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D2 Powerhouse Earthquake amplifier. Power supply down.
D2 Powerhouse Earthquake amplifier. Power supply down.
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Old 12th June 2018, 01:46 AM   #1
rhempz01 is online now rhempz01  United States
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Default D2 Powerhouse Earthquake amplifier. Power supply down.

I have a D2 Powerhouse earthquake amplifier? It's a mono lock and it's power supply is down I have no gate drive at the mosfets. I do have a drive signal present at the ic. I can't seem to find it on any of the surrounding components? Anyone have experience repair this type of amplifier,?
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Old 12th June 2018, 02:19 AM   #2
Perry Babin is offline Perry Babin  United States
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You didn't say input or output of the IC.

If you have supply voltage on the driver IC and input to the IC, you should have output from the IC. From there, the gate resistors are the only things between the driver and the gates.
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Old 12th June 2018, 02:41 AM   #3
friendly1uk is offline friendly1uk  United Kingdom
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D2 Powerhouse Earthquake amplifier. Power supply down.
Would it drive the fets with no main rail voltage present? I realise it's not an out of balance situation, but it watches those missing DC voltages. Not present as the rectifier diodes have been removed.
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Old 12th June 2018, 02:59 AM   #4
Perry Babin is offline Perry Babin  United States
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There are amps that monitor the drive circuit but they typically shut down the PWM IC. Are you sure that this amp has such a circuit?
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Old 12th June 2018, 05:48 PM   #5
rhempz01 is online now rhempz01  United States
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Yeah that's what I tested both sides of the gate resistors and I don't know what the ic is I beleive it's a ka3525a, however that are defaced. I will post photos and reading from each leg of the ic.
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Old 12th June 2018, 05:53 PM   #6
Perry Babin is offline Perry Babin  United States
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See attached.
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Old 13th June 2018, 05:46 PM   #7
rhempz01 is online now rhempz01  United States
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I beleive this ic is functioning.
Pin
1. 51.3mv
2. 5.06v
3. 10mv
4. 102.2mv
5. 2.025v
6. 3.78v
7. 2.028v
8. 4.8v
9. 5.65v
10. 14.5mv
11. 6.21v
12. 0.2mv
13. 11.83v
14. 5.66v
15. 11.83v
16. 5.02v
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Old 13th June 2018, 08:49 PM   #8
Perry Babin is offline Perry Babin  United States
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The difference between 11 and 14 is more than I'd expect but it may be OK. If it was during the softstart time, that could explain the difference.
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Old 14th June 2018, 01:59 AM   #9
friendly1uk is offline friendly1uk  United Kingdom
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D2 Powerhouse Earthquake amplifier. Power supply down.
I'm without any sort of qualification, but find testing 11&14 for voltage tells me nothing. It's not meant to be a DC voltage, so finding one just seems to indicate a measurement error.



I say again.. I just learn about the things I need to fix, when I find the need. I test for frequency though. I would like to see 10s or hundreds of Khz. A sure sign it's trying to operate the fets. Amplitude is obviously important, but I use the AC scale for that. If I found the chip to be giving out DC, I would think it broke. Especially if both pins were DC and nicely balanced. Where is the AC in that?



It's rare that I tread on my own laces. Am I wrong?
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Old 14th June 2018, 02:05 AM   #10
Perry Babin is offline Perry Babin  United States
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Virtually no one who comes here has a scope so we're left to use what they have, a multimeter. Many multimeters have very limited bandwidth on AC and the readings at 20k+ can vary greatly. Not all meters have a frequency counter.

An example:
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