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Old 11th May 2012, 12:21 AM   #1
DREW028 is offline DREW028  United States
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Default earthquake 200dhc

I've got three of these amps with no ouput and look like they've been fixed before ( power supply for sure and near the input). Does anyone have a service manual?
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Old 11th May 2012, 01:06 PM   #2
DREW028 is offline DREW028  United States
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I probed the rca inputs and it seems im getting some kind triangular sine wave ( with out any actual inputs plugged in).


This thread will only refer only 1 of the 3 amp i have
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Old 11th May 2012, 01:27 PM   #3
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What were the scope settings?

It's probably just noise.
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Old 12th May 2012, 02:18 AM   #4
DREW028 is offline DREW028  United States
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.5v 20ms. I will post a screen shot if it helps. I am still learning about my scope.
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Old 12th May 2012, 03:53 AM   #5
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I don't think it's anything to be concerned about. Drive a signal into it and see where it stops.
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Old 12th May 2012, 04:36 AM   #6
DREW028 is offline DREW028  United States
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Well I took apart the amp completely and apparently who ever worked on this amp( major repairs have been done) broke the trace and installed a 15 amp fuse between the inductor and the output.


Should I replace with same fuse or fix the trace?? I'm guessing leave it but is 15 amp enough?

Last edited by DREW028; 12th May 2012 at 04:52 AM.
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Old 12th May 2012, 05:17 AM   #7
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The fuse size is generally printed near the fuse holder. For the best protection, you should use the lowest rated fuse that doesn't blow under normal operating conditions.

If the trace was burned, you need to repair it. Sometimes, traces are cut at the factory but it's relatively rare.
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Old 12th May 2012, 01:30 PM   #8
DREW028 is offline DREW028  United States
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Just to be clear the fuse was installed between the + speaker terminals and the inductor.
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Old 12th May 2012, 07:12 PM   #9
DREW028 is offline DREW028  United States
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One or both of the transformers have a buzz to them. That could be the noise on the inputs?
Is this likely cause by the transformer or something causing the transformer to do this.
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Old 13th May 2012, 02:32 AM   #10
DREW028 is offline DREW028  United States
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Click the image to open in full size.


On this amp someone added that board to the ic. Also added caps and resistors in parallel to the circuit. One of the other amps has the added caps but not the board or resistors.

Last edited by DREW028; 13th May 2012 at 02:35 AM.
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