
ACP-4320 User Manual 26
The alarm board is located under the system fan. It makes an audible alarm when:
! Any power supply module of the redundant power supply fails
! One of the cooling fans fai1s
! Internal temperature of the chassis is too high
To stop the alarm beep, simply press the Alarm Reset button on the front panel.
5.1 Alarm Board Layout
The layout and detailed specifications of the alarm board are given below:
Figure 5.1 Alarm board layout
5.2 Alarm board specifications
Input Power: +5V, +12V
Input Signals:
! 7 fan connectors
! One thermal sensor connector (connects up to 8 thermal sensors in series)
! One Power Good connector
! One alarm reset connector
! One voltage signal connector (connect from the backplane / motherboard, sup-
porting six voltages: +-12 V, +-5 V, +3.3 V and +5 Vsb)
! One HDD LED connector (connect from the CPU card/motherboard)
Output Signals:
! One LED board connector
! One Buzzer output
5.2.1 Connectors, Jumper and Pin Definition
Table 5.1: Summary of the connectors, jumper and pin definition
CN1: External power connector, standard mini 4-pin power connector
Pin 1 +12V @ 2A max. Pin 2
GND
Pin 3 GND Pin 4
+5V @ 2A max
CN4: Thermal sensor (LM75) connector
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