Electronics > Repair
Voltage Increase, failed component?
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fzabkar:
I think I would be breaking out the scope and looking for step pulses. Start with a working unit and then compare with yours.

I'm wondering how your high supply voltage observation relates to this fault. Can it really be significant, or is it a red herring? The only explanation I can think of is that the supply is unregulated, and the fault is unloading it in some way. I suspect that if you examine the power supply circuit, you will find that the 12V rail is regulated while the 28V rail just finds its level via the turns ratio in the transformer.

Is it possible that the light is stuck in a program where pan and tilt are disabled???
ajp8868:
Yeah I'm going to try and get hold of a scope. I've never used one for repairs before but I think it's about time! Where should I be probing? Direct from the micro controller?

I tried probing the oscillator on a working unit with my DMM on frequency mode, but it made the light act crazy. Is there a way to do that properly?

It could be a red herring, but that supply doesn't do it on a working board..

It's a good thought but it doesn't have any functions where the pan/tilt could be disabled and even then it would at least perform it's startup routine.
shakalnokturn:

--- Quote from: fzabkar on July 29, 2024, 07:14:03 am ---I think I would be breaking out the scope and looking for step pulses. Start with a working unit and then compare with yours.

--- End quote ---

If you have access to a thermal camera that would also be of great help for comparison.


--- Quote from: fzabkar on July 29, 2024, 07:14:03 am ---The only explanation I can think of is that the supply is unregulated, and the fault is unloading it in some way. I suspect that if you examine the power supply circuit, you will find that the 12V rail is regulated while the 28V rail just finds its level via the turns ratio in the transformer.

--- End quote ---

I was thinking of this too. Excessive loading on the regulated rail would bring the unregulated one higher than intended, so there again look for anything running hot.
ajp8868:
I've tried with electronics freeze spray which doesn't seem to show anything obvious sadly.

I don't have access to a thermal camera unless I can rent one but even then it's quite expensive.

I'll keep looking to see if there's anything I can feel getting hot. Do you think possibly a short on the 12v side? Everything seems to be working fine on that side.
themadhippy:
The most common fault on nodding buckets is broken wires in the arms,presume you've tested continuity whilst wiggling the wires
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