Phaser 4400 Laser Printer Service Manual 3-9Inoperative PrinterNo response from printer when the main power is switched on.8 Check the Connector Harness Assembly.Is the Connector Harness Assembly OK?Replace theEngine LogicBoard (RRP9.3 onpage 6-89).Replace theConnectorHarnessAssembly(PL 8.1 DriveandXerographicson page 7-20Inoperative Printer Troubleshooting ProcedureStep Actions and Questions Yes No1 Ensure the power cord is properly connected to the walloutlet and to the Power Receptacle of the printer.Does the problem still exist?Go to step 2. Problemsolved.2 Perform Verifying AC Power on page 3-2, then returnhere.Did ìVerifying AC Powerî indicate that correctAC voltage is being supplied to the printer?Go to step 3. Notifycustomerthat thepower is outofspecification.3 Perform DC Power (LVPS) on page 3-4, then returnhere.Did ìDC Power (LVPS)î indicate that correct DCvoltage is being supplied to the printer?Go to step 5. Go to step 4.4 Did ìDC Power (LVPS)î instruct you to replace acomponent?Replacecomponentasnecessary.Perform DCPowerLoading onpage 3-6.5 On the Image Processor Board, check the voltage onJ910 between pins 1 and 2.Is the voltage +3.3 VDC?Go to step 8. Go to step 6.6 1. Switch the printer power OFF.2. Disconnect J910 from the Image Processor Board.3. Switch the printer power ON.4. Check the voltage between pins 1 and 2 on thedisconnected plug.Is the voltage +3.3 VDC?Go to step 7. Replace theLVPS (RRP9.5 onpage 6-91).Low Toner Sensor Failure Troubleshooting Procedure (cont'd.)Step Actions and Questions Yes No
