Path: utzoo!utgpu!watmath!att!ucbvax!hplabs!hpfcdc!hpfcdj!dgrif
From: dgrif@hpfcdj.HP.COM (Dan Griffin)
Newsgroups: sci.electronics
Subject: Re: Fixing BSR modules...
Message-ID: <17660001@hpfcdj.HP.COM>
Date: 26 Jul 89 20:10:14 GMT
References: <189@flight.UUCP>
Organization: Hewlett Packard -- Fort Collins, CO
Lines: 24


  I just recently had this happen to me and I was able to successfully
replace the TRIAC (if you don't know what this is, take your X10 unit to
someone who does). :-) 
  The TRIAC is the only component in the unit that is exposed to any 
appreciable power levels, and it is directly in series with the light being 
controlled and the 120VAC mains. Therefore, a high current surge such as 
happens (sometimes) when a light bulb burns out will open or short the TRIAC. 
In my case the TRIAC shorted, so the light could not be controlled to the off 
state.  I purchased a generic replacement TRIAC from the local electronics 
store at a cost of about $3.00 (including tax). Be sure to get one that is 
rated to withstand 600 Volts in the off state and has an on current capability 
of at least 4 amps. The control (switching) current and voltage requirements 
are fairly loose. The original X10 modules were rated at 300 watts and had 
TRIACS that were really at the minimum margin for the application. (i.e. They 
would never stand up to the HP environmental stress test) :-)
  A little careful dissasembly and soldering iron work should put you back
in correct operation.

       Dan Griffin
       Hewlett Packard Company, Graphics Technology Division
       Fort Collins, Colorado  80525

  griffin%hpfcla@sde.hp.com