Compaq AlphaServer DS20 Manual de Serviço Página 42

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1-32 AlphaServer DS20 Service Manual
1.12
Power Up/Down Sequence
System power can be controlled manually by the On/Off button on the OCP or
remotely through the RCM. The power-up/down sequence flow is shown below.
Figure 1-17 Power Up/Down Sequence Flowchart
Apply AC
Power
Vaux on
Assert
DC_ENABLE_L
Power Supply
Starts
Disable Outputs
Deassert POK
Assert
SHUTDOWN
30 Second
Delay
Assert
POK
On-Off Button
RCM Enable OK
Interlock OK
On-Off Button
DC_ENABLE_L
On-Off
Button
Any
Faults
Fan/Temp
OK
On
On
Off
Off
Ye s
No
On
Off
No
Ye s
PK1409-99
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