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Showing content with the highest reputation on 11/02/24 in all areas
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BU1 is pin 1 on the blue plug. The transistors are divided into LE (lamp enable) and LD (lamp driver). LE switches to ground and LD switches to 34v. So LE transistors are on pins 1, 2, 3, 4, 5, 13 & 14. LD transistors are on pins 6, 7, 8, 9, 10, 11, 12 & 15. One other note on the diagram which I must admit I'd forgotten about says ...... 'Due to the overload sensing circuit, if a lamp or lamp holder goes short circuit none of the lamps in that row will light.' Hope that's useful.3 points
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Don't forget that if your 7 seg dispaly is OK then it's possible T14 and 15 are OK. Pin 15 (yellow) is Enable 3 on the 7 seg.1 point
