HELP! My remote volume control stopped working! :( - diyAudio
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Old 14th October 2006, 01:24 AM   #1
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Default HELP! My remote volume control stopped working! :(

I built this kit from Altronics and it worked fine for about half an hour, then just stopped, the lights to indicate a signal received don't operate.

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http://www.altronics.com.au/index.as...=item&id=K5026

I know my mistake, but don't know how to fix it. It requires 12 - 15V and by wiring the power supply incorrectly, I was feeding it 30V! Oooops!

Looking at the board, there are no signs of damage. I have taken my multimeter and tried to find any obvious signs of components that are fried, by measuring the resistance across all the resistors, and the motor itself. I can't find anything.

Can anyone suggest how I might find the problem and fix it?

Edit:

Here are the images:

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Old 14th October 2006, 01:41 AM   #2
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My best guess is the controller chips are
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Old 14th October 2006, 01:47 AM   #3
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maybe just the regulator . Does anything work ie LED's......
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Old 14th October 2006, 01:47 AM   #4
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How would I determine this? I don't want to randomly buy and replace parts as I could spend the cost of the kit and not fix it. Or maybe even damage parts in the process.

LEDs don't light up now, however whether they still work is another thing. Can I test them with a multimeter?
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Old 14th October 2006, 01:55 AM   #5
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Inspect if you have 5 Volts at the output of the regulator and also inspect the 100 uF capacitor at the input of the regulator , this capacitor has only 25 volts ratings and can be destroyed by the 30 Volts input voltage...
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Old 14th October 2006, 01:57 AM   #6
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Did your 30 volt supply blow a fuse ? I'd also take a good look at the input elect cap it was only rated for 25 vdc.
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Old 14th October 2006, 02:02 AM   #7
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5 volts at output of regulator with the proper voltage applied
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Old 14th October 2006, 02:08 AM   #8
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There are no fuses to blow. The power supply comes from an ESP preamp power supply.

Regarding checking caps, is it sufficient to just measure capacitance with my DMM?
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Old 14th October 2006, 02:14 AM   #9
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Put a 200 Ohms resistor for protection and to bring the input voltage down ,in series with the positive input of the regulator and inspect the voltages first...
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Old 14th October 2006, 02:16 AM   #10
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Does it appear to have gotten warm or hot ie shrunken plastic or bulged or expanded about allyou can tell is if it is shorted or not .
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