NEC POWERMATE ES 5250 - S, Руководство по обслуживанию

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System Boards 2-5
Setting AGP Bus Frequency Selector Jumper JK2
The AGP bus frequency selector jumper JK2 sets the AGP bus frequency to
66 MHz when pins 1 and 2 are jumpered. Removing the jumper from pins 1 and
2 sets the AGP bus to the PCI bus frequency (see the following table for
settings).
AGP Bus Frequency Selector Jumper JK2 Settings
JK2 Pins Function
1-2 Jumpered Factory setting. Sets the AGP bus frequency to 66
MHz.
1-2 Not Jumpered Sets the AGP bus frequency to the PCI bus
frequency.
SCSI Adapter Board Connectors and Jumpers
The build-to-order Adaptec 2940U2W Ultra2 Wide SCSI adapter board is
installed in one of the PCI expansion board slots in the system.
The board has four connectors:
!
68-pin high density Ultra2 Wide SCSI internal connector
!
68-pin high-density Ultra2 Wide SCSI external connector
!
68-pin high density Ultra Wide SCSI internal connector
!
50-pin high density Ultra SCSI internal connector.
For systems with the SCSI adapter board and SCSI hard drive, one end of the
factory installed SCSI interface ribbon cable connects to the 68-pin high density
Ultra2 Wide SCSI internal connector on the SCSI board. The other end connects
to the internal SCSI hard drive.
The SCSI adapter board has no switches or jumpers to set. The SCSI IDs and
terminations are normally set by jumpers on the SCSI hard drive (see “Hard
Drive Connectors and Jumper Settings” in this section). Settings can also be set
through the factory installed Adaptec SCSISelect
™
software. All SCSI settings
are preset at the factory, including SCSI IDs and terminations.
All SCSI adapter board software settings are correctly set at
the factory for the system configuration. Do not change the
settings. Doing so may disable the adapter board, hard
drive, or both.