[sdiy] Weird JX3P midi behavior

[Richie Burnett]

If it's transmitting MIDI garbage and not receiving properly I'd start by checking the clock frequency to the microprocessor. It sounds like it might be running at the wrong baud rate. I dont have service notes for the 3P at hand, but I'm sure someone can tell you what the MHz are meant to be.

-Richie,


Travis Thatcher <recompas at gmail.com> wrote:

>Hi Florian,
>
>I finally got back home and opened up my JX3P for further testing.  I
>tried all functions without the programmer hooked up and all worked,
>as well a switches/led's. Every panel seemed accessible. I checked to
>see if the switch was working by trying to write to the seq (it only
>works in the appropriate programmer mode). I also put an led on the RX
>test pin on the main board, with a current limiting resistor going to
>+5v. When I sent midi input into the jx the led lit up so it appears
>the opto coupler is functioning as it should. Again, when not switched
>to midi position the LED did not light.  Midi Thru does work.
>
>I did another test looking at the midi output of the jx in midi mode
>using MIDI Monitor. Here is what the output was when one note was
>pressed (first line of output generated) then released
>
>15:36:25.754	From MIDI Port	Note On	1	D4	1
>15:36:25.802	From MIDI Port	Note On	1	D4	1
>15:36:25.803	From MIDI Port	Stop		
>15:36:25.804	From MIDI Port	Invalid		1 bytes
>15:36:25.804	From MIDI Port	Clock		
>
>Any ideas on what to check next?
>T
>
>On Thu, Nov 8, 2012 at 10:15 AM, Florian Anwander
><fanwander at mnet-online.de> wrote:
>> Hello Travis
>>
>>
>>> 1. Midi out - note on events are only firing when you let up a key. No
>>> note off events are happening and nothing happens when you depress a
>>> key, only when you let off.
>>
>> Hmm, do the switches and LEDs on the panel work, as they should? Can you
>> edit every parameter from the panel? (disconnect the programmer for this
>> test!).
>>
>>
>>
>>> 2. Midi in - not responding at all to midi input
>>
>> Memory protect switch in the wrong position or broken.
>>
>> Florian
>>
>> --
>> http://fa.utfs.org/
>
>
>
>-- 
>http://www.travisthatcher.com
>http://www.soundcloud.com/travisthatcher
>http://voiceofsaturn.blogspot.com
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