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Messages - Doomedahab

423
Project logs / Re: Really universal soldering controller
[quote author="afedorov"][quote author="Doomedahab"]35v on the emitter of q1, no detectable heat at r20[/quote]
So, if you're not getting 12V rail it's Q13 and D15 left only.
And disconnect the front board until you done back board repairing.[/quote]

Hi Afedorov, it's me again. I have re built a new back board from new components. Unfortunately, there is no 12v line on  this one either. I did have 3.3v and -600mv. I tried it on the front board, and now the 3.3v line died also. I really am at a loss. If we keep focusing on Q1 emitter, it is reading 32V. C7 is 3.3V, C8 too. D6 is 12.2V. The only difference between this board and the last is that I now use ftz705 instead of ftz605, which is basically the same part.
424
Project logs / Re: Really universal soldering controller
Yes, that is the pin that had 35v on it. I said had, because I am rebuilding the back board again. Something is very wrong and it's faster to do it like this. I had almost all parts available anyway.
425
Project logs / Re: Really universal soldering controller
[quote author="afedorov"]So, power to the 12V regulator is coming through plated hole of C8 and via near R19. There is nothing left, really.
And what about 3.3V and -0.6V on J3 - is it there?[/quote]

No, those voltages are absent as well
428
Project logs / Re: Really universal soldering controller
[quote author="afedorov"][quote author="Doomedahab"]35v on the emitter of q1, no detectable heat at r20[/quote]
So, if you're not getting 12V rail it's Q13 and D15 left only.
And disconnect the front board until you done back board repairing.[/quote]

Replaced both, no difference. Yes, I disconnected the front board.
429
Project logs / Re: Really universal soldering controller
[quote author="afedorov"]Doomedahab, it shouldn't do any harm no matter if your iron is grounded or not. Check the voltage on the emitter of Q1 and if R20 is heating up.[/quote]

35v on the emitter of q1, no detectable heat at r20
430
Project logs / Re: Really universal soldering controller
Ok, my back board died again. I wanted to fine tune my calibration so I soldered the 10 ohm resistor to SenseA and Vout-1. After calibration I switched off power but forgot to unplug the board. The switch is on the primary side by the way. I desoldered the resistor and after that the board is dead. There is only 1,3V on pin 6 and 7 of U2. I apparently fried something. What are the most likely candidates? Q10 I presume?
431
Project logs / Re: Really universal soldering controller
[quote author="Morpheus1979"]Glad to see you've solved the issue and do have a working UniSolder station now.[/quote]

Thanks Morpheus, it's enormously satisfying to have made it. Next project is a nice case, along the lines of Tony's work.
432
Project logs / Re: Really universal soldering controller
Solved it! It turns out that the red and blue wires are reversed in the knokoo handle. I started to suspect this after reading a similar issue on page 134, which was caused by a reversed wire. I just re-wired the connector and it's working now!! I can't believe it myself lol
433
Project logs / Re: Really universal soldering controller
So close now, yet so far... Calibration went ok I guess, but is it normal for the R value to quickly fluctuate +/- 3 points? On my device it does. I dialled it in so it fluctuates between 999 and 1001.

I powered the boards up with my jbc 245 (knokoo knock-off from aliexpress, genuine tips), and it gets recognized correctly.

But unfortunately, when I plug in the tip, the display only shows ambient temp and the heater is on at max 130w power permanently.  Because I had my finger on the switch as a precaution I powered off before the tip started to glow, so fortunately no damage.

What could cause this fault? Where to begin the trouble shooting?
434
Project logs / Re: Really universal soldering controller
[quote author="18minimus18"]Hello


Sorry to be a pain but is there a better Bill Of Materials file as I'm in the United Kingdom and im using Farnell and the file only verifies 13 components

and I'm wondering if it's been done properly at all

regards

andy[/quote]

The unisolder Github page made by a forum member here was of great help to me. It lists alternative parts for many positions and has lots of good info. You will however have to look up most parts manually as the bom is not on stock keeping unit level. Also, you will most likely not find all parts in stock at Farnell. Arrow currently ship for free worldwide with no minimum order value and they stock almost all needed parts. Between those two shops you should be able to order everything you need.

Edit: I recommend tme to source the transformer, they have several 24v, 120va options for little money.
435
Project logs / Re: Really universal soldering controller
A few pages back I posted about problems with the backboard,  which seemed to be solved at one point, but that unfortunately proved not to be the case. I decided to just start over again. So I ordered 10 sets of boards at jlcpcb, built a new back board, and this is the result. Next up: calibration. Wish me luck :-)

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