Hi all!
I just found out that this is the better way to get help, rather than poor JPK getting bombarded with emails 🫠
I have finished my first MP573 build and am in the test phase.
After an initial hick-up with my TP2 -> V+ measuring being lower than ~24V, I have now fixed that help with Jean-Pierres help.
Now, the next issue seems to be the VTB1847 transformer not actually getting any power, because once I connect it I still get the exact same voltage from TP2 -> V+.
Things I've done:
- Double checked soldering connections
- Done a continuity test from the transformer wires to the circuit board
- Checked
Q4...Q6, R40...R47, C24...C29 (as found in another thread) - couldn't find any issues visually.- Checked the transformer resistances when unplugged. Readings below:
CARNHILL VTB1847 (unplugged) :- Yellow-Orange : 8 ohms
- Red-Brown : 7 ohms
- Blue-Green : 21.6 ohms
- Violet-Black : 21.5 ohms
I also measured the test points according to
this thread, here are the results:
A: 2.52V (expected 2.5)
B: 4.07V (expected 4V)
C: 22.3V (expected 22V)
D: 13.2V (expected 13.3V)
E: 2.0V (expected 2V)
F: 12.6V (expected 12.7V)
G: 0.4V (expected 0.9V)
H: 1.10V (expected 4.2V)
I: 0.35V (expected 0.35V)
J: 0V (expected 3.6V)
K: 0V (expected 22.3V)
L: 0V (expected 3V)
So it seems G, H, J, K, L are causing issues potentially
What else should I try next?
Best
David
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