78
Chassis SC743 User's Manual
*The buzzer sound indicates that a condition requiring immediate attention has
occurred.
The buzzer alarm is triggered by the following conditions:
1. Hard drive failure
2. System temperature over 50º Celsius.
Socket Settings
Jumper
Setting
Note
JP18
Open: No Reset (Default)
Closed: Reset
Buzzer reset*
JP25
Open: 45
º C
1-2: 50º C (Default)
2-3: 55º C
Overheat temperature setting.
Figure E-2. Front Jumpers
Explanation of Jumpers
To modify the operation of the backplane, jumpers can be used to choose between optional
settings. Jumpers create shorts between two pins to change the function of the connector. Pin
1 is identified with a square solder pad on the printed circuit board. Note: On two pin jumpers,
"Closed" means the jumper is on and "Open" means the jumper is off the pins.
Connector
Pins
Jumper
Setting
3 2 1
3 2 1
E-7 Front Jumper Locations and Pin Definitions
+12V
+12V
GND
GND
GND
GND +5V
+5V
48
1
16
64
49
H7
H5
H3
MM2
SATA743
REV 3.00
R
S
UPER
pb
#1
#0
#2
#3
#4
#6
#5
#7
ACT IN
OH LED
JP10
JP13
JP25
JP26
JP18
JP35
BZ1
JP18: BUZZER RESET
JP35: GEM24 RST
JP25: OH TEMP.
OPEN 45 C
1-2 50 C
2-3 55 C
JP18
JP25
