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Old 3rd December 2019, 12:35 AM   #1
caraudioguy2100 is offline caraudioguy2100
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Default Old school Soundstream Tarantula

Not sure of the model number .

I got this amp in for repair and when I try to increase the input voltage
(Turn the volume up on head unit ) the amp will protect on me and as soon as I lower the volume on head unit it will power back up .

Does this sound like a problem in the preamp section ?

Or wondering where I should start checking
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Old 3rd December 2019, 12:40 AM   #2
Perry Babin is offline Perry Babin  United States
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Does it do it without a load?
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Old 3rd December 2019, 12:55 AM   #3
caraudioguy2100 is offline caraudioguy2100
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No
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Old 3rd December 2019, 01:11 AM   #4
caraudioguy2100 is offline caraudioguy2100
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Let me check a few things and Iíll get back to you since the amp has no output now
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Old 3rd December 2019, 01:31 AM   #5
Perry Babin is offline Perry Babin  United States
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If it only does it with a load, it's generally due to an emitter resistor out of tolerance, with a bad connection or a leaky protection transistor.

When it gets audio again, drive only one channel with a load to see which channel is causing the problem.
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Old 3rd December 2019, 04:56 AM   #6
caraudioguy2100 is offline caraudioguy2100
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I found an LM34DZ which appears to be a temperature sensor

Leg 1 is the +5 volts
Leg 2 is the output
Leg 3 is the ground

According to the data sheet I found

Here are the measurements I get

Leg 1 to Leg 2: 30.0 ohms
Leg 1 to leg 3: 16.1 ohms
Leg 2 to leg 3: 16.4 ohms

Does this appear to be defective or is it suppose to measure like this ?
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Old 3rd December 2019, 05:19 AM   #7
Perry Babin is offline Perry Babin  United States
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If you heat/cool it do you get a varying output?

Those resistances do seem low.
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Old 3rd December 2019, 05:34 AM   #8
caraudioguy2100 is offline caraudioguy2100
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Heating or cooling it makes no change at all .

I will go through the rest of the amp and see if I find anything else bad .

After going through the amp I will order a new one and take readings off it .

I think the amp is stuck in protection now since itís not producing rail or regulated voltages
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Old 3rd December 2019, 06:58 AM   #9
caraudioguy2100 is offline caraudioguy2100
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Ok something in the circuit is causing the temp sensor to read bad .

There are caps that show they are shorted along with multiple transistors reading shorted.

I will have to check the entire circuit to figure out which part is causing This issue
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