Maintenance And Repair; Preventive Maintenance; Replacing A Power Supply - 3Com NETBuilder II Installing Instruction

1-10 C 1: NETB
HAPTER UILDER
Maintenance and
Repair

Preventive Maintenance

Replacing a
Power Supply
II 4-S B /R
LOT RIDGE OUTER
This section includes maintenance and repair information for the 4-Slot chassis.
3Com recommends the following procedures for preventive maintenance:
Observe the environmental requirements listed in Appendix A. Temperatures
outside the recommended range can impair reliability and cause diskette
access errors.
Observe ESD guidelines whenever handling modules.
Keep the area around the NETBuilder II system clean. Avoid accumulated
dust, especially around the air intake vents.
If the system fails, an immediate memory dump may help diagnose the
problem. Contact 3Com Technical Support for memory dump information.
If any component other than a fuse fails in the power supply, you must replace
the entire power supply.
You will need two Phillips screwdrivers: one that fits a #10-32 screw (to remove
the system from the rack) and one that fits a #6-32 screw (to remove and
replace the cover and the power supply).
To replace the power supply in the 4-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 zu
wartenden Teile enthalten.
AVERTISSEMENT: Ne pas ouvrir ce bloc d'alimentation. Tensions dangereuses
à l'intérieur. Ne contient aucune pièce que l'utilisateur puisse rèparer.
PELIGRO: No abra fuente de alimentación. Contiene alta tensión. No hay partes
para reemplazar adentro.
1 Turn off the system and unplug the power cord from the outlet and the
power supply.
2 If your system is mounted in a rack, remove it from the rack and remove the
rack-mount brackets from the chassis.
3 Remove the cover from the chassis.
a Remove the screws from the back and sides of the chassis.
b Slide the cover toward the back of the chassis and lift it off.