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Old 26th June 2011, 02:48 AM   #1
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Join Date: Oct 2009
Default stetsom

Im working on a stetsom model # 5k2 e
this unit in going on protection mode, and
if I diconnect the 8 rectifier, protection
goes away. one of the 8 irfp90n20d was
leakage, and was replaced, I disconnected
all audio transistor {irfp90n20d} and power
up the amp, but no difference, no other transistor
was shortage or leakage, any idea on how to
troubleshoot this amp. thanks in advance.
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Old 26th June 2011, 03:42 AM   #2
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Location: Louisiana
I'm somewhat familiar with the smaller version. Post a photo of the inside of the amp so I can see if it's similar to the smaller version.
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Old 27th June 2011, 03:18 AM   #3
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Here are 3 pictures of this amp. by the way I was having
a fail err when try to up load this pictures, I then open this
picture with the paint program the comes with wndows,
save them, and that did the trick for me, hope this can help
others.
Attached Images
File Type: jpg 423.jpg (711.3 KB, 150 views)
File Type: jpg 422.jpg (713.2 KB, 141 views)
File Type: jpg 421.jpg (751.2 KB, 135 views)
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Old 27th June 2011, 11:23 PM   #4
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Location: Louisiana
That appears similar to the smaller one. In the smaller amp, you can pull the driver ICs and the amp will produce all drive signals to the inputs of the driver ICs. Pull the driver ICs in this one to see if you have a clean square wave on the inputs of the driver ICs.
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Old 28th June 2011, 02:37 AM   #5
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just the 4 ics, not the 2 boards?
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fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
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Old 28th June 2011, 03:24 AM   #6
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Location: Louisiana
Post a photo showing the tops of the ICs on the driver boards.
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Old 29th June 2011, 05:41 AM   #7
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Default driver boards

please indicate the test points. thanks in advance.
Attached Images
File Type: jpg 002.jpg (324.5 KB, 99 views)
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
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Old 29th June 2011, 05:45 AM   #8
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Location: Louisiana
The IR ICs near the main board are the drivers. Leave the 4011s in their sockets.
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Old 29th June 2011, 05:50 AM   #9
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Default driver boards

please indicate the test points. thanks in advance.
Attached Images
File Type: jpg 002.jpg (324.5 KB, 98 views)
File Type: jpg 001.jpg (270.5 KB, 35 views)
File Type: jpg diy6.jpg (504.8 KB, 34 views)
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
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Old 29th June 2011, 05:57 AM   #10
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Look up the datasheet for the driver ICs (resolution isn't good enough to read the numbers) and look at the signal on the Hin and Lin pins on the IC.
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