Supermicro 8042-6, User Manual

Page: 54 / 114

5-20
S
UPER
S
ERVER 8042-8/8042-6 Manual
5-10 Jumper Settings
Explanation of
Jumpers
To modify the operation of the
serverboard, jumpers can be
u s e d t o c h o o s e b e t w e e n
o p t i o n a l s e t t i n g s . J u m p e r s
create shorts between two pins
to change the function of the
connector. Pin 1 is identified
w i t h a s q u a r e s o l d e r p a d o n
the printed circuit board. See
the serverboard layout pages
for jumper locations.
N o t e : O n t w o p i n j u m p e r s ,
"Closed" means the jumper is
o n a n d " O p e n " m e a n s t h e
jumper is off the pins.
Connector
Pins
Jumper
Cap
Setting
Pin 1-2 short
3 2 1
3 2 1
SCSI Termination Enable/
Disable
The SCSI Termination jumpers
allow you to enable or disable
termination for the two SCSI
channels. The normal (default)
position is open to enable SCSI
termination. See the table on the
right for jumper settings.
Jum per
Position
Open
Closed
Definition
Enabled
Disabled
SCSI Termination
Enable/Disable
Jumper Settings
(JPA1, JPA2)
CMOS Clear
JBT1 is used to clear CMOS. Instead of pins, this jumper consists of con-
tact pads to prevent accidentally clearing the contents of CMOS.
To clear CMOS, 1) First unplug the power cord(s) 2) With the power discon-
nected, short the CMOS pads with a metal object such as a small screw-
driver 3) Remove the screwdriver (or shorting device) 4) Reconnect the
power cord(s) and power on the system.
Note: Do not use the PW_ON connector to clear CMOS.