What's the problem with the fire alarm controller JB-QB-LD128 showing a common fault light?
The external bus from the host to fold, later to see if the host is reset also bus fault, if not daily, that the motherboard is no problem, check the line bus short circuit can be excluded. If the outside line is broken, the host or report is the main board is bad, need to repair or replace the motherboard!
If there is a peripheral fault, electrical failure, Lida public fault lights will be bright, only the actual solution of the external fault, the public will be eliminated
Two causes can cause bus failure:1) the motherboard is bad2) bus short circuit
