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Old 29th May 2010, 01:04 AM   #1
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Default Directed 1100 D

I recieved this amp in for repair. The amp keeps clicking from on to protection mode.

I checked the outputs in circuit all seem to test fine power supply fets also seem to test ok.

Wondering where i begin checking now?
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Old 29th May 2010, 02:18 AM   #2
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Do you ever see oscillation on the center legs of any output? Set the scope to 50v/div (5v/div with your scope?).
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Old 29th May 2010, 02:36 AM   #3
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50 volts/div and do i set the scope to us or ms?
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Old 29th May 2010, 02:39 AM   #4
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The timebase setting isn't really important at this point. If you set it to ~2mS and it's oscillating, you'll see two horizontal line with 'haze' between them. If you set it to 5uS, you'll see a square wave if it's oscillating and the scope locks on it.
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Old 29th May 2010, 02:49 AM   #5
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I dont have 50 volts/div highest setting i have is 20/volts div
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Old 29th May 2010, 02:55 AM   #6
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Ok i set my scope forst to 20volts/div then 10volts/div the 5 volts/div

Do not see any oscillation on any of the center legs of outputs.

I did notice R501 gets red hot to the point its almost glowing red though
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Old 29th May 2010, 04:39 AM   #7
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Do you have significant DC on any of the center legs?
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Old 29th May 2010, 04:51 AM   #8
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with black probe on non bridging speaker terminal i have -68.1 volts on all the center legs of the outputs
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Old 29th May 2010, 04:52 AM   #9
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On ALL of the outputs or only on half of them?
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Old 29th May 2010, 04:53 AM   #10
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ON all of them
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