Avt275 powers up but no sound

mgreczek · 04-10-2008, 12:20 PM

Hi

I just got my hands on Avt275 that I hope I might be able to fix.
I read through a lot of posts on this forum and I found one that talks about same problem but not solution.

Amp powers up and LEDs are working when switching channels but there is no output. I also tried headphones or emulated line but no luck.
I took all bords out and examine them. There is no evidence of anything being burnt.

Without schematic it is very hard for me to further debug this problem. I spend half a day looking for AVT150 schematics but I was only able to find one page.
Could anybody share schematic? I would greatly appreciate it.

I also read that my problem could be cause by shorted mute circuit.
Does enyone know where it is located?

Thanks for your help.

techineer · 06-24-2009, 04:04 PM

I see you never got an answer... if you still have the unit and haven't fixed it, see this thread:

Marshall AVT275 - No Sound From Main Speakers

04-10-2008, 12:20 PM	#1
mgreczek Junior Member Join Date: Apr 2008 Posts: 4	Avt275 powers up but no sound Hi I just got my hands on Avt275 that I hope I might be able to fix. I read through a lot of posts on this forum and I found one that talks about same problem but not solution. Amp powers up and LEDs are working when switching channels but there is no output. I also tried headphones or emulated line but no luck. I took all bords out and examine them. There is no evidence of anything being burnt. Without schematic it is very hard for me to further debug this problem. I spend half a day looking for AVT150 schematics but I was only able to find one page. Could anybody share schematic? I would greatly appreciate it. I also read that my problem could be cause by shorted mute circuit. Does enyone know where it is located? Thanks for your help.

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06-24-2009, 04:04 PM	#2
techineer Member Join Date: Jun 2009 Posts: 60	I see you never got an answer... if you still have the unit and haven't fixed it, see this thread: Marshall AVT275 - No Sound From Main Speakers

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