Hakko FX-951 Clone: Further tests & circuit analysis

Followup-video to this one:    • A Hakko FX-951 Clone: Teardown & Reve...  

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Additional info: It looks like the thermo-couple integrated in the tip is not a Type-K but a Type-N, which has a lower sensitivity.
That explains the measured sensitivity and the unlinearity/offset at 200°C and 350°C. It´s in perfect agreement with the published sensitivity when the unlinearity is not taken into account by softare.
Some more tests, comparison to original PCB, circuit analysis and ideas for simple improvements.
Related videos:
Original teardown:    • A Hakko FX-951 Clone: Teardown & Reve...  

Genuine Hakko FX-951 teardown from jwrelectro:
   • #15 - Hakko FX-951 Soldering Station  
Additional info/files from jwcelectro for the FX-951:
http://tigermultimedia.com/hakko-fx-9...
Schematics & Datasheets of the fake FX-951:
https://www.kainkalabs.com/upload/ind...

ATTEN AT-80D reverse-engineering + fixing the problems:
   • ATTEN AT80D Soldering Station: Fixing...  

Support Roger on Patreon!
  / kainkalabs