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Trisha

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Posts posted by Trisha

  1. On 3/4/2021 at 9:06 PM, Lobo Exp said:

     If you can post a photo of the side of the board with the traces, may be both sides have traces. I can tell you for certain if the photo is clear enough. I have a board for the old classic in kit form from across the Atlantic I am working on. There should be a Voltage regulator for the board, it has 3 large flat leads, the center lead is the negative terminal, also tied to the heat sink, which should lead to a wide trace that boarders the PCB. The black wire goes to the center lead. The red wire will go to the trace that leads to the end of a diode(opposite end from the white band if the diode is black) with no other traces going anywhere except to the diode unless there are wires going to the on/off switch. The diode will have a white band on one end which will lead to the regulator power in, the V reg has a heat sink tab with a hole. This part and the diode should be very close to each other. I have never seen a clear photo of an ST board but that shouldn't matter. The schematics for particular components sections are basically the same up to a point. The power supply design is a standard and the only thing that changes is placement and maybe a few extra components depending on how much polarity protection and filtering capacitors are included. The diode is there to keep from blowing out components in case the battery is connected backwards, which is usually pretty hard to do with polarized connections. It should be rated for at least 1 amp which is not much but that is in forward bias, reverse bias is much more.  However anything can be done if you try hard enough like putting the batteries in a holder backwards, it has been done before and touching the battery connector in reverse even for a split second will burn out the circuit parts. I know this gets to sounding like you may not know much about electronics from my end. I don't have any knowledge of how much you do know so I am trying to make this as clear as possible. Again, if you take a good close up photo of both sides of the circuit board it would be a big help but that may be a tough one with all the other wires on the board. You don't mention the model of the detector and schematics seem to be a hard thing to find most of the time for any of the detectors. If this helps, then your are set to repair your unit. 

     

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