IBM 7940, Problem Determination And Service Manual

Page: 28 / 160

Table 2. Switch and jumper settings
Component
Default
value
Settings
NMI (nonmaskable
interrupt) switch (SW1) Off Pressing this button issues an NMI.
Boot block recovery
jumper (J51) 1 and 2
v Pins 1 and 2: Normal (default)
v Pins 2 and 3: Recover boot block.
BMC reset jumper (J36) Off Force BMC reset (trained service technician only).
When this jumper is installed, it causes a
continuous reset of the BMC.
Wake on LAN bypass
jumper (J48) 1 and 2
v
Pins 1 and 2: Wake on LAN disabled.
v
Pins 2 and 3: Wake on LAN enabled
BMC update jumper
(J34) Off Force BMC update (trained service technician
only). When this jumper is installed, it causes an
update of BMC firmware from ROM.
Force power-on jumper
(J37) Off Power-on override. When installed, this jumper
forces the server power on, overriding the
power-on button.
Power-on password
override jumper (J52) 1 and 2 Power-on (user) password override. Changing the
position of this jumper bypasses the power-on
password check the next time the server is turned
on and starts the Configuration/Setup Utility
program (see “Using the Configuration/Setup Utility
program” on page 15) so that you can change or
delete the power-on password. Move the jumper
back to the default position after the password is
overridden.
Changing the position of this jumper does not
bypass the administrator password check if an
administrator password is set.
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IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide