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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 25, 2013 3:29 pm Post subject: |
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Ok, here's what your going to need to do. Hope you have your 15 dollar radio shack desoldering iron handy.
You need to swap ic602 with ic601 and see if the screech moves again or stays. You can put C631 back in also.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Jul 25, 2013 3:29 pm Post subject: |
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I figured that's what we were doing. If it is, I have about 4 spares from parts units 
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Jul 25, 2013 3:30 pm Post subject: |
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| macgyver655 wrote: | Ok, here's what your going to need to do. Hope you have your 15 dollar radio shack desoldering iron handy.
You need to swap ic602 with ic601 and see if the screech moves again or stays. You can put C631 back in also. |
RadioShack? Never! I have a Tenma station and a "xytronic" station.
I DO have standards when doing this ya know 
And will do mac.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 25, 2013 3:32 pm Post subject: |
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Oh, if you have spares then just change out ic602 and see what happens.
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Jul 25, 2013 3:46 pm Post subject: |
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gotcha 
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Jul 25, 2013 3:46 pm Post subject: |
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Also it does look like it got hot, the area of the board its soldered to is really dark compared to the other 3 STKs
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Jul 25, 2013 8:07 pm Post subject: |
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Well mac, the STK isn't the issue unfortunately. so with that out of the way, whats left?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 25, 2013 11:33 pm Post subject: |
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Do you have extra caps of these values?
2) 220uf/10v or slightly higher voltage.
2) 10uf/50v
2) 47uf/25v
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Jeremy112
Joined: 28 Sep 2006
Posts: 2649
Location: Fond du Lac, WI
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| Posted: Thu Jul 25, 2013 11:42 pm Post subject: |
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yep I have all of those
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jul 25, 2013 11:46 pm Post subject: |
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Change out these caps:
C622, C627, C631, C636, C670 and C665.
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