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Old 17 July 2020, 11:10   #101
rvctech
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Originally Posted by Rodeo View Post
2 of my boards was in bad shape but repairable. Leakes makes them weak thats a reason for pad loss etc that happens when unexperienced people repairs ??
Hi Rodeo,

The leaks don't usually make the pads weak although I have seen this after a very long period of exposure. When working on a PCB, pads will normally de-laminate from the application of excessive heat. Inexperienced repairers often apply excessive heat or leave the iron on the pad for too long because they are having difficulty removing the part. I have seen many "re-cap" attempts that resulted in lifted pads. It is very easy to cause this type of damage.

It is possible to repair de-laminated pads and tracks, I have done this after receiving boards with lifted and missing pads (due to bad repair attempts). It is quite a bit more work though.

The epoxy between copper pad and FR4 laminate can sometimes only tolerate a limited amount of heating cycles and can also become weaker from excessive heating/re-work cycles.
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Old 17 July 2020, 16:41   #102
Mick
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Did Ian Stedman have any luck with the board he was working on?
I'm presuming not, it was probably a noise/impedance/resistance issue or something. That was the old version anyway the new one is pretty much routed by Commodore so all of those things should be okay, if someone wants to volunteer to build one I might be tempted to spend yet more money on PCB's but I'll probably find another PCB place as the last batch had scratches and other visual imperfections.
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Old 15 October 2020, 15:40   #103
Ceason87
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Hi Guys,

Just thought I would give a quick update and let you all know I have had some PCB's manufactured from Mick's KiCad Design and am going to try getting all new parts where possible and try and see if it will function as intended.
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Old 16 October 2020, 17:04   #104
Mick
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Hi Guys,

Just thought I would give a quick update and let you all know I have had some PCB's manufactured from Mick's KiCad Design and am going to try getting all new parts where possible and try and see if it will function as intended.
Which one?
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Old 17 October 2020, 15:19   #105
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Which one?
The A600 rev 2B
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Old 17 October 2020, 19:01   #106
Mick
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The A600 rev 2B
The only problem with it is something I noticed only recently in that the DAC has a copper keepout area for ground.

Last edited by Mick; 17 October 2020 at 19:35.
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Old 18 October 2020, 02:13   #107
Ceason87
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The only problem with it is something I noticed only recently in that the DAC has a copper keepout area for ground.
Visually its the same as my rev 1.5 board that my mate gave me to replace the 1 that they broke so hopefully it will work fine when i transfer the ic's over as im going to fit all new caps and resistors etc.
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