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Old 1st February 2013, 02:37 PM   #31
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You touch the scope probe to the primary windings (set it to 10us and 10v/div). I'm assuming that the scope is grounded to the 12v power supply. If not, the scope ground will go to the amp ground. You should see the 24v of swing on the outer primary windings or the center legs of the FETs driving those windings.
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Old 1st February 2013, 02:48 PM   #32
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I hear a small hum coming from that transformer, and I do see a swing. It changes pitch as I wiggle it.
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Old 1st February 2013, 02:51 PM   #33
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How does it compare to the other 3 transformer primary windings?
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Old 1st February 2013, 02:53 PM   #34
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All have the same amplitude, some just start climbing at slightly different points
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Old 1st February 2013, 02:58 PM   #35
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These are the 4 windings for the 2 transformers closest the driver card. They have the small windings for the 15v and I think 12v or some other lines (the other transformer).

The first two are from the 15v one.
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Old 1st February 2013, 03:03 PM   #36
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Touch the scope probe to pin 9 or 10 of the driver IC for the power supply with the scope set to 5v/div and post the photo.
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Old 1st February 2013, 03:09 PM   #37
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this is what I see
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Old 1st February 2013, 03:15 PM   #38
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Is your timebase multiplier set to 10x?

If it is, set it to 1x.
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Old 1st February 2013, 03:24 PM   #39
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Yes I did, lol.
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Old 1st February 2013, 03:28 PM   #40
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The amplitude appears to be too low. Is the scope set to 5v/div?
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