Can I check hexfet out of circuit Xtant Amp

Fixer · 2nd December 2010, 02:59 AM

If so how is it done I working on a xtant xt1001 and have no schematic on it and would love to work on it and it been worked on before and need to any help I can get. It turned on the sub is driven full out and reverse the leads and the coil is full in . I suspect outputs but never worked on a Hexfet Amp before it acts like outputs and would like to check them.

been a tech for 36 years but this is a new animal for me hexfet

Perry Babin · 2nd December 2010, 03:30 AM

HEXFET is a trade name. The transistor is nothing more than an N-channel, enhancement mode MOSFET.

Fixer · 2nd December 2010, 10:25 AM

When I check the fets they will turn on with DVM in diode checker mode. They should conduct(on) and non conduct (off) like a standard mosfet power fet? I see there is a zener added between sorce and drain inside them but they should check the same as the regular fets on or off with DVM in diode checker mode. The zener checks good but that is all that biases so the fets open(bad)?

Fixer · 2nd December 2010, 11:35 AM

Should read when I check regular mosfets power outputs they will turn on with DVM in diode checker mode.

Sorry about that these just check off

Fixer · 2nd December 2010, 12:06 PM

I need a pic if the section of the amp board that has the mute Led as a couple smd semiconductors are not right. If anyone can help? They were changed and the other shop was guessing what they were as the had no schematic or cross numbers to go by and have way of knowing what the originals were so a pic would be very helpful. Also the original problem was it was in mute mode axtant told him over the phone as the led was lit they tell me and they said they said they did not know how to take it out of mute mode?

Perry Babin · 2nd December 2010, 06:50 PM

X1001 or XT1001?

Go to the FET section of the following page:
Basic Amplifier Repair - Transistor Test Applet Link

What output transistors are they using?

Fixer · 2nd December 2010, 08:47 PM

Perry your the man

thank you
they are using FB42N20D in the section I am working on

the help is very much appreciated
Albert

Fixer · 2nd December 2010, 08:51 PM

my type error X1001 not xt1001 sorry about that
Albert

Perry Babin · 2nd December 2010, 09:46 PM

What parts do you need a photo of?

Fixer · 3rd December 2010, 01:20 AM

the section on the input side has the amp gain adjust,Q236,D262 ,Q221,R222 and LED 236 (mute led)
thanks
Albert

2nd December 2010, 02:59 AM	#1
Fixer diyAudio Member Join Date: Dec 2010	Can I check hexfet out of circuit Xtant Amp If so how is it done I working on a xtant xt1001 and have no schematic on it and would love to work on it and it been worked on before and need to any help I can get. It turned on the sub is driven full out and reverse the leads and the coil is full in . I suspect outputs but never worked on a Hexfet Amp before it acts like outputs and would like to check them. been a tech for 36 years but this is a new animal for me hexfet

2nd December 2010, 03:30 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	HEXFET is a trade name. The transistor is nothing more than an N-channel, enhancement mode MOSFET. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd December 2010, 06:50 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	X1001 or XT1001? Go to the FET section of the following page: Basic Amplifier Repair - Transistor Test Applet Link What output transistors are they using? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd December 2010, 09:46 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	What parts do you need a photo of? __________________ 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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2nd December 2010, 10:25 AM	#3
Fixer diyAudio Member Join Date: Dec 2010	When I check the fets they will turn on with DVM in diode checker mode. They should conduct(on) and non conduct (off) like a standard mosfet power fet? I see there is a zener added between sorce and drain inside them but they should check the same as the regular fets on or off with DVM in diode checker mode. The zener checks good but that is all that biases so the fets open(bad)?

2nd December 2010, 11:35 AM	#4
Fixer diyAudio Member Join Date: Dec 2010	Should read when I check regular mosfets power outputs they will turn on with DVM in diode checker mode. Sorry about that these just check off

2nd December 2010, 12:06 PM	#5
Fixer diyAudio Member Join Date: Dec 2010	I need a pic if the section of the amp board that has the mute Led as a couple smd semiconductors are not right. If anyone can help? They were changed and the other shop was guessing what they were as the had no schematic or cross numbers to go by and have way of knowing what the originals were so a pic would be very helpful. Also the original problem was it was in mute mode axtant told him over the phone as the led was lit they tell me and they said they said they did not know how to take it out of mute mode?

2nd December 2010, 08:47 PM	#7
Fixer diyAudio Member Join Date: Dec 2010	Perry your the man thank you they are using FB42N20D in the section I am working on the help is very much appreciated Albert

2nd December 2010, 08:51 PM	#8
Fixer diyAudio Member Join Date: Dec 2010	my type error X1001 not xt1001 sorry about that Albert

3rd December 2010, 01:20 AM	#10
Fixer diyAudio Member Join Date: Dec 2010	the section on the input side has the amp gain adjust,Q236,D262 ,Q221,R222 and LED 236 (mute led) thanks Albert

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