stetsom

megael9 · 26th June 2011, 02:48 AM

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.

Perry Babin · 26th June 2011, 03:42 AM

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.

megael9 · 27th June 2011, 03:18 AM

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.

Perry Babin · 27th June 2011, 11:23 PM

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.

megael9 · 28th June 2011, 02:37 AM

just the 4 ics, not the 2 boards?

Perry Babin · 28th June 2011, 03:24 AM

Post a photo showing the tops of the ICs on the driver boards.

megael9 · 29th June 2011, 05:41 AM

please indicate the test points. thanks in advance.

Perry Babin · 29th June 2011, 05:45 AM

The IR ICs near the main board are the drivers. Leave the 4011s in their sockets.

megael9 · 29th June 2011, 05:50 AM

please indicate the test points. thanks in advance.

Perry Babin · 29th June 2011, 05:57 AM

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.

26th June 2011, 02:48 AM	#1
megael9 diyAudio Member Join Date: Oct 2009	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. __________________ 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.

26th June 2011, 03:42 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th June 2011, 11:23 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

28th June 2011, 02:37 AM	#5
megael9 diyAudio Member Join Date: Oct 2009	just the 4 ics, not the 2 boards? __________________ 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.

28th June 2011, 03:24 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post a photo showing the tops of the ICs on the driver boards. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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29th June 2011, 05:45 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The IR ICs near the main board are the drivers. Leave the 4011s in their sockets. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th June 2011, 05:57 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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