I killed my 388!

  • Thread starter Thread starter Gavin137
  • Start date Start date
trying again with the picture
 

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OK on the left side of the picture, which is toward the rear of the board you can see discoloration around the leg of the resistor.
 
Update #2 SUCCESS!

I had to put the 388 on the back burner for a while, however proceeding on the idea that the control board could be the problem I was able to find another one from the guy I mentioned earlier in the thread. It just arrived today, installed and -PRESTO, the 388 is functioning perfectly again.

Now I am back to where I started, which was wanting to install led lighting in the vu's.

I have learned that you have to be REALLY careful when you disassemble something electronic to watch those screws! It was just one little screw falling into the works that caused this whole headache.
 
Also once I got the control board out I was able to see that that big resistor was totally burned, as was the circuit board all around it, so that was definitely at least a large part of the problem.
 
All's well that ends well.

The 388 lives again! And the new lights look even better than I thought they would. Thanks to those of you who pointed me in the right direction,\ and helped me get this thing figured out.
 

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nice to hear that you made it out. What LED's did you use to replace the lamps ? i have replaced lamps with lamps but not LEDs as they dont have a nice pattern and also require a big resistor to drop the voltage from 18V so they heat up a lot. Can you take a close picture of the VU meters to see how the light looks on it ? and also post the LED info ?

thanks
 
Strange - my schematic has it at 6V, though my meter said it was more like 8. They are item # LED-12W 12 V white diffused LED, 5MM from All Electronics. 12V WHITE DIFFUSED LED, 5MM (T1 3/4) | AllElectronics.com The pattern is not as spread out as a bulb, but still more diffused than most of the LEDs I tried. One could probably sand the ends to diffuse them more. Best part is they have built in resistor, and will work with 4-12 volts. I had to cut out the little plastic bump in the meter lens to get the LED to fit, and it has to sit pretty low to not be visible. My only complaint is that I imagine I can see them flickering because they're running on AC. Overall very pleased with the result.
 

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Nicely done! Yeah I thought about yellow, as these LEDs come in a variety of colors, but ultimately I decided I wanted a "future of retro" vibe and went with white. I was pleased that the white came out with a bluish tint.
 
i was thinking to maybe use two in series, as they will vary the light intensity with voltage. I prefer them not that bright, will try it on my MS16 and post pictures.
 
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