Some interesting update from my soldering station.
I added 1Meg pullup resistor between TC input and 3,3V rail. Now everything is working fine as far as NO_IRON detection is concerned. With no IRON connected to the station this 1Meg resistor take 3,3V to the OP-Amp input saturatung it and letting the firmware detecting NO IRON is plugged.
This same 1Meg resistor seems to not affect in any way the station when you plug an Iron, whether T12 or C245. With T12 jumpered as expected from TC to HEATER you still has NO_IRON when no TIP is inserted, while inserting a tip just start the PWM as it is supposed to do. Same with C245, NO_IRON with no TIP and normal working inserting one (without any resistor in C245 GX connector).
Calibrated temperatures don't seem to be affected by this 1Meg resistor but still I have to take some precise and objective measurements.
Let's now talk about C245 and my 72W power supply. Actually my PSU is not a Quicko but a Ksger and has two 1000uF capacitors on its output. Lowering the station power doesn't help much in my case and at the end I let it set at 80W both for T12 and C245. But I found a way to be able to use my PSU with C245, even if temperature rising is obviously not as short as 3 or 5 second of a JBC station. Experimenting a bit, this is what I noticed. Setting the station to a high temperature, like 450°C and Power-on setting on RUN is the worst situation. When you power on the station it keeps restating, no way until you power it off, unplug the tip (or the cable) and power it on again.
Setting the station to a low temperature before powering it on can make C245 work. Not much current request right from the start let it power on as it should. Then you can rise the temperature up to 450°C with no problem. Just be aware (and I don't mind at all) that from cold to 450°C takes about 25 seconds.
NOW the real news about this issue. If you set the station to always start on sleep mode, even with 450°C previously set, when you push the encoder to exit from sleep everything works FINE, NO STATION RESTARTS, even starting from a cold C245 TIP (same 25 seconds to get to 450°C).
Conclusion is that maybe many issues of such kind could be solved even with the station set on Power-on RUN mode by letting it go through a little "sleep time" before starting PWM output.
Just one last note, if I manually set the station on sleep, when I insert a TIP it automatically exits from standby. I don't know if I like it. I think manual sleep should override every other automatic run mode. Manual sleep only exit by manual Run. At least for C245 handles that doesn't have a shake switch to care about. Two way of changing tips.
1 - Manual sleep, change tip, manual Run
2 - Station running, extract tip, insert new one and automatic run.
Always long posts from me, sorry
Attached my new 1Meg Mod (in R11 place with a white wire to 3,3V).