Really universal soldering controller

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Re: Really universal soldering controller

Postby Doomedahab » Sun Dec 02, 2018 7:07 am

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?
Last edited by Doomedahab on Sun Dec 02, 2018 2:30 pm, edited 2 times in total.
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Re: Really universal soldering controller

Postby Doomedahab » Sun Dec 02, 2018 1:39 pm

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
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Re: Really universal soldering controller

Postby Morpheus1979 » Sun Dec 02, 2018 2:06 pm

Glad to see you've solved the issue and do have a working UniSolder station now.
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Re: Really universal soldering controller

Postby Doomedahab » Sun Dec 02, 2018 2:33 pm

Morpheus1979 wrote:Glad to see you've solved the issue and do have a working UniSolder station now.


Thanks Morpheus, it's enormously satisfying to have made it. Next project is a nice case, along the lines of Tony's work.
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Re: Really universal soldering controller

Postby talkos » Mon Dec 03, 2018 1:49 pm

Phyllomedusa wrote:Hello all together,
I had been reading the topic for quite a whiel and finally took time to finish my Unisolder.

First of all I validated the main PCB and checked voltages and they were fine.
Then I checked resistances and the Front PCB and finally that is fine as well as it seems. I just had a tiny bridge unter U15 and therefore a lower Resistance on SCL, but fixed that.

Programming was fine as well, but I have some trouble with the Display and would like to ask you around before I start to change IC's or so.
I was just running the Front PCB powered by Pickit3 and then attached the Power PCB as well, just to check. I did that beacuse I didn't want to risk frying anything (in fact I already fried a PIC on anothe runisolder build because I tried to debug it while powered).

+The PCB seems to reboot constantly (could be power limitations from Pickit I guess)
+ The OLED only shows some noise:
-I already rechecked the solder joints around U9 (the bridges, U9 is not populated
-I checked with another OLED Module and it behaves the same way
-I think the FAN 5331 is fine as both modules show this error

Does anyone have any other suggestions? I attached a Photo for you. Thanks a lot, especially for Sparky and Afedorov for developing and helping so much in this topic.

PS: Yes, the PCB will be cleaned of course...



I had a similar problem, and she decided to correctly unpack the wires to the display
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Re: Really universal soldering controller

Postby talkos » Mon Dec 03, 2018 2:00 pm

This is my first project of such complexity and I learned a lot here thanks to the creator of this engineering miracle
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Re: Really universal soldering controller

Postby bjornsundklakk » Mon Dec 03, 2018 11:42 pm

Hi!

I have drooled up and down this project as I intend to build a couple of the Unisolder 5.2.
I have a couple of PCB`s with sensors, and I`m waiting for the parts to come. I`v ordered from Digikey and Comet. I guess I`m a little late, but i will post for help here and I hope someone will still answer.
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Re: Really universal soldering controller

Postby max0o » Tue Dec 04, 2018 2:29 am

minkok wrote:
max0o wrote:[...] Unfortunately it shows only 1023 as the ADC value in the calibration submenu. I already tried to resolder the solderjoints of all the ICs in this region in order to make it less likely that it is a problem of a bad solder joint.. unfortunately no success, still 1023 :/

Any ideas what might be wrong?

Best regards

If I can understand you, rotating RC2 does not change the value of ADC. In that case measure the Vtemp the time of rotating RC2 and look for changing its value. It will give a direction where to look for, before or after that point and will short the search.


I tried to measure afedorov's voltages on page 139 with some success, some voltages seemed correct while others were heavily fluctuating - but I guess that's maybe because of a layer of flux residuals which leads to a bad connection to the tips of the multimeter. So I guess I might have to repeat that if I can get hold on some better equipment with finer tips.

Then I tried your approach and measured Vtemp while rotating RC2. This seems to work, I can change Vtemp in the range of 2,x - 3,x V (not sure about the exact voltages, did that a couple of days ago and I had only two hands available for the PCB and the two tips ;)). Is that somewhat correct or what should be the voltage range of Vtemp adjustable by RC2?
Then I assumed if Vtemp seems good then it could be some problem with the bus. But all pins of U15 seem to be soldered just fine as well as all other SCL/SDA pins. I'm not so sure what the problem could be when the analog part seems to be working and the corresponding IC also..
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Re: Really universal soldering controller

Postby minkok » Wed Dec 05, 2018 1:21 am

max0o wrote:Then I tried your approach and measured Vtemp while rotating RC2. This seems to work, I can change Vtemp in the range of 2,x - 3,x V (not sure about the exact voltages, did that a couple of days ago and I had only two hands available for the PCB and the two tips ;)). Is that somewhat correct or what should be the voltage range of Vtemp adjustable by RC2?
Then I assumed if Vtemp seems good then it could be some problem with the bus. But all pins of U15 seem to be soldered just fine as well as all other SCL/SDA pins. I'm not so sure what the problem could be when the analog part seems to be working and the corresponding IC also..

