Phaser 4500/4510 Service Manual 4-43General TroubleshootingOptional 550-Sheet Feeder Low Paper SensorTroubleshooting ReferenceApplicable Parts Wiring and Plug/Jack Map References■ Low paper sensor■ Low paper actuator■ Low paper sensor harness■ Feeder harness 2■ Optional 150-sheet paperfeeder■ 550-sheet paper cassette■ 550-sheet feeder PWBA■ Bottom plate assembly■ HVPS/engine logic board■ “550-Sheet Feeder Signal Diagram” onpage 10-33■ “550-Sheet Feeder General Wiring Diagram” onpage 10-32■ “550-Sheet Feeder Plug/Jack Locator” onpage 10-12Troubleshooting ProcedureSteps Actions and Questions Yes No1 Check the low paper actuator:1. Remove the Optional 550-Sheet Feeder(page 8-86).2. Install a 550-sheet paper cassette.3. Move the bottom plate assembly up anddown.Does the low paper actuator operatesmoothly?Does the flag move between the sensorarms when the bottom plate assembly isup (the low paper actuator is pushed up),and out of the sensor arms when thebottom plate assembly is pressed down?Go to step 2. Replace thelow paperactuator.2 Check the low paper sensor (1):1. Install Optional 550-Sheet Feeder(page 8-86).2. Remove 550-sheet paper cassette.3. Enter Service Diagnostics, and from theSensor Tests menu select the Tray 3/4 Low Paper test.4. Manually operate the low paper actuator.Does the sensor correctly indicate theposition of the actuator?Replace theHVPS/enginelogic board(page 8-73).Go to step 3.
