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Old 01-20-2021, 01:30 PM   #41
redwire
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Default Re: KSGER STM32 T12 soldering stations

Check the handle and its wiring. The shake switch can be installed upside down or wired wrong and it picks up noise.

Here is the schematic for your KSGER 24V power supply at post #3.

I doubt anything is wrong with it (PSU), aside from grounding. The 24VDC(-) should connect to earth ground for safety and noise.
The newer OLED-V3.0, OLED-V3.1 controller boards have an extra GND pad where you can solder a wire to, and then connect to a GND on the metal enclosure and IEC connector.
That also might fix the shake switch problem, if it is due to noise.

Last edited by redwire; 01-20-2021 at 01:33 PM..
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Old 05-04-2021, 06:49 AM   #42
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Default Re: KSGER STM32 T12 soldering stations

Hi, I would like to replace the three capacitors of my KSGER T12's PSU. Don't trust the cheap chinese Chongx caps after hearing stories about leakage and "exploding" soldering stations after ten months use...

- 1x ChongX VEHT, 82F, 400V, diameter: 16mm, height: 25mm (not much room to the sides and top)
- 2x ChongX VEHT, 1000F, 35V, diameter: 10mm, height: 20mm

Which ones should I use? Can't find a datasheet for ChongX caps and unsure about ESR and ripple values.
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Old 05-04-2021, 10:25 AM   #43
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Default Re: KSGER STM32 T12 soldering stations

for the 1000uf caps, can you fit 12.5mm diameter??
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Old 05-04-2021, 12:20 PM   #44
redwire
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Default Re: KSGER STM32 T12 soldering stations

Primary cap was 68uF 400V 16x26mm and KSGER increased to 82uF. I couldn't find any 82uF 16x26mm caps at 400V. The heatsink and Y-cap are near it, so 18mm dia. would be really tight and hit the Y-cap. One problem is the low height, maximum 27mm. It must be a laptop brick cap. I have Ltec there.

The two 1,000uF 35V 10x20mm caps could go taller.
I think you could barely stuff in 12.5mm dia. parts, one cap has SMT resistors nearby. I have green Sanyo there.

Because the PSU is only under full load 3A for short periods, the caps are not highly stressed I think and ESR not so important.
The mains fuses are way too big, so if the mosfet shorts, many parts get damaged first and better off to throw the PSU in the garbage than try fix it.
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Old 05-04-2021, 12:24 PM   #45
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Default Re: KSGER STM32 T12 soldering stations

panasonic FS 10x25 for the 1000uf 35v
Attached Files
File Type: pdf FS.pdf (74.9 KB, 11 views)
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Old 05-04-2021, 12:32 PM   #46
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Default Re: KSGER STM32 T12 soldering stations

if you drop to 68uf on the mains then chemicon EKXJ401ELL680ML25S
https://docs.rs-online.com/a51d/0900766b81086edc.pdf
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Old 05-04-2021, 02:07 PM   #47
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Default Re: KSGER STM32 T12 soldering stations

Quote:
Originally Posted by stj View Post
panasonic FS 10x25 for the 1000uf 35v
Thanks! Now the big one, please.
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Old 05-07-2021, 08:13 AM   #48
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Default Re: KSGER STM32 T12 soldering stations

I have the 7 segment display version of this iron. I like it a lot but I did have to re-wire the new handle I bought that was originally intended for the KSGER T12.
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