User manual

ACP-2320MB User Manual 26
The alarm board is located under the internal disk drive housing. The alarm module
provides system detection functions that monitor the entire status of the computer
system, including: thermal conditions, fans, power supply and HDD operation. Any
problems with the system are reported through audible alarms and LED indicators.
The alarm board makes an audible alarm when:
a. Any power supply module of the redundant power supply fails.
b. One of the cooling fans fails.
c. The temperature inside the chassis is too high.
To stop the alarm beep, simply press the Alarm Reset button and then take the nec-
essary action to fix it.
5.1 Alarm Board Layout
The layout and detailed specification of the alarm board are given below:
Figure 5.1 Alarm board layout
5.2 Alarm Board Specifications
! Input Power: +5 V, +12 V
! Input Signals:
– 7 fan connectors
– One ‘thermal sensor’ connector (supports up to 8 thermal sensors in series)
– One ‘power good’ input
– One ‘alarm reset’ input
– One ‘voltage signal’ connector (connect from the motherboard, supporting six
voltages: ±12 V, ±5 V, +3.3 V and +5 Vsb)
– One ‘hard disk LED’ connector (connect from the motherboard)
! Output Signals:
– One ‘LED board’ connector
– One ‘buzzer’ output