UPA USB V1.3 China Clone cant pass selftest in uuprog

[Luedy11]

Hey Everyone,
i have two UPA USb V1.3 China clones, both not working properly. I tried to bring at least one to work for weeks, but cant get any success.
There are two main-problems. First is the selftest, none of them will pass, mostly because P2 and P6 are way too high in Z-State. They sometimes pass most of the Z-State tests, but one of them alwys fails. If the Range ist x ... 4V for Z-State, P2 and P6 are between 3.9 and 4.1 for all testet P1-voltages. The latest Programmer i bought fails P4 at P1=0V with P4=4.04V (for 3.00V < P4 < 4.00V).
I Tried measunring and got datasheets most of the parts on the board, but my knowledge doenst seem to be be enough to find the mistake!

Second problem appears if i try to read a mcu (in my example mc68hc05b6) an "test the connection". Without MCU connected, he says "device not respond". If mcu is connected, he fails Pin 1 (IRQ) with way too low voltage.

So two questions: Is there a proper manual how to deal with this programmer? And are my problems selfmade due to false usage or is this actually hardware-realted?

I really hope, someone can help or even has a clue, where the problem can be.

P.S: I use the uuprog software, which came with the Programmer, I tried external power supply with 9V and 12V, as well as Power supply via usb only (with the jumpers set correctly).

Thank you all very much, even for reading the post

[tepSIJA]

https://www.youtube.com/watch?v=v3_5gZrnZd0&t=2s

[Luedy11]

Thank you very much! I already found that video and some threads with this solution. The newest version 1.3 ELRASOFT doenst have this little adustable capacitor and i cant find a equivalent one on the board. I already tried setting up a daughterboard with adjustable parts, but that only changed the overall voltage! My specific problem seems to be the way to high voltage in th Z-state! The other channels are arount 0 .. 0.2 volts, while P2 and P6 are very close or even over the high threshold.
Im not sure, wheter its a problem on the board (wrong or damaged components) or if its a problem with the usb-chip or the software.