Amiga 4000 audio capacitor help

r.cade · 22 January 2012, 03:29

Hi guys,

I have a couple of A4000's with low/crackly audio, which is classic capacitor issue (or worse, if left too long).

It seems I removed C433 and C443 a long time ago one one board, and then didn't replace them. Now unfortunately, C443 has one of the pads lifted (the one further from the edge of the board).

I looked over the schematics to see where I could jump a wire to fix this, and it looks like this cap goes between R403C and R443. However, those aren't marked on my board! Is there a board layout somewhere to show which resistors these are?

Has someone done this and had to fix it before and could give a hint?

voyager · 27 January 2012, 18:35

Pictures?.... I just did my a 4000D.

r.cade · 27 January 2012, 21:32

I just scraped a little off the trace going to the pad and "made a new one". It was enough to get the cap connected.

However, I think it has other damage, as the volume in both channels is super-low and distorted.

I'll try to take photos, but I don't think I have a camera or a good setup to get that detail.

22 January 2012, 03:29	#1
r.cade Registered User Join Date: Aug 2006 Location: Augusta, Georgia, USA Posts: 548	Amiga 4000 audio capacitor help Hi guys, I have a couple of A4000's with low/crackly audio, which is classic capacitor issue (or worse, if left too long). It seems I removed C433 and C443 a long time ago one one board, and then didn't replace them. Now unfortunately, C443 has one of the pads lifted (the one further from the edge of the board). I looked over the schematics to see where I could jump a wire to fix this, and it looks like this cap goes between R403C and R443. However, those aren't marked on my board! Is there a board layout somewhere to show which resistors these are? Has someone done this and had to fix it before and could give a hint?

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27 January 2012, 18:35	#2
voyager The show must go on. Join Date: Dec 2010 Location: Alkmaar Nederland Posts: 269	Pictures?.... I just did my a 4000D.

27 January 2012, 21:32	#3
r.cade Registered User Join Date: Aug 2006 Location: Augusta, Georgia, USA Posts: 548	I just scraped a little off the trace going to the pad and "made a new one". It was enough to get the cap connected. However, I think it has other damage, as the volume in both channels is super-low and distorted. I'll try to take photos, but I don't think I have a camera or a good setup to get that detail.

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