Service manual

1-2 AlphaServer GS160/320 CPU Addition and Removal
Who may service these systems?
Only those with appropriate technical training and experience should attempt
to service these systems.
What precautions are to be taken?
Table 1–2 lists the various power and mechanical hazards in the system.
Because these systems use a great deal of power, caution must be exercised
when servicing them. Remove all jewelry when working on the systems.
TheuseofESDstrapsisrequired. Wriststrapsarelocatedonthefrontand
rear doors of system cabinet 1 and on the rear door of the power cabinet.
Table 1–2 Hazards and Safety Features
Hazard Risks Safety Features Exposed Areas
AC power
Flashing metal
Shock
Death
AC only in the power cabinet
AC loads fully enclosed
Securely mated wiring system
None
48 VDC
power
Flashing metal
Welding of jewelry
➨ heat
Securely mated wiring system
48V isolated from cabinets
Covers
Current limit
QBB backplane
H-switch backplane
CPU module
Power modules
Low
voltage
power
Flashing metal
Welding of jewelry
➨ heat
Short circuit protection
Current limit
QBB backplane
H-switch backplane
Logic modules
Power modules
System
blowers
Severe cuts
Loss of fingers
Grill Exposed only when
lower system box out
PCI
enclosure
Low voltage power
hazard
Battery on
standard I/O
AC loads fully enclosed
Interlock
Under power supply
connector on the
backplane