DCC 170 with different PCB layout

Today i started restoring a DCC 170.
Never before, and I already have more than 10 players defective restored, I came across 1 with a different layout than standard. Someone who knows this version and can explain why the layout is different? I’m very curious. Could this be an early version or a developer version?
If you look very closely you see a small pcb on the original PCB board. I have never see this in other 170 or 175’s. Very curious what it is about.

Original on top.

Different layout

I think i already found it, but still not clear what it really is. Alway nice to know what is the difference and what else. :slight_smile:
Was this originally delivered this way or was it done by a repair?
Player works perfectly fine after replacing the belt. I have to test other things like recording, but just playing is fine.

Does it show the same FW version in service mode as usual DCC170?