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   sci.electronics.repair      Fixing electronic equipment      124,925 messages   

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   Message 123,031 of 124,925   
   David Farber to All   
   Scumacher 1042A-PE battery charger has n   
   19 Aug 22 19:39:03   
   
   From: farberbear.unspam@aol.com   
      
   This Schumacher 1042A-PE battery charger stopped functioning today. It   
   seemed to work for a little while but when I noticed the car battery's   
   voltage wasn't slowly increasing after performing a 2 amp charge for 2   
   hours, I checked the voltage at the charger's cables and it was 0 volts.   
   The continuity of the switches and cables were all good. I did find a   
   power semiconductor which I could not identify, BTW70-200SN. I looked in   
   an old ECG cross-reference book and the closest match was for a   
   BTW69-800 which is an SCR in a TO-218 package. The package seems to   
   match the device I'm looking for. I made some measurements with my   
   Simpson 464 DVM on the 2k ohm scale. Pins 1 and 3 measure 38 ohms   
   regardless of test lead polarity.  All other combinations of continuity   
   measure open circuit. In circuit, pins 1 and 2 are soldered together.   
   Any idea what this component is or how to test it?   
      
   Thanks for your reply.   
      
   David Farber   
   Los Osos, CA   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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