---------------------------------------------------------- Avionics-List Digest Archive --- Total Messages Posted Sun 06/10/07: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:46 PM - SPA-400 intercom (Bob Vandegrift) 2. 08:43 PM - Re: SPA-400 intercom (Doug McNutt) ________________________________ Message 1 _____________________________________ Time: 07:46:37 PM PST US From: Bob Vandegrift Subject: Avionics-List: SPA-400 intercom I have fried several resistors/diodes (don't ask, lets just say the previous professional approved installation choice of protection had something to do with it) in the unit to the point I can not tell what they are or their values. There is a cluster of 4 passives, a diode, capacitor, ? and ? located just behind the on/off switch on the board. Anyone out there have access to a schematic or and old unit to help me determine what they are. They will be easy to replace and repair the unit. Thanks Bob ________________________________ Message 2 _____________________________________ Time: 08:43:52 PM PST US From: Doug McNutt Subject: Re: Avionics-List: SPA-400 intercom At 22:43 -0400 6/10/07, Bob Vandegrift wrote: > I have fried several resistors/diodes (don't ask, lets just say the previous professional approved installation choice of protection had something to do with it) in the unit to the point I can not tell what they are or their values. There is a cluster of 4 passives, a diode, capacitor, ? and ? located just behind the on/off switch on the board. Anyone out there have access to a schematic or and old unit to help me determine what they are. They will be easy to replace and repair the unit. >Thanks >Bob I have a schematic and installation sheet for a Sigtronics SPA-400. It's pretty old - earlier than 1885 or so. I'll see if I can scan it in the morning but it's not going to be a work of art. There is no parts layout drawing in the stack. If you can identify some part numbers on the PC board I might be able to come up with values. -- --> The best programming tool is a soldering iron <-- ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message avionics-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Avionics-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/avionics-list Browse Digests http://www.matronics.com/digest/avionics-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.