IBM 865511Y Hardware Maintenance Manual - Page 147

System board switches, System Board Removal., Table 4. System Board Switch Block

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System board switches The following table provides the system switch identifiers and descriptions of these switches. The system switch block is identified by key 13 in the illustration at "Identifying parts on the system board" on page 80. Note Turn off the server and disconnect the power cord before moving any switches. Table 4. System Board Switch Block Identifier 1 2 Switch Description Reserved Reserved 3 Reserved 4 Reserved 5 BIOS recovery mode. When this switch is set to On, perform BIOS recovery using the boot block (boot block recovery). The recovery boot block is in a protected area of flash memory that cannot be overwritten. When the BIOS becomes corrupted (for example, if a power failure occurs during a flash update), the recovery boot block can be used to restore the BIOS. The code in the recovery boot block enables the server to start up and read a flash diskette. The flash utility automatically recovers the system BIOS from the BIOS recovery files on the diskette. When the flash is complete, the switch must be moved to the Off position. The default setting is Off (disabled). 6 Ethernet operation mode. When this switch is set to On, the onboard Ethernet controller is disabled. When this switch is set to Off, the onboard Ethernet controller operates normally. The default setting is Off. 7 Administrator password locked. When this switch is set to On, the administrator password is unlocked, and may be changed or reset although enhanced security is enabled. When this switch is set to Off, the administrator password is locked, and may not be changed or reset if enhanced security is enabled. The default setting is Off. 8 Diskette write protection. When this switch is set to On, prevent writing to diskette. When this switch is set to Off, normal diskette read and write operation is in effect. The default setting is Off. System Board Removal. To remove the system board. do the following. 1. Disconnect the cables and remove the side cover, see "Preparing to install and remove options" on page 73 and "Disconnecting cables and removing the cover" on page 74. 2. Remove the air baffle, see "Accessing the system board" on page 82. Netfinity 8655 - Type 8655 139

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System board switches
The following table provides the system switch identifiers
and descriptions of these switches.
The system switch
block is identified by key
±13²
in the illustration at
“Identifying parts on the system board” on page
80.
Note
Turn off the server and disconnect the power cord
before moving any switches.
Table 4. System Board Switch Block
Identifier
Switch Description
1
Reserved
2
Reserved
3
Reserved
4
Reserved
5
BIOS recovery mode.
When this switch is set to On,
perform BIOS recovery using the boot block (boot block
recovery).
The recovery boot block is in a protected area of flash
memory that cannot be overwritten.
When the BIOS
becomes corrupted (for example, if a power failure
occurs during a flash update), the recovery boot block
can be used to restore the BIOS.
The code in the
recovery boot block enables the server to start up and
read a flash diskette.
The flash utility automatically
recovers the system BIOS from the BIOS recovery files
on the diskette.
When the flash is complete, the switch
must be moved to the Off position.
The default setting is Off (disabled).
6
Ethernet operation mode.
When this switch is set to On,
the onboard Ethernet controller is disabled.
When this
switch is set to Off, the onboard Ethernet controller
operates normally.
The default setting is Off.
7
Administrator password locked.
When this switch is set
to On, the administrator password is unlocked, and may
be changed or reset although enhanced security is
enabled.
When this switch is set to Off, the
administrator password is locked, and may not be
changed or reset if enhanced security is enabled.
The default setting is Off.
8
Diskette write protection.
When this switch is set to On,
prevent writing to diskette.
When this switch is set to
Off, normal diskette read and write operation is in effect.
The default setting is Off.
System Board Removal.
To remove the system board. do the following.
1.
Disconnect the cables and remove the side cover,
see “Preparing to install and remove options” on
page
73 and “Disconnecting cables and removing the
cover” on page
74.
2.
Remove the air baffle, see “Accessing the system
board” on page
82.
Netfinity 8655 - Type 8655
139