The second one would look great on my lounge wall. Interesting use of colours.
Looks like the night map on my sat nav
I'm still on a dog-eared A to Z, but to us, art can appear in the most unexpected places.
The second one would look great on my lounge wall. Interesting use of colours.
Looks like the night map on my sat nav
Yes. Photographed the bottom of the PCB & mirror imaged it. Using a 2 monitor setup, that image was always on one monitor. Then I visually copied the top tracking and at the same time making the schematic - if the schematic did not match the tracking then an error would appear, hence IF my PCB tracking fully matches the original PCB then the schematic should be correct. This was also confirmed using a continuity tester.Well I'm impressed.
Did you start off by photocopying the board?
True, but I did not change the inherent design of the controller. I have only copied it (out of sheer boredom).It helped me to replace a 50p capacitor instead of spending £100 on a new PCB and now my water is hot, house warm. Also I was bored, stuck in doors with man-the-fk-up flu. No, I'm not an RGI and hence no Gassy type things were touched.
...except, of course, the small issue that the PCB controls the gas valve, and the fan (which affects combustion) and the flame rectification etc etc, so technically gassy type things were most definitely touched
What stood out about this design after completing the schematic was the utter lack of ESD protection. A lot of processor pins are simply tracked straight to connectors thus wired to the outside world, snaking off to wherever! AND the design has an on-board ESD generator, the circuit used to fire the spark electrode! So, IMO, this design could be improved upon really.cannot get the image up on the lap top ? but
Is this one of them in-famous symsi pcb's an example of carp electronics dumped into boilers by some manu
Symsi is probably some word that translates or means "Turkey" ???
power cut symsi can go t*ts up , turn the fuse spur off symsi can go T*ts up
Breathe on it symsi can go T*ts up etc etc
Gloworm should get an award the "electronics turkey award" along with Johnson & Starley for the Reno carp & the legendary potty suprima pcb
A picture is worth a million words... or rather a schematic. Having a schematic to hand is a must for fault finding beyond the obvious.Impressed
So how did doing the drawing help you find the fault. Did you know the logic of the board, what does what and when, to enable you to find the fault. How did you test it.
Electrical & electronics engineering, man & boy.very good
what is your back ground i.e do u work in electronics or ??
interested
So, given your obvious experience and ability in electronics design what's your opinion on these boards, considering the cost of them and the cost of the boilers they're fitted in?
Would it cost the makers much per board to bring them up to a reasonable spec in your opinion, or do you think that most boiler repairers suspicions that they have been designed to fail are not too far off the mark?
Indeed. My point was that it consisted of a string of SURFACE MOUNT components across 350V. A failure in any one of them would avalanche them all to fail. In other words I do not see much consideration for failure modes in these designs as you have also pointed out - leading as you say to catastrophic failure in some instances.The series string of resistors across the mains is to short out cap C3 when the boards powered off....otherwise 340 VDC would make the repair eng jump a bit
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