xtant 121m question

shagone · 3rd March 2009, 05:18 PM

Hi guys,

i'm in need of help with an xtant 121m mono amp. the amp plays fine with no dc offset but it has a green light on to the left that does not go out when the remote signal is removed. what is that green light for again, i forget? the red light that i think should be on when remote is present in never on just the green light. i sold this amp to a guy thinking it worked fine but now it is draining his battery because it is idleing all the time so i need to fix it for him or replace it pronto. i checked his install and all seems fine and i checked the amp jumpers and they all seem ok too. Help please???

shagone · 8th March 2009, 10:48 PM

I know someone out there has more knowledge than me on this amp. please help? what does the green light mean and why might the power not be turning off?

1moreamp · 9th March 2009, 12:06 AM

afternoon shagone,
Xtant is a pretty much dead product line especially after MTX bought them out, and pretty much does NOT support any of the Xtant gear.

I have seen the problem your talking about and you should look for a TO-220 transistor standing vertical near the power supply control IC. I found it to be shorted in my experience with Xtant. This will keep the amp turned on. Just track back the turn on lead wire connection from the terminal block. it should lead you to the defective turn on transistor near the PWM controller chip circuitry...Best of luck, old friend..C

PS don't get it confused with the fan driver transistor that should be also located near by....

shagone · 9th March 2009, 06:15 PM

thanks 1moreamp i'll be checking it out soon. i figured i'd just have to track the circuit back but now at least i have something to shoot for to make it quicker.

have you seen the latest xtant/mitek amps? they sure look nice but i wonder how they perform??

3rd March 2009, 05:18 PM	#1
shagone diyAudio Member Join Date: Apr 2007	xtant 121m question Hi guys, i'm in need of help with an xtant 121m mono amp. the amp plays fine with no dc offset but it has a green light on to the left that does not go out when the remote signal is removed. what is that green light for again, i forget? the red light that i think should be on when remote is present in never on just the green light. i sold this amp to a guy thinking it worked fine but now it is draining his battery because it is idleing all the time so i need to fix it for him or replace it pronto. i checked his install and all seems fine and i checked the amp jumpers and they all seem ok too. Help please???

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8th March 2009, 10:48 PM	#2
shagone diyAudio Member Join Date: Apr 2007	I know someone out there has more knowledge than me on this amp. please help? what does the green light mean and why might the power not be turning off?

9th March 2009, 12:06 AM	#3
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	afternoon shagone, Xtant is a pretty much dead product line especially after MTX bought them out, and pretty much does NOT support any of the Xtant gear. I have seen the problem your talking about and you should look for a TO-220 transistor standing vertical near the power supply control IC. I found it to be shorted in my experience with Xtant. This will keep the amp turned on. Just track back the turn on lead wire connection from the terminal block. it should lead you to the defective turn on transistor near the PWM controller chip circuitry...Best of luck, old friend..C PS don't get it confused with the fan driver transistor that should be also located near by....

9th March 2009, 06:15 PM	#4
shagone diyAudio Member Join Date: Apr 2007	thanks 1moreamp i'll be checking it out soon. i figured i'd just have to track the circuit back but now at least i have something to shoot for to make it quicker. have you seen the latest xtant/mitek amps? they sure look nice but i wonder how they perform??

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