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PostPosted: Mon Mar 13, 2017 7:02 pm 
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I built a mk127 microbug kit. The problem I am having now is that one of the motors doesn't turn on and one of the leds (the one on the other side of the motor that isn't working) doesn't turn on. How do I go about debugging this? Here is a picture of the board:

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PostPosted: Mon Mar 13, 2017 7:07 pm 
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Check the transistors.
T1 and T3 = BC547
T2 and T4 = BC557


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PostPosted: Mon Mar 13, 2017 7:10 pm 
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Wrong Way wrote:
Check the transistors.
T1 and T3 = BC547
T2 and T4 = BC557


The transistors are in the correct spots


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PostPosted: Mon Mar 13, 2017 7:20 pm 
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It turns out one of the motors wasn't working because the pots was turned all the way down -_-...... I wish it was more clear in the directions was the pots did..... I still can't figure out whats wrong with the LED.. Is there an easy way to check if it's in backwards? I feel like if one of the leds was on backwards everything after it is the circuit wouldn't work


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PostPosted: Mon Mar 13, 2017 8:44 pm 
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It is possible that the one that is not working is backwards.
Look at the print on the board you will notice that there is a flat spot (Negative)
Now look through the side of the LED that works.
You will notice a flag in it.
Now look at the direction the flag is pointing in relation to the flat spot on the board.
Check to see if the one that is not working is pointing the same way as in relation of the flat spot.

I hope you understand what I am trying to say.


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PostPosted: Mon Mar 13, 2017 11:29 pm 
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Wrong Way wrote:
It is possible that the one that is not working is backwards.
Look at the print on the board you will notice that there is a flat spot (Negative)
Now look through the side of the LED that works.
You will notice a flag in it.
Now look at the direction the flag is pointing in relation to the flat spot on the board.
Check to see if the one that is not working is pointing the same way as in relation of the flat spot.

I hope you understand what I am trying to say.


Sweet this was the problem. I accidently detached the solder pad while removing the led though. Is there a way to reattach the solder pad to the board?


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PostPosted: Tue Mar 14, 2017 2:07 pm 
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You can scrape some of the green coating off of the trace (carefully) and make a solder bridge to the leg of the LED.
You can also lower the LED so some of the leg of the LED is sticking through.
Bend it over to the trace and solder it.


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