76 Phaser 5400 Laser Printer Service GuideRAP 17 Insert MBFThe Multi-sheet Bypass Feeder (MBF) is extended and is not in the home position.Table 37 Insert MBF Troubleshooting ProcedureStep Actions and Questions Yes No1 PROCEDUREExtend and close the MBF.Does the error code still appear?Go toStep 2.Problemsolved.2 MBF HOME SWITCH INSPECTION1. Extend the MBF and inspect the MBF Home Switch.2. Manipulate the MBF Home Switch Actuator.Is the MBF Home Switch in good condition anddoes the actuator move freely?Go toStep 3.Replace theMBF HomeSwitch[RRP 3.8,page 282].3 MBF HOME SWITCH TEST1. Enter Diagnostics mode.2. From the Main Menu, select Component Test / SensorInput / press [4] to start, [0] to stop.3. Actuate and deactuate the MBF Home Switch.Does the LCD counter increment each time youpress and release the actuator?Replace thePrint EngineControllerBoard[RRP 8.5,page 310].Go to Step 44 ìNOî FROM STEP 4 ABOVE1. Switch printer power OFF.2. Remove the Left Side Cover [RRP 1.1, page 250] andthe Print Engine Controller Cover [RRP 8.5,page 310].3. Disconnect P/J20 from the Print Engine ControllerBoard.4. Switch printer power ON.5. Measure the voltage between P20-1 and frameground.Does the voltage between P20-1 and frameground measure +3.2 VDC?Go toStep 5.Replace thePrint EngineControllerBoard[RRP 8.5,page 310].5 ìYESî FROM STEP 4 ABOVE1. Switch print power OFF.2. Reconnect P/J20 to the Print Engine Controller Board.3. Switch printer power ON.4. Measure the voltage between P20-2 and frameground as you actuate and deactuate the switch.Does the voltage measure +3.2 VDC when theswitch is actuated and 0.0 VDC when the switchis deactuated?Replace thePrint EngineControllerBoard[RRP 8.5,page 310].Replace theMBF HomeSwitch[RRP 3.8,page 282].
