Yesterday I received CIF FT 02 reflow oven, made in France.
As Dave says, I took it apart even before switching on
Seems that controller was designed by team of trained monkeys (or maybe just monkeys
). Using quality parts, they built utterly dangerous device. Not like Chinese who do it to make chap crap but just because of insane stupidity. Frankly saying it is a first time I see something like that. I say right away that DANGEROUS
design flaws start from the middle of the post, first half is just teardown photos with small description. There are links to the high res version below each image so you can see in detail what's going on.
Oven with top cover opened.http://i.imgur.com/tQFCmsL.jpg
Top cover with quartz heat lamps.http://i.imgur.com/jb95zP2.jpg
PSU made by Artesyn, model NAL40-7612http://i.imgur.com/JenxsvC.jpg
DG409 analog multiplexer
AD595-AQ thermocouple amplifier in ceramic package
TLC1549 10 bit ADC
SSR: Crydom PF240D25 - drives 2 kW of load.
JQ1a-12V-F Panasonic relay
Two MAX232 and DB9 connectors are not mounted, should be used in bigger model which has com port.
LCD is 16x2 but very big.http://i.imgur.com/uyaSi9K.jpg
Controller, bottom side.http://i.imgur.com/nwqRfeq.jpg
They screwed with crimp connectors, changed all of them. They are Molex BTW. They used those meant for thinner wire.
Have not right connector? Let's cut what we have http://i.imgur.com/4Mtz8xN.jpgHere is starting the most interesting
See bright squares around the pads, that is creepage distance between mains and GND.http://i.imgur.com/Ht4LUUY.jpg
Creepage might be ok on bottom side if there wasn't that
circle. Why it is there? My guess as yours. To fix this madness and better show whats going on, I removed SSR, relay and connector. http://i.imgur.com/LCL7hIU.jpg
But this is just insane. Who in sound mind would fill ground around pads directly connected to the mains. Creepage is only about 0.3 mmhttp://i.imgur.com/rnVDafr.jpg
As ground is filled all across the high voltage traces I decided to just move all mains connected parts out of the board.http://i.imgur.com/AxaiHC9.jpg
Safety fix almost completed, need to tie the wires. Drilled 3 holes, mounted solid state relay and terminal block. Then rewired whole thing.http://i.imgur.com/P136dWy.jpg