 2 and/or Tray 3 is below 50 ±30 sheets.Low Paper (Tray 2 or Tray 3) Troubleshooting ProcedureStep Actions and Questions Yes No1 Fill the affected paper tray with fresh paper.Is the Error Message still displayed?Go to step 2. Problemsolved.2 1. Remove the paper tray from affected FeederAssembly.2. Manually push up and release the low paper actuator.Does the low paper actuator move smoothly upand down?Go to step 3. Inspect theLow PaperActuator.Repair orreplace asrequired.3 1. Enter Service Diagnostics and select Sensor Tests.2. Scroll to Tray 2 (or Tray 3) Low Paper Sensor andpress OK.3. Press and release the Low Paper Actuator.Does the message on the Front Panel displayalternate between Low and Not Low as youpress and release the actuator?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), Left Cover (RRP 1.2 on page 6-7), and theLeft Plate (RRP 1.11 on page 6-16).3. Switch the printer power-on.4. On the Engine Logic Board, check the voltagebetween P/J33 pin 8 and frame ground.Is the voltage +3.3 VDC?Go to step 6. Go to step 5.5 On the Engine Logic Board, check the voltage betweenP/J28 pin 10 and frame ground.Is the voltage +3.3 VDC?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Replace theLVPS (RRP9.5 onpage 6-91).6 1. Enter Service Diagnostics and select Sensor Tests.2. Scroll to Tray 2 (or Tray 3) Low Paper Sensor andpress OK.3. As you actuate the Low Paper Sensor, check thevoltages at the following locations on the EngineLogic Board:For Tray 2, check between P/J33 pin 9 and frameground.For Tray 3, check between P/J33 pin 10 and frameground.Does the voltage change from +3.3 VDC to 0.0VDC?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Replace theLow PaperSensor(RRP 11.14,page 6-133)for theaffected tray.If theproblempersists,replace theFeeder PWB(RRP 11.9,page 6-128)then the SizePWB(RRP 11.19,page 6-139).
