xoxbox receiving sync just in midi thru port

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chemie
 
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Joined: Tue Jan 27, 2015 4:07 pm

xoxbox receiving sync just in midi thru port

Post by chemie »

Hello everybody,
want to submit my strange (or maybe not) case:
my x0xb0x receives sync just when the midi cable is plugged into the Midi Thru port (cable coming from the midi out of my midi interface). If I plug it in the Midi in, it does not react (no sync, no midi notes).
Midi out port works perfectly.
Any suggestion? Is it normal?
Thank you in advance!

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mmm
 
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Joined: Tue Apr 24, 2012 1:51 am

Re: xoxbox receiving sync just in midi thru port

Post by mmm »

This can happen if the input circuit behind the MIDI In port is not working correctly.
There could be various reasons: The opto coupler not working, a problem with Q50 or perhaps the following:

http://ladyada.net/make/x0xb0x/fab/ioboard/index.html

Quote:
Note: in batch #6 we've started to notice that the optoisolators are possibly made to a different specification. If MIDI out and MIDI thru are working but MIDI in is not, try upping R16 to 120 or 150 ohms!
If you built the xoxbox yourself this might be worth a try.

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chemie
 
Posts: 2
Joined: Tue Jan 27, 2015 4:07 pm

Re: xoxbox receiving sync just in midi thru port

Post by chemie »

Thank you. Unfortunately bought it already assembled (2nd hand).
Will contact a tech center for solving this issue.

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