Samson SX1200

King Mustang · 3rd October 2012, 04:19 PM

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.

tauro0221 · 3rd October 2012, 04:26 PM

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.

King Mustang · 3rd October 2012, 04:28 PM

The relay on the board does not click on channel 1 but works on channel 2.

King Mustang · 3rd October 2012, 04:30 PM

Will those transistors be 2sa1930 / 2sc5171 and 2sa 1943 / 2sc 5200

jitter · 3rd October 2012, 05:30 PM

Do you have the equipment and skill to take measurements?

King Mustang · 3rd October 2012, 05:50 PM

I do have a meter and some skills

jitter · 3rd October 2012, 06:29 PM

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.

King Mustang · 3rd October 2012, 06:38 PM

How much voltage should the relay have ? Which are the output transistors and should they be tested and how ie meter settings

jitter · 05:08 AM

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.

King Mustang · 4th October 2012, 02:17 PM

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

3rd October 2012, 04:19 PM	#1
King Mustang diyAudio Member Join Date: Oct 2012 Location: Florida	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.

4th October 2012, 05:06 AM	#9
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	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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3rd October 2012, 04:26 PM	#2
tauro0221 diyAudio Member Join Date: Nov 2008 Location: Victoria,TX	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.

3rd October 2012, 04:28 PM	#3
King Mustang diyAudio Member Join Date: Oct 2012 Location: Florida	The relay on the board does not click on channel 1 but works on channel 2.

3rd October 2012, 04:30 PM	#4
King Mustang diyAudio Member Join Date: Oct 2012 Location: Florida	Will those transistors be 2sa1930 / 2sc5171 and 2sa 1943 / 2sc 5200

3rd October 2012, 05:30 PM	#5
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	Do you have the equipment and skill to take measurements?

3rd October 2012, 05:50 PM	#6
King Mustang diyAudio Member Join Date: Oct 2012 Location: Florida	I do have a meter and some skills

3rd October 2012, 06:29 PM	#7
jitter diyAudio Member Join Date: Aug 2004 Location: Eindhoven, The Netherlands	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.

3rd October 2012, 06:38 PM	#8
King Mustang diyAudio Member Join Date: Oct 2012 Location: Florida	How much voltage should the relay have ? Which are the output transistors and should they be tested and how ie meter settings

4th October 2012, 02:17 PM	#10
King Mustang diyAudio Member Join Date: Oct 2012 Location: Florida	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