[Hai-users] Random System Resets. Please Help

[Bruce Schroeder]

I had written about this a while back. Got some good suggestions but 
still having trouble.

System:
HMS 1100 (OP II) version 2.8
3 expansion enclosures and one 16 zone exp. board
multiple outputs to relays
Serial connection to Lutron HWI
Serial to Crestron
TCP to PC Access, Weblink
Audio board
Added surge protectors a while back---before all of these problems

Problem:
Several distinct symptoms. Sometimes they happen together but other 
times in isolation without obvious precipitating cause.
1) System Reset. Shows in the event log
2) Loses communication with Crestron (Omnilink protocol). The inbound 
data LED is seeing the Crestron data but it stops sending data back to 
Crestron. Reboot (reset RAM) fixes temporarily
3) Sometimes, usually after one of the reset events, it loses the voice 
messages. Says "message 67" rather than "front door open"....
4) Had recurrent "fuse trouble" events--related to solid state fuse


We replaced the motherboard (a few times).  Interestingly the first new 
board was really messed up. It had an un-resettable solid state fuse 
trouble AND would not recognize the 16z expansion board. During the week 
that was in place we had NO resets or loss of Crestron comm's.

During troubleshooting found a smoke alarm relay that, when connected, 
caused the fuse trouble and when d/c'd was OK. Got rid of that relay and 
installed another new motherboard.

No fuse prob's but still had system reset, loss of voice and loss of comm's.

Replaced ALL power supplies to the system.

Had system reset and loss of comm's. No loss of voices (yet, only been 
12 hours since replaced power).

Where else can we look to troubleshoot? Anybody see anything like this 
before?

Thanks!!!!

Bruce