Supermicro SuperServer SYS-221H-TNR - Page 85

85
Chapter 4: Motherboard Connections
UID LED and System_Reset Button Select Jumper
Jumper JRU1 is used in conjunction with pin 2 of Front Control Panel header 1 (JFP1) to
function as a System_Reset button or a UID LED button. To congure pin 2 of JFP1 for front
UID button use in a chassis that supports front UID connection, close pins 1 and 2 of jumper
JRU1. To set pin 2 of JFP1 for system reset support, close pins 3 and 4 of jumper JRU1.
Refer to the table below for more information on JRU1. Also refer to the motherboard layout
in Chapter 1 for the location of JRU1.
Front UID Switch/Reset Button Select Jumper (JRU1)
Jumper Settings
State Description
Close Pin 1 and Pin 2 of JRU1 Pin 2 of JFP1: used for front UID switch support
Close Pin 3 and Pin 4 of JRU1 Pin 2 of JFP1: used for System Reset support
CMOS Clear
JBT1 is used to clear CMOS, which will also clear passwords. Instead of pins, this jumper
consists of contact pads to prevent accidentally clearing the contents of CMOS.
To Clear CMOS
1. First power down the system and unplug the power cord(s).
2. Remove the cover of the chassis to access the motherboard.
3. Short the CMOS pads, JBT1, with a metal object such as a small screwdriver for at
least four seconds.
4. Remove the screwdriver (or shorting device).
5. Replace the cover, reconnect the power cord(s), and power on the system.
Note 1: Clearing CMOS will also clear all passwords.
Note 2: Do not use the PW_ON connector to clear CMOS.
BMC and PCH I²C/SDA to VRM and BMC and PCH I²C/SCl to VRM Select Jumper
Use jumper JVRM1 to select between BMC and PCH I²C/SDA for VRM support or BMC and
PCH I²C/SCl for VRM support. Connect a cable to JVRM1 to enable BMC and PCH I²C/SDA
for VRM support. See the table below for jumper settings.
BMC and PCH I²C/SDA to VRM and BMC and PCH I²C/SCL to VRM Select Jumper
Jumper Settings
Jumper Setting Denition
Closed BMC and PCH I²C/SDA for VRM support (Default)
Open BMC and PCH I²C/SCl for VRM support