3Com NETBuilder II Installing Instruction

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3Com NETBuilder II Installing Instruction Manual pdf 39 page image

Maintenance and Repair 2-11Maintenance andRepairThis section includes maintenance and repair information for the 8-Slot chassis.Preventive Maintenance 3Com recommends the following procedures for preventive maintenance:n Observe the environmental requirements listed in Appendix A. Temperaturesoutside the recommended range can impair reliability and cause disketteaccess errors.n Observe ESD guidelines whenever handling modules.n Keep the area around the NETBuilder II system clean. Avoid accumulateddust, especially around the air intake vents.n If the system fails, an immediate memory dump may help diagnose theproblem. Contact 3Com Technical Support for memory dump information.Replacing thePower SupplyIf any component other than the fuse fails in the power supply, you mustreplace the entire power supply.You will need a Phillips screwdriver that fits a #6-32 screw.To replace the power supply in the 8-Slot chassis, follow these steps:WARNING: Do not open the power supply. It contains hazardous voltages.There are no user-serviceable parts inside.VORSICHT: Öffnen sie niemals das Netzteil. Hochspannung! Es sind keine zuwartenden Teile enthalten.AVERTISSEMENT: Ne pas ouvrir ce bloc d’alimentation. Tensions dangereusesà l’intérieur. Ne contient aucune pièce que l’utilisateur puisse rèparer.PELIGRO: No abra fuente de alimentación. Contiene alta tensión. No hay partespara reemplazar adentro.1 Turn off the system and unplug the power cord from the outlet and from thepower supply.It is not necessary to take your chassis out of the rack if it is rack-mountedbecause the power supply can be removed from the back panel.2 Remove the six screws that secure the power supply module to the back of thechassis.3 Grasp the handle on the power supply module and pull it out of the chassis.You may feel a slight resistance as the power supply connector disconnects fromthe backplane.4 Slide the new power supply into the chassis and press it firmly to make sure thepower supply connector engages the backplane connector.5 Reinstall the six screws to secure the new power supply module in the chassis.6 Make sure the power switch is off (O is pressed down). Plug the power cordinto the power supply and the outlet.7 Turn on the system.