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Messages - DrSnuggles

2
Project logs / Re: Really universal soldering controller
U1 has 0,1V and dropping between Vin and Ground and Q1 has a small hole I did not see the first time.
Measured Q1 in diode mode while the device is powered down:

positive probe on 1 gnd on 2 : 0,63V
gnd probe on pin 1 positive on 2: 1,4V
gnd on pin 2 and pos at pin 3: 0,84V

Q1 is gone isn't it?
3
Project logs / Re: Really universal soldering controller
J3 is completely dead. Nothing on 3,3V or -0,6V I try to find out how I can find out how the darlington on Q1 works in the meantime.
You mean the LM2675M-3.3 Step Down on U1 right?
4
Project logs / Re: Really universal soldering controller
I found the schematic, it does not look much too complicated. So happy to have a device that features this.

What is the least amount of power I can feed the board while trace the fault back?
Can I Use a Lab Powersupply with grounding?

Thank you so much !


5
Project logs / Re: Really universal soldering controller
Oh well, I was soldering a lot of stuff and the tindie board went dead while doing so. I had the usb cable connected to my computer but have a plastic case. I first thought it would be the firmware again but there is something wrong with the power delivery. The whole station was never earthed.

Until my new display arrives:
Would the unisolder power on even without a screen ?
Where are good testing points to close in on the issue?


6
Project logs / Re: Really universal soldering controller
Quote from: afedorov on
What happened to your display? Interleaved rows at the bottom are definitely caused by physical damage. Regarding two column image shift - check Sparky's post here http://dangerousprototypes.com/forum/index.php?topic=7218.msg71563#msg71563


I damaged it a when I dissassembled the front because I bricked it. I uploaded the bootloader + firmware version first and then because I had said line, I uploaded the standalone over usb and bricked it.
The issue was there before that, even the rows at the bottom directly after I flashed the new firmware.  I will look at the board when I am home.

Could you recommend a display from aliexpress I can use to repair it?

Thanks!
10
Project logs / Re: Really universal soldering controller
I have some issues with the temperature and stuck in calibration.  The iron works fine besides that.
Since my 0,1 10 ohm resistor isn't here yet I took one with 5% (gold ring) and with 4 point measurement came to 10,476 ohm. I soldered the resistor into a connector I had laying around and stuck it into the frontside port between SenseA and Vout- as it is described in the guide.
Pressed the middle button for a time to get into the calibration menu. The R value is really moving fast. When I press the button long enough it eventually goes stable. I set it to 1047 because it is roughly 100 times the value since I couldn't get it to 1048.
The room temperature is accurate. I press the middle button for a long time again to get out of calibration mode.

I measured the temperature with a A class PT1000 and a MAX31865 chip based system and a 191 thermometer that came with the kit. Unfortunately the measured temperature is around 20-30°C under the temperature on the displayed on the Unisolder. I am using C210 original JBC tips.

How can I fix that?

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