Hello max0o, you go in right direction, if Vtemp is ok, you have to check soldering of U11, U15 and U17 and corresponding components, if all of that is ok, repeat the same measure of output 6p/U15 or +in 3p/U17 (which one is easier to get), when you turn RC2 (it is digital pot of 40k-60k with less value than Vtemp, depending of value defined by I2C ). Check 8p/U15 for 3.3V and (1,4 and 7)p/U15 for a GND and if Vtemp goes to 5p/U15.
I cannot give to you the right value of Vtemp in that aligning mode, if there is someone with still disassembled, but working Unisolder to measure it and to give it to you.
It will be a help for others also.
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Re: Really universal soldering controller

Postby max0o » Wed Dec 05, 2018 2:14 am

Thanks for your input, I'll do that!
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Re: Really universal soldering controller

Postby max0o » Sat Dec 08, 2018 11:42 am

Hi minkok,

I got hold on better equipment and I was able to measure all the voltages of page 139 as well as the one you mentioned, with the following results:

Always should voltage/measured DC voltage:
U15:8: 3.3V / 3.24V
U15:1/4: GND / 0V
U15:5: 3.124V (independently of Rc2)

Page 139:
U14:2 2.1V / 2.0V
U12A:3 2.7V / 2.6-2.7V
current through calibration resistor ~380uA, so, voltage drop on it 3.8mV: 0mV !!
U16A:2 3.8mV / 0.68V !!
U18B:5 3.8mV / 0.68V !!
U18A:3 0V / -0.001V
U13A:1 106mV / 3.22V
U17:3 53mV / 1.547V !!
U17:6 1.5V / 3.186V !!

So I guess I have an new problem, the previously working current through the calibration resistor is not existing anymore! Any idea, what might be wrong? If I turn off the PCB and measure the resistance between the sense A and the Vout1- pads, I get the correct 10 ohm.

I guess the measurements above which are way off are to be expected if there is no current through the calibration resistor?

Also I double checked the SCL/SDA pins on all ICs. All have 1.8kOhm to the 3.3V net, which is exactly as expected since it is the pull up resistance. Also there is no short between SDA and SCL since I could measure 3.6kOhm between them (so 2x pull up resistance). So I guess that should definitely be okay.

Best regards
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Re: Really universal soldering controller

Postby minkok » Sun Dec 09, 2018 4:07 am

You should measure U15/ 1p, 4p and 7p if they are connected to GND
You should measure U17/ 3p – already given from Afedorov – 53mV – if it varies the time you turn RC2
If you have physically connection from U15/ 5p to R56
You already have Vtemp, given from Afedorov voltage table U13A:1 106mV and you have big difference 3.22V
Now you have different problem:
If you said, you lost current through calibration resistor, you have 2 possibility:
1.Lost GND from Vout1-, you can check by measuring if you have the same voltage to both ends of calibration resistor- can start by measuring HSEL – needs to be low logic level to open Q10
2. lost the supply voltage from SENSEA – you have zero voltage to both ends of calibration resistor- you need to check U10, U12 soldering and surrounding components.
When measure SDA and SCL is better to check connection by conductivity – U10, U11 and U15 – all SDA pins have to be shorted together and to R28 pullup, the same and with SCL – to R27. I prefer that, than resistance measurement. And to work properly they need to have different addresses corresponding to sparkybg firmware.
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Re: Really universal soldering controller

Postby Doomedahab » Sun Dec 09, 2018 5:56 am

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?
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Re: Really universal soldering controller

Postby afedorov » Sun Dec 09, 2018 9:42 am

max0o, even if you have 0V drop on the resistor, your original problem still exist. There shouldn't be 0.68V on U16:2, it's way to high and it's causing all the following checkpoints to overflow. It may be due to leakage from U16:1>U16:2. Did you clean flux residue?

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.
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Re: Really universal soldering controller

Postby Doomedahab » Sun Dec 09, 2018 10:21 am

afedorov wrote: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.


35v on the emitter of q1, no detectable heat at r20
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