4-62 WorkCentre C2424 Service ManualExit Module (MEP) is Malfunctioning1. The exit module elevator does not raise and lower correctly.a. Is there scanner power supply working properly? Lift the document feederand observe the scanner lamps. If the lamps are on and the scanhead moves,the scanner power supply is supplying +24 volts.b. Check the exit module board LED’s, see "Scanner/Exit Module PowerSupply and MEP (Exit Module) Board" on page 10-8. Replace the exitmodule board if the LED’s do not light up.c. Lift the control panel and check for proper movement of the exit moduleelevator. Inspect the exit module for defective components. Replace anydefective components or the exit module assembly.System Fails to Power-UpPS, PE, and the 3.3 V indicator LEDs are not illuminated1. System is not receiving proper AC.CautionUse caution with hazardous voltages when diagnosing AC problems.The 3.3 V LED is located INSIDE the electronics module and must beobserved through the vent holes close to the AC power switch, see theillustration on page 4-71.a. Inspect the power cord.b. Verify AC outlet voltage and current capacities are within specifications.c. If necessary, move the system to a different outlet and retest.2. Disconnect the scanner assembly.3. Transient on AC line tripped protective circuitry in system power supply.a. Cycle power to system to reset protective circuits in power supply.4. Short circuit on 3.3 V power supply within the electronics module. ESD damageto the system may occur if static electricity is discharged to system electronicsa. With power cord connected, touch the metal electronics module to dischargeany static electricity.b. Turn off the system and wait 30 seconds for power supply capacitors todischarge. Damage to circuits within the electronics module may occur if thepower supply capacitors are not allowed to fully discharge.c. Unplug power cord and remove system covers, see "Covers" on page 8-8.CautionUse caution around motors, pulleys, and live AC connections when workingwith the system covers off. Disconnect the scanner cable from the electronicsmodule and power on the system.
