Amiga 4000D Audio Amplifier Circuit Replacement

salocinx · 27 August 2016, 00:55

Hi Amigians

I got an Amiga 4000D with a severe audio problem. The previous owner told me, that he tried to fix the damaged circuit because of leaked capacitors. But he really messed up and it looks very, very bad on the whole audio amplifier circuit.

I have successfully fixed the same issue on my Amiga 4000D, but this one looks really hopeless!

Therefore I wanted to ask, if somebody has already rebuild the amplifier circuit on a small PCB? If so, an Eagle CAD file would be great

The best would be a piggyback solution to put onto Paula...

I am looking forward for any feedback

idrougge · 27 August 2016, 06:31

I just replaced the old op-amps and fixed corroded connections using wire.

ajk · 27 August 2016, 07:13

Can you take a picture? Is it just a messy soldering job or is there severe board damage?

idrougge · 27 August 2016, 18:57

It was bad enough, probably the worst case of capacitor leakage I've ever encountered. Some pads were just gone. I traced the lost traces using the schematics and used short bits of wire to replace the damaged traces.

salocinx · 29 August 2016, 14:00

Here are two pictures...:

A4000D_Audio_Cicuit_Damage.zip

Doesn't look too good ;-)

ajk · 29 August 2016, 14:57

Yikes! Pretty ugly, but that could still be fixed to a reasonable standard. Just going to be a lot of work, have to strip the parts off and start again

salocinx · 29 August 2016, 23:29

Yes, like I initially mentioned ;-) Therefore, a piggyback solution to put on Paula would be a nice alternative solution. If nobody has designed a PCB yet, I will think about making one by myself as soon as I find some spare time.

bebek · 03 September 2016, 23:10

Quote:

Originally Posted by salocinx

Yes, like I initially mentioned ;-) Therefore, a piggyback solution to put on Paula would be a nice alternative solution. If nobody has designed a PCB yet, I will think about making one by myself as soon as I find some spare time.

There is only left and right audio taken off Paula, the resy will have to be wired unless you want simple amplifier only ...

27 August 2016, 00:55	#1
salocinx Registered User Join Date: Jan 2014 Location: St.Gallen / Switzerland Posts: 84	Amiga 4000D Audio Amplifier Circuit Replacement Hi Amigians I got an Amiga 4000D with a severe audio problem. The previous owner told me, that he tried to fix the damaged circuit because of leaked capacitors. But he really messed up and it looks very, very bad on the whole audio amplifier circuit. I have successfully fixed the same issue on my Amiga 4000D, but this one looks really hopeless! Therefore I wanted to ask, if somebody has already rebuild the amplifier circuit on a small PCB? If so, an Eagle CAD file would be great The best would be a piggyback solution to put onto Paula... I am looking forward for any feedback

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27 August 2016, 06:31	#2
idrougge Registered User Join Date: Sep 2007 Location: Stockholm Posts: 4,332	I just replaced the old op-amps and fixed corroded connections using wire.

27 August 2016, 07:13	#3
ajk Registered User Join Date: May 2010 Location: Helsinki, Finland Posts: 1,341	Can you take a picture? Is it just a messy soldering job or is there severe board damage?

27 August 2016, 18:57	#4
idrougge Registered User Join Date: Sep 2007 Location: Stockholm Posts: 4,332	It was bad enough, probably the worst case of capacitor leakage I've ever encountered. Some pads were just gone. I traced the lost traces using the schematics and used short bits of wire to replace the damaged traces.

29 August 2016, 14:00	#5
salocinx Registered User Join Date: Jan 2014 Location: St.Gallen / Switzerland Posts: 84	Here are two pictures...: A4000D_Audio_Cicuit_Damage.zip Doesn't look too good ;-)

29 August 2016, 14:57	#6
ajk Registered User Join Date: May 2010 Location: Helsinki, Finland Posts: 1,341	Yikes! Pretty ugly, but that could still be fixed to a reasonable standard. Just going to be a lot of work, have to strip the parts off and start again

29 August 2016, 23:29	#7
salocinx Registered User Join Date: Jan 2014 Location: St.Gallen / Switzerland Posts: 84	Yes, like I initially mentioned ;-) Therefore, a piggyback solution to put on Paula would be a nice alternative solution. If nobody has designed a PCB yet, I will think about making one by myself as soon as I find some spare time.

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