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Old 9th March 2013, 06:34 PM   #1
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Default Xtant X1001

My friend came over with one of theese..

I removed all power supply fets since they were shorted..

I replaced all 4 of the A56's on the board also replaced the 10 ohm resistors..

Left the power supply fets out and hooked the amp up to look at the gate signal ..

With no power supply fets installed the amp burns all 4 of the A56's in it within 5 secs Any ideas?
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Old 9th March 2013, 09:55 PM   #2
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Remove the PZTA56s and the 10 ohm resistors. Replace the 10 ohm resistors (R430/431?) with 1k resistors. Do you see a square wave on the base of the A56s?
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Old 9th March 2013, 10:51 PM   #3
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Do you want me to leave the 56's out and touch the bvase pad or replace the 56's then do the test after the 1k resistors are in?
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Old 10th March 2013, 12:29 AM   #4
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Leave the 56s out.
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Old 10th March 2013, 12:45 AM   #5
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i see a squre wave but it doesnt look good at all
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Old 10th March 2013, 03:35 AM   #6
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You'll either have to post a photo or be MUCH more descriptive.
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Old 10th March 2013, 03:51 AM   #7
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The square wave looks more like a triangle wave If need be ill post a pic
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Old 10th March 2013, 04:21 AM   #8
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Post a photo and include the scope settings.
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Old 11th March 2013, 10:59 AM   #9
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Back to this amp..

As soon as my camera charges i will post a pic..

I get a nice square wave on pin 8 of the TL494 but the square wave is distorted on the Base of the A56's..

Dont know if this helps any
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Old 11th March 2013, 08:51 PM   #10
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Heres a pic of the square wave on the base of the 56's


Scope is set to 5us .5 volts div
Attached Images
File Type: jpg Xtant.JPG (194.5 KB, 23 views)
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