MIDI out problem SOLVED

midi2 · Post by **midi2** » Fri Dec 02, 2022 1:15 pm

Hello
i have problems
There is no any reaction to the midi out from korg triton studio. I have 3 midi interfaces: with esi m8 - problem, with china Midiman - problem.
Only If I connect korg directly to another synth or to another midi interface (m-audio), everything works normally.

I see with OSC on studio out

max is 32V

an on triton extreme out - works fine with any midi interfaces

max is 50V

Any idea?

midi2 · Post by **midi2** » Fri Dec 02, 2022 4:20 pm

On studio midi out - 3.3V
on triton extreme - 4.8V

midi2 · Post by **midi2** » Sat Dec 03, 2022 3:39 am

main question - is it normal for triton sudio and esi m8?
or did they broken something on the midi out?

midi2 · Post by **midi2** » Sat Dec 03, 2022 7:39 am

checked thru - also a problem
74hc05 died?

midi2 · Post by **midi2** » Sat Dec 03, 2022 2:40 pm

I was told how to measure the midi signals themselves
this is Yamaha PSR, also 3.3V

Thiы is my buggy triton studio

As far as I see, the amplitude of the pulses is smaller and the signal fronts are rounded. Looks like a hardware problem

midi2 · Post by **midi2** » Mon Dec 05, 2022 4:32 pm

The original piece of the input, output and tru midi scheme in the classic triton was powered by 5V.
This piece of the scheme migrated to the triton studio unchanged, but was already powered by 3.3V
that is, it is a problem of Korg design
as a result - lack of current in the circuit

replacing R15, R17 resistors with 20 ohms helped solve the problem
now all midi interfaces see messages from triton studio without exception

bpoodoo · Post by **bpoodoo** » Mon Dec 05, 2022 7:12 pm

Good job of diagnosing and fixing the problem!