4-6 
3-slot or MPM module 
rack communication 
board failure   
Replace the 3-slot or MPM module rack communication 
board. 
Nios II module failure  Replace the Nios II module. 
Mother board failure  Replace the mother board. 
 
4.6.4 Alarm Problems 
Symptoms   Possible Cause  Corrective Action 
Cable defective or 
poorly connected 
1. Check that cables from alarm LED board to 
button board and button board to mother board 
are properly connected. 
2. Check that connecting cables and connectors 
are not damaged. 
Alarm LED board 
failure 
Replace the alarm LED board. 
Button board failure  Replace the button board. 
The alarm lamp is 
not light or 
extinguished but 
alarm sound is 
issued   
Mother board failure  Replace the mother board. 
Audio alarm disabled 
Select [Main Menu]→[Maintenance >>]→
[User Maintenance >>]→enter the required 
password→[Alarm Setup >>], and then in the 
popup menu, set [Minimum Alarm 
VolumeAlm S ound ] to appropriate setting.[On] 
In the [Others] window of the [Alarm Setup] 
menu, set [Alm Volume] to appropriate setting. 
Cable defective or 
poorly connected 
1. Check that cable between speaker and mother 
board is properly connected. 
2. Check that connecting cables and connectors 
are not damaged. 
FPGA audio logic error 
Upgrade the audio logic part of the FPGA 
program. 
Speaker failure  Replace the speaker. 
No alarm sound is 
issued but alarm 
lamp is light   
Mother board failure  Replace the mother board.