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Old 17 July 2020, 11:10   #101
rvctech
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Quote:
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
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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
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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
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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
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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
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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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Old 29 November 2020, 05:48   #108
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Hi Guys,

Don't suppose anyone knows anywhere selling the 23pin d-sub connectors and A600 power connectors?

That aren't charging rediculous prices for them
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Old 29 November 2020, 10:57   #109
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Hi Guys,

Don't suppose anyone knows anywhere selling the 23pin d-sub connectors and A600 power connectors?

That aren't charging rediculous prices for them
I only know of icomp.de, who sells all necessary connectors.

They aren't cheap, though. But I think the other possibility (buying a defective board off ebay and desoldering the stuff) isn't cheap anymore either.
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Old 29 November 2020, 11:05   #110
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Eek

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Originally Posted by torsti76 View Post
I only know of icomp.de, who sells all necessary connectors.

They aren't cheap, though. But I think the other possibility (buying a defective board off ebay and desoldering the stuff) isn't cheap anymore either.
Cheers.

Thats the only place i could find them but the price is rediculous by the time postage is added its over €40 for one of each db23 and one power connector i dont mind paying a reasonable price but that is just plain greed to me.

Looks like i may end up having to bite the bullet though as i cant find them anywhere else
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Old 29 November 2020, 11:10   #111
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Cheers.



Thats the only place i could find them but the price is rediculous by the time postage is added its over €40 for one of each db23 and one power connector i dont mind paying a reasonable price but that is just plain greed to me.



Looks like i may end up having to bite the bullet though as i cant find them anywhere else
Yeah, I know. I once bought a complete chipset for the 1200 from them...
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Old 29 November 2020, 11:13   #112
Ceason87
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Yeah, I know. I once bought a complete chipset for the 1200 from them...
I bet that was a small fortune going by the prices ive seen for connectors on their site
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Old 30 November 2020, 14:19   #113
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I'd test with composite output first and also look around at a few photos, some of the parts installed on rev2 retail boards don't match what was listed in the schematics. Ones I have noticed are capacitors and resistors near Agnus (and also E199 sometimes has a resistor).

There's very little difference between 2B and 2D boards, best I can tell is U49 was added and SOIC footprints made longer which resulted in some routing differences.

Last edited by Mick; 30 November 2020 at 14:28.
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Old 30 November 2020, 15:25   #114
Ceason87
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I'd test with composite output first and also look around at a few photos, some of the parts installed on rev2 retail boards don't match what was listed in the schematics. Ones I have noticed are capacitors and resistors near Agnus (and also E199 sometimes has a resistor).

There's very little difference between 2B and 2D boards, best I can tell is U49 was added and SOIC footprints made longer which resulted in some routing differences.
Cheers Mick ill bear it in mind.

Dont suppose you would be interested in testing a board if i sent you an unpopulated one?
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Old 30 November 2020, 20:35   #115
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https://www.soigeneris.com/ and https://www.retronicdesign.com/ have teamed up to produce DB23F connectors, only cable type as far as I know not PCB mount and they wont be cheap but it's good to have another supplier.
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