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Old 3rd October 2012, 04:19 PM   #1
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Default Samson SX1200

I have a Samsom SX1200 that is in protect mode. I overlooked channel 1 and found a resistor brunt out 3.3 k ohm 1/4 watt I replaced that resistor and the amp is still in protect mode. I would like to know what should be my next area to check.
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Old 3rd October 2012, 04:26 PM   #2
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Hi,
Normally when an amplifier goes into protected mode it is because there it is a high voltage going to the speakers. So it is protecting your speaker from burn them out. Check the voltage at the relay before goes to the speaker. It is possible that you have bad output transistors.
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Old 3rd October 2012, 04:28 PM   #3
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The relay on the board does not click on channel 1 but works on channel 2.
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Old 3rd October 2012, 04:30 PM   #4
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Will those transistors be 2sa1930 / 2sc5171 and 2sa 1943 / 2sc 5200
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Old 3rd October 2012, 05:30 PM   #5
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Do you have the equipment and skill to take measurements?
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Old 3rd October 2012, 05:50 PM   #6
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I do have a meter and some skills
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Old 3rd October 2012, 06:29 PM   #7
jitter is offline jitter  Netherlands
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Well then it's time to put them to good use.
First thing is to check for large amount of DC on the output. Since the speaker relay is open, you must measure as tauro0221 suggested.
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Old 3rd October 2012, 06:38 PM   #8
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How much voltage should the relay have ? Which are the output transistors and should they be tested and how ie meter settings
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Old 4th October 2012, 05:06 AM   #9
jitter is offline jitter  Netherlands
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Sounds like you're a novice. Nothing wrong with that, but when it comes to an amp from which there's no service manual or schematics available, it's near undoable to explain where to measure what value and what might be wrong.

Without the schematics, experience is needed to recognize the parts, what their functions are and to know what voltages are correct and what not.
I'm sorry, but I'm not going to be able to help you. My advice is to ask help from someone who knows his way around amps.

Last edited by jitter; 4th October 2012 at 05:08 AM.
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Old 4th October 2012, 02:17 PM   #10
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I would first like to say thanks for your replies. I just got off the phone with Samson (1-800-372-6766 ) and found out that a brand new circuit will only cost $100. so I ordered channel 1 I think this was the easy way out.

Thanks again Angel
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