Looking for a electrician..

Code · 6th February 2006, 07:52 PM

Im in need of someone (preferably in the UK) who could replace whatever is broken on my 2020 t-amp, im willing to pay for your time + parts of course. any offers?

Netlist · 6th February 2006, 08:20 PM

No offer from my part unless you want to ship it to Belgium.

Any chance you could tackle the job yourself. After all this is 'the' Diy-site.
What's wrong with it? Not that I know the 2020.

/Hugo

Code · 6th February 2006, 08:35 PM

It doesn't make a sound, this was after i installed two 2200uf obligatto capacitors. It did work for a short time but a capacitor leg detached from the PCB when it was moved, i re soldered but it hasn't worked since.

I have tried to find the problem but after playing around with a oscilloscope for a few hours I'm non the wiser..and my soldering skills are terrible.

Netlist · 6th February 2006, 08:50 PM

Well yes, you could be right. It's perhaps better to practice first instead of trying something you feel you can't handle.

/Hugo

JonHarrison · 6th February 2006, 08:52 PM

Hi,

Do you have a schematic of this amp ?

Regards,

Jon

Code · 6th February 2006, 08:54 PM

im not sure what a shematic is, all the information i have is here:

http://www.autocostruire.com/audiodigit/class-t-e.pdf

JonHarrison · 6th February 2006, 09:23 PM

Hi,

The schematic is shown on page 8. Referring to this diagram where did you fit the 2200uf capacitors ? Although there is no sound at the output did you see any high frequency oscillation on the 'scope ?

Regards,

Jon

Trebla · 6th February 2006, 09:38 PM

If these are C4 and c7 then they have to be installed the correct way round. Have you done this?

Code · 6th February 2006, 09:43 PM

the caps are fitted where the two largest circles are.

the 'scope is probably setup wrong but it just showed random looking lines when the the contacts were first touched, then just a straight line higher up the y-axis showing what i presume is the voltage.

edit: just saw trebla's post,

there are no markings on the obligattos but the amp did work perfectly before it was moved so i presume it was ok? Also I have switched back to the original caps for testing.

Trebla · 6th February 2006, 10:07 PM

Ok. So the Obligatos are film caps and not directional.
Do you think that the pcb track may have got damaged when you swapped caps?
I would check each joint carefully with a magnifying glass for signs of damage.
Check that you haven't inadvertantly spread solder onto another joint. Then briefly touch every joint on the pcb with a soldering iron (just enough to to melt the solder) in case you have a dry join somewhere.
If you could give a bit more detail of what you did before the amp stopped working, that may help!

6th February 2006, 07:52 PM	#1
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	Looking for a electrician.. Im in need of someone (preferably in the UK) who could replace whatever is broken on my 2020 t-amp, im willing to pay for your time + parts of course. any offers?

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6th February 2006, 08:20 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	No offer from my part unless you want to ship it to Belgium. Any chance you could tackle the job yourself. After all this is 'the' Diy-site. What's wrong with it? Not that I know the 2020. /Hugo

6th February 2006, 08:35 PM	#3
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	It doesn't make a sound, this was after i installed two 2200uf obligatto capacitors. It did work for a short time but a capacitor leg detached from the PCB when it was moved, i re soldered but it hasn't worked since. I have tried to find the problem but after playing around with a oscilloscope for a few hours I'm non the wiser..and my soldering skills are terrible.

6th February 2006, 08:50 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	Well yes, you could be right. It's perhaps better to practice first instead of trying something you feel you can't handle. /Hugo

6th February 2006, 08:52 PM	#5
JonHarrison diyAudio Member Join Date: Mar 2004 Location: UK	Hi, Do you have a schematic of this amp ? Regards, Jon

6th February 2006, 08:54 PM	#6
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	im not sure what a shematic is, all the information i have is here: http://www.autocostruire.com/audiodigit/class-t-e.pdf

6th February 2006, 09:23 PM	#7
JonHarrison diyAudio Member Join Date: Mar 2004 Location: UK	Hi, The schematic is shown on page 8. Referring to this diagram where did you fit the 2200uf capacitors ? Although there is no sound at the output did you see any high frequency oscillation on the 'scope ? Regards, Jon

6th February 2006, 09:38 PM	#8
Trebla diyAudio Member Join Date: Nov 2005 Location: North West	If these are C4 and c7 then they have to be installed the correct way round. Have you done this?

6th February 2006, 09:43 PM	#9
Code diyAudio Member Join Date: Jan 2006 Location: leeds, uk	the caps are fitted where the two largest circles are. the 'scope is probably setup wrong but it just showed random looking lines when the the contacts were first touched, then just a straight line higher up the y-axis showing what i presume is the voltage. edit: just saw trebla's post, there are no markings on the obligattos but the amp did work perfectly before it was moved so i presume it was ok? Also I have switched back to the original caps for testing.

6th February 2006, 10:07 PM	#10
Trebla diyAudio Member Join Date: Nov 2005 Location: North West	Ok. So the Obligatos are film caps and not directional. Do you think that the pcb track may have got damaged when you swapped caps? I would check each joint carefully with a magnifying glass for signs of damage. Check that you haven't inadvertantly spread solder onto another joint. Then briefly touch every joint on the pcb with a soldering iron (just enough to to melt the solder) in case you have a dry join somewhere. If you could give a bit more detail of what you did before the amp stopped working, that may help!

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