Hello, find below the measurement results:
SG1: 17,4Mohm or 18,5Mohm depending +/- or -/+ measurement (in circuit).
SG2: 17,5Mohm or 18,6Mohm depending +/- or -/+ measurement (in circuit).
SG3: 17,3Mohm or 18,4Mohm depending +/- or -/+ measurement (in circuit). SG3 itself measure O.L. when soldered out.
PTC1: 1,62 Kohm (in circuit).
PTC2: 1,51 Kohm (in circuit).
By the way, it was not so convenient from buyer and seller:
- The seller sold it as "it works" and she sold it for a deceased family member. She could have told better "working unknown".
- I should have asked more in detail what works and what was tested.
No problem, learn process for seller and buyer
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
And hopefully it can be fixed.