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Old 3rd December 2012, 06:42 AM   #91
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Leave it directly connected to the supply but connect it to a speaker or dummy load and post a photo of the defective channel driven to clipping.
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Old 3rd December 2012, 09:43 AM   #92
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I cant it maxes out my power supply before the signal clips.

When I get to about 1/4 volume I am drawing 60 amps thats all my supply has, it kicks my supply into protect.
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Old 4th December 2012, 06:29 AM   #93
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Did you get a chance to read post #92?

Maybe I am connecting the load to the amp improperly?
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Old 4th December 2012, 06:34 AM   #94
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You connect it to the speaker terminals like you would a speaker. You only need to load the distorted channel. It doesn't need to be a 2 ohm load. It can be a 4 or even an 8 ohm load.
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Old 4th December 2012, 07:38 AM   #95
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Quote:
Originally Posted by Perry Babin View Post
You connect it to the speaker terminals like you would a speaker. You only need to load the distorted channel. It doesn't need to be a 2 ohm load. It can be a 4 or even an 8 ohm load.
Thats how I had it hooked up.

I have 4..... 8 ohm resistors wired in parallel, 4 leads to one end and 4 leads to the other end. I hooked a terminal of the amp to each end.

I only had it hooked to the bad channel. Maybe a 2 ohm load makes the amp draw to much current?

I guess I could just use 1 and do an 8 ohm load that probably wouldnt draw much current?
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Old 4th December 2012, 07:50 AM   #96
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Amp connected straight to supply, all parts in circuit, all 3 jumpers installed, defective channel, 8 ohm load, scope set at 2ms/20vd.
Attached Images
File Type: jpg 800.2 output with a 8 ohm load 001.jpg (824.8 KB, 34 views)
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Old 4th December 2012, 06:04 PM   #97
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Lift D202 again to see if there is any change with the load.
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Old 4th December 2012, 08:11 PM   #98
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Im sorry Perry I should have been more specific, all parts are in the circuit except D202.

The load signal you are seeing is with D202 removed.
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Old 4th December 2012, 10:03 PM   #99
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Try this with both a higher and lower frequency signal. Does the distortion always happen precisely the the bottom of the waveform?

Is there possibly a small ceramic capacitor near the components that were replaced that was damaged?
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Old 5th December 2012, 04:57 AM   #100
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Amp connected directly to supply, all parts except D202 in circuit, all 3 jumpers installed, 8 ohm load, scope setting 2ms/20vd.

1st pic: high frequency
2nd pic: low frequency

It seems to be more sensitive to the higher frequency.
The lower frequency still kinda looks funny at full volume.
Attached Images
File Type: jpg 800.2 different frequecies 001.jpg (952.0 KB, 22 views)
File Type: jpg 800.2 different frequecies 002.jpg (976.3 KB, 19 views)
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