Xerox WorkCentre Pro 423 Service Manual

Also see for WorkCentre Pro 423: Scanner guide Fax guide Brochure & specs Fax guide User guide

03/02 Level 2 TroubleshootingWorkCentre Pro 423/428 2-137 CHAPTER 2 TROUBLESHOOTING2.3.6 General-purpose FIPReflection Sensor fault FIPEnter Chain XX Func XXX in Diag (CE) mode. Block the sensorwith blank paper. Is LOW displayed?Y NIs the voltage +5 VDC between the Sensor pin 2 (+) andGND(-)?Y NCheck between the Sensor pin 2 and PWB pin 8 foran open wire or poor contact. If no problem is found,replace the PWB.Is the voltage +5 VDC between the Sensor pin 1(+) andGND(-)?Y NIs the voltage +5 VDC between the PWB pin 4(+)andpin 5(-)?Y NReplace the PWB.Check the wires between the PWB pin 4 and Sensorpin 1 and between the PWB pin 5 and Sensor pin 3for an open wire or poor contact.Check the sensor for contamination or installation fault. Ifno problem is found, replace the sensor.Remove the blank paper from the sensor. Is HIGH displayed?Y NDisconnect the sensor connector.Does the display change to HIGH?Y NCheck the circuit from sensor pin 2 to PWB pin 8 for ashort circuit. If no problem is found, replace the PWB.Check the sensor installation and external lighting. If noproblem is found, replace the sensor.Check the sensor installation. If no problem is found, replace theSensor.Transmission Sensor fault FIPEnter Chain XX Func XXX in Diag (CE) mode. Block the sensor.Is HIGH displayed?Y NDisconnect the sensor connector.Does the display change to HIGH?Y NCheck the circuit from sensor pin 2 to PWB pin 8 for ashort circuit. If no problem is found, replace the PWB.Replace the sensor.Remove the block from the optical path of the sensor.Does the display change to LOW?Y NIs the voltage +5 VDC between the sensor pin 2 (+) andGND(-)?Y NCheck between the sensor pin 2 and PWB pin 8 foran open wire or poor contact. If no problem is found,replace the PWB.Is the voltage +5 VDC between the sensor pin 1(+) and pin3(-)?Y NCheck the wires between the PWB pin 4 and sensorpin 1and between the PWB pin 5 and sensor pin 3 foran open wire or poor contact. If no problem is found,replace the PWB.Check the sensor for contamination or installation fault. Ifno problem is found, replace the sensor.Check the sensor for an installation problem and the actuator fora bending or operation error.If no problem is found, replace the sensor.Switch (Normal Open) fault FIPEnter Chain XX Func XXX in Diag (CE) mode. Turn on theswitch.Does the display change to LOW?Y NIs the voltage +5 VDC between the swith pin 2 (+) andGND(-)?Y NCheck between the Switch pin 2 and PWB pin 3 for anopen wire or poor contact. If no problem is found,replace the PWB.When the switch is on, is the voltage +5 VDC between theSwitch pin 1(+) and GND?Y NReplace the switch.Check between the PWB pin 4 and switch pin 1 for an openwire or poor contact. If no problem is found, replace thePWB.Turn off the switch. Does the display change to HIGH?Y NDisconnect the switch connector.Is the display still HIGH?Y NCheck the circuit from the switch pin 2 to PWB pin 3for a short circuit. If no problem is found, replace thePWB.Replace the switch.Check the switch installation. If no problem is found, replace theswitch.