1 – 105Chapter 1 TroubleshootingFIP4.8 SENSOR NO PAPERStep Check Yes NoPossible causes:SENSOR NO PAPER (PL20.2.33)ACTUATOR NO PAPER (PL20.2.6)HARNESS ASSY CLSNR1 (PL20.2.31)HARNESS ASSY CLSNR2 (PL20.1.36)550 PAPER CASSETTE (PL20.3.50)Option 550 Paper Feeder PWBA FEEDER 550(PL20.1.34) HVPS/MCU (PL12.1.19)1Checking ACTUATOR NO PAPERRemove Option 550 Paper Feeder. (RRP20.1)Install 550 PAPER CASSETTE.Move ACTUATOR NO PAPER with a finger.Does ACTUATOR NO PAPER operate smoothly?Does the flag go into the detecting area of the sensorwhen the paper is set, and out of the detecting areawhen there is no paper?With tool Go tostep 2. Withouttool Go to step 3.Replace ACTUA-TOR NO PAPER.2Checking SENSOR NO PAPER (1)Install Option 550 Paper Feeder. (RRP20.1)Remove EP CARTRIDGE.Close COVER OPEN (PL1.1.2).Remove 550 PAPER CASSETTE.Put the hand in the cassette insertion space, moveACTUATOR NO PAPER.Does the number increase one by one, as ACTUATORNO PAPER operates?Check using Chapter 2 Diagnostic [Sensor/SwitchCheck].Replace HVPS/MCU.(RRP12.10)Go to step 3.3Checking SENSOR NO PAPER (2)Install Option 550 Paper Feeder. (RRP20.1)Remove EP CARTRIDGE.Close COVER OPEN (PL1.1.2).Remove 550 PAPER CASSETTE.Put the hand in the cassette insertion space, moveACTUATOR NO PAPER.Is the voltage across P/J85-7(+) and P/J85-6(-), 0 VDCwhen ACTUATOR NO PAPER is held up, and 3.3 VDCwhen released?Go to FIP4.6, 4.7PWBA FEEDER550.Go to step 4.4Checking HARNESS ASSY CLSNR1 for continuityRemove HARNESS ASSY LSNR1.Is there continuity betweenJ855-5 and J852-3?J855-6 and J852-2?J855-7 and J852-1?Go to step 5.Replace HAR-NESS ASSYCLSNR1.5Checking HARNESS ASSY CLSNR2 for continuityDisconnect connector P/J85 from PWBA FEEDER 550.Is there continuity betweenJ85-5 and J855-3?J85-6 and J855-2?J85-7 and J855-1?Go to step 6.Replace HAR-NESS ASSYCLSNR2.
