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Anatomy of a CX500 Cdi unit

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AshimotoK0:

--- Quote from: Trigger on October 09, 2017, 09:35:52 PM ---As I have said before mate, if it can be built before, there is no reason why it can't be built again.
But, why do they go wrong in the first place? must be room for improvement  ;)

--- End quote ---

Well mine was never potted properly at manufacture so water had crept in and got exposed to the bare PCB.  What I didn't want to do is buy one second hand like RGP750 did for over 100 quid  only to find it doesn't work or may die soon after installation because the components are nearly 40 years old. Now that is hassle and wasted effort in  my book.

mike the bike:
The pcb is made from an insulating material such as fibre glass or synthetic resin bonded paper, with a thin film of copper bonded to one or both sides.  The pcb above is single sided.  You know the rest...

Bryanj:
 Oddjob did a small amount of PCB work at college and you paint on a protector to keep the tracks you want and etch the rest away

AshimotoK0:
The copper hasn't became detached, it's the epoxy resist resist that's come away and the copper 'foil' is still fully bonded on that PCB in most areas. Once I have finished with that PCB it will be nearly as good as new. The board I always use is FR4 epoxy-glass, 1.6 mm thick. Bonded paper PCB etc is used in cheapo appliances/audio etc and the last time I used it was when I was a kid. FR4 is pretty cheap these days. It comes pre-coated with UV sensitive emulsion so that you can print your design on laser film and use the 'contact' method (like photography) to make your own quality prototypes.
I can get 'Gerber' files done on CAD for that Hitachi CDi PCB  so that the board could be reproduced easily but no real need for me personal at this point. 'Gerber'  files are the manufacturing files you would give to a PCB manufacturer (a bit like the machining numerical  files you would give to a CNC company). I get PCB's made all of the time but I rarely make my own these days. Once the Chinese got into manufacture it became mega cheap with very low tooling costs even for multi layer 'plated through' boards. Funnily enough though I taught the young lad where I work to make them only last week, as I felt I needed to pass on the skills and my own kids aren't interested at all in any of my tech stuff.... I am a lovable anorak to them too.  :)

mike the bike:
Best get to grips with single sided boards first.  Double sided boards are more involved in that to make contact between the two sides, you either need PTH (plated through holes), which are beyond the scope of most hobbyists,  or solder short pieces of wire between the layers.

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