02/20002-35DocuPrint N2025/N2825 RAP 33, RAP 34Status Indicator Repair Analysis ProceduresInitial IssueReplace the Print Engine Controller PWB (REP 8.5).It appears that the MBF No Paper Sensor is working correctly. If a problem persists, replace thePrint Engine Controller PWB (REP 8.5).RAP 34 Tray 1 No Paper SensorProcedureRemove Tray 1. Enter Diagnostics and select Component Test. Scroll to Sensor Input test andpress Enter. Actuate and deactuate the Tray 1 No Paper Sensor Actuator. The number on theLCD increments each time you press and release the actuator.Y NVisually inspect the Tray 1 No Paper Sensor Actuator. The actuator moves freely and isin good condition (not broken or damaged).Y NReplace the Tray 1 No Paper Sensor Actuator (PL 4.2).Switch the printer power off. Remove the Left Side Cover (REP 1.1) and the Print EngineController PWB Cover (REP 8.5). Disconnect P/J12 from the Print Engine ControllerPWB. Switch the printer power on. On the Print Engine Controller PWB, measure the volt-age between P12 pin 4 and frame ground and between P12 pin 6 and frame ground.Both voltages are +3.28VDC.Y NReplace the Print Engine Controller PWB (REP 8.5).WARNINGP12 pin 10 is a +24VDC supply line, if accidently shorted to pin 9 you will destroythe Print Engine Controller PWB.Switch the printer power off. Reconnect P/J12 to the Print Engine Controller PWB. EnterDiagnostics and select Component Test. Scroll to Sensor Input test and press Enter. Onthe Print Engine Controller PWB, measure the voltage between P/J12 pin 6 and frameground. There is +3.28VDC between P12 pin 9 and frame ground when the Tray 1 NoPaper Sensor is deactuated and 0.0VDC when actuated.Y NSwitch the printer power off. Disconnect P/J121 from the MBF Assembly and P/J12from the Print Engine Controller PWB. Check the continuity between P/J121 and P/J12 as follows.• J121-12 and J12-4• J121-11 and J12-5• J121-10 and J12-6There is continuity between each of the wires.Y NReplace the MBF Harness Assembly (PL 4.2).Remove the MBF Assembly and disconnect P/J126 from the MBF No Paper Sensor.Check the continuity between P/J126 and P/J121 as follows.• J126-3 and J121-1• J126-2 and J121-2• J126-1 and J121-3There is continuity between each of the wires.Y NReplace the MBF Combo Harness (PL 4.2).Replace the Tray 1 No Paper Sensor Assembly (REP 2.7).A BA B
