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09 September 2009, 17:07
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#1 |
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Registered User
Join Date: Sep 2009
Location: Norway
Posts: 1,715
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Low and cracking sound on A1200
Information:
- Amiga 1200 Rev 1D.4 - The PSU voltages are measured and fine - No leaking SMD capacitors found - The crack/quietness occurs in both channels at the same time, so I guess it's an SMD in the amp that's broken - When it occurs, the sound is very "filtered". The higher frequencies are cutted.. Exactly as when the Amiga LED filter is on.  - I've tried resolder 'em, still no go. - It comes and goes, sometimes the sound is fine... What should I do? And what's the voltage/µF of these small SMDs?
Last edited by 8bitbubsy; 10 September 2009 at 01:25. |
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09 September 2009, 17:51
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#2 |
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Registered User
Join Date: Sep 2006
Location: Thunder Bay, Canada
Posts: 4,323
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The capacitors don't actually have to leak in order to degrade. A lot of electrolytic caps are rated 1000, 2000 or 3000 hours so it is possible they are tired. I would start by changing the left and right channel caps and see if that makes a difference.
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10 September 2009, 00:57
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#3 |
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I hate potatos and shirts
Join Date: Oct 2007
Location: Sao Leopoldo / Brazil
Age: 58
Posts: 3,482
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I bet my a** that the problem are the two 22uF x 25V capacitors on audio out.
For a complete list of all capacitors, there is a new thread even showing a picture of all of them with the necessary values created today. 
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10 September 2009, 00:59
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#4 | |
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Registered User
Join Date: Sep 2009
Location: Norway
Posts: 1,715
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Quote:
 But thanks, those will be the first two I change out
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10 September 2009, 05:56
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#5 |
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Precious & fragile things
Join Date: Feb 2009
Location: Victoria, Australia
Posts: 1,946
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Another person in another thread had exactly the same issues, after the caps, replace the op amp if still no joy.
Paul |
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10 September 2009, 22:51
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#6 | |
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Moderator
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Location: Eksjö / Sweden
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10 September 2009, 23:04
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#7 | |
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Global Moderator
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Location: Sidcup, England
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