3-34 Phaser 4400 Laser Printer Service ManualExit Sensor9 Inspect all of the grounds in the printer.Are all the grounds securely connected?ContactXeroxEscalatedHW Support.Repair thebad grounds.Exit Sensor Troubleshooting ProcedureStep Actions and Questions Yes No1 1. Open the printer Rear Cover.2. Remove the Duplex Module, if installed.3. Open the Fuser Access Cover and check that the ExitSensor Actuator moves smoothly and is not broken.Make sure the actuator flag blocks the Exit Sensorwhen the access cover is closed.Is the actuator in good condition and does itmove smoothly?Go to step 2. Replace theFuserAssembly(RRP 6.2 onpage 6-66).2 1. Enter Service Diagnostics, select Sensor Tests andpress OK.2. Scroll to Exit Sensor (Fuser) and press OK.3. Open the rear cover and open the Fuser AccessCover.4. Use a folded piece of paper to block and unblock theFuser Exit Sensor.Does the message on the Front Panel displayalternate between With Paper and Without Paperas you block and unblock the sensor?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Go to step 3.3 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. Disconnect P/J27 from the Engine Logic Board.Switch the printer power ON. Check the voltagebetween P/J27 pin 3 and frame ground.Is the voltage 3.3 VDC?Go to step 5. Go to step 4.4 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).5 1. Switch the printer power OFF.2. Reconnect P/J27 to the Engine Logic Board.3. Switch the printer power ON.4. Measure the voltage between P/J27 pin 5 and frameground as you block and unblock the Fuser ExitSensor.Is the voltage 3.3 VDC when the Fuser ExitSensor is blocked and 0.0 VDC whenunblocked?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Replace theFuserAssembly(RRP 6.2 onpage 6-66).Electrical Noise Troubleshooting Procedure (cont'd.)Step Actions and Questions Yes No
