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Old 15th March 2012, 02:17 AM   #1
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Default Earthquake PH5000

A guy brought me this for repair..

The amp powers up and plays but he stated it had very low output..

Any ideas what to look for ?
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Old 15th March 2012, 05:34 AM   #2
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Do you have a rail to rail square wave on the output transistors. If it has only one rail, 0v to rail square wave.
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Old 15th March 2012, 09:59 PM   #3
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There are 8 outputs per side (P50NE1) on the first 4 outputs per side i get the following squarewave on the legs 1 and 3 --- pic 1


On the next 4 outputs per side i get the following squarewave on the middle leg--- pic 2

Scope settings--- 20 volts div 2us

The 3rd pic is the gate legs of the outputs that have a squarewave on the middle leg
Attached Images
File Type: jpg Earthquake.JPG (184.6 KB, 29 views)
File Type: jpg earthquake 1.JPG (94.1 KB, 25 views)
File Type: jpg earthquake1.JPG (204.1 KB, 23 views)

Last edited by mike49504; 15th March 2012 at 10:05 PM.
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Old 15th March 2012, 11:49 PM   #4
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You stated that he stated that it had very low output. Does it produce only low level audio out when driven with a strong signal?
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Old 16th March 2012, 12:08 AM   #5
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When he brought it to me he said that it had low output .. On the bench i can only get it so loud but it seems to be working correctly for me..


He also stated that a kicker 1000 watt amp was louder in his car then this amp..


So not really sure if theres anything wrong with it or not just going by what he said..
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