NEC POWERMATE ES 5250 - S, Руководство по обслуживанию

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2-2 System Boards
This section contains the connector, switch, and jumper setting information for
the following components of the PowerMate ES 5250 Series computers:
!
system board
!
SCSI adapter board
!
9.1-GB 7200 rpm Wide Ultra SCSI hard drive
!
18-GB 7200 rpm Wide Ultra SCSI hard drive.
For information on common components in the PowerMate ES 5250 Series of
computers, refer to the PowerMate ES 5200 Series Service and Reference
Manual.
System Board Jumpers
System board jumpers set system configuration for a particular requirement. The
system board has the following jumpers (jumper locations are shown in the
following figure).
Jumpers are set correctly at the factory for the system
configuration. Only change the appropriate jumper settings.
Otherwise, keep the jumpers at their factory settings.
!
Power On Jumper JP1 — sets the way the system starts up (jumper
correctly set at factory, do not change the factory setting).
!
CMOS Jumper JBAT1 — clears CMOS and resets the settings back to
their factory state.
!
VGA Mode Jumper JVGA1 — disables onboard video if adding a video
board to the system.
Note
:
The location of jumper JVGA1 on the PowerMate
ES 5250 system board (see the following figure) differs from
the location of jumper JVGA1 on the PowerMate ES 5200
system board.
!
CPU Bus Frequency Selector Jumper JK1 — selects 66-MHz or
100-MHz CPU bus frequency.
!
AGP Bus Frequency Selector Jumper JK2 — selects AGP bus frequency
or PCI bus frequency.
Jumper settings are described in the following paragraphs. For detailed
procedures on changing a system board jumper setting, refer to the PowerMate
ES 5200 Series Service and Reference Manual.