Hi there all, I finished my mb64, uploaded application, everything fine, seems to send correctly controlers or notes, BUT :-/ many random events were displayed by midi-ox ! the funny stuff is that when tapping on the box it triggered them ???
So I figured it may be a grounding problem, so checked everything that needed to be grounded, and add a ground connection on the box (metallic one, my first elctronic natural initiative ;) is that allright ?). Still random stuff. One pot seems not to work, so I re-checked all my solder (these box end up in an electric spider-web no ?), nothing new, and this pot don’t work.
I just started the investigation, so what are the known sources of that problem ? I thought it could definitly not be a software issue. Do soldering issue are known for this ? The question is : can it be anywhere ? So knowing that I’ll concentrate on specific point.
Thanks to everyone experienced the problem for hints !
Hi there all, I finished my mb64, uploaded application, everything fine, seems to send correctly controlers or notes, BUT :-/ many random events were displayed by midi-ox ! the funny stuff is that when tapping on the box it triggered them ???
So I figured it may be a grounding problem, so checked everything that needed to be grounded, and add a ground connection on the box (metallic one, my first elctronic natural initiative ;) is that allright ?). Still random stuff. One pot seems not to work, so I re-checked all my solder (these box end up in an electric spider-web no ?), nothing new, and this pot don’t work.
I just started the investigation, so what are the known sources of that problem ? I thought it could definitly not be a software issue. Do soldering issue are known for this ? The question is : can it be anywhere ? So knowing that I’ll concentrate on specific point.
Thanks to everyone experienced the problem for hints !
Well, fixed some bad soldering, try the core alone with everything needed grounded, no weird data, core+DIN no problems, core+AIN bad. So I focused on the AIN and re-done the whole power wiring of the pot with more accurate connexions. Problem is worst ! it really looks like a ground problem but no way to get rid of it.
Well, fixed some bad soldering, try the core alone with everything needed grounded, no weird data, core+DIN no problems, core+AIN bad. So I focused on the AIN and re-done the whole power wiring of the pot with more accurate connexions. Problem is worst ! it really looks like a ground problem but no way to get rid of it.
So my case is whole metal and I’ve already grounded it.
My powersupply is a wall adapter set to 9V, the voltages I read on the Core test are all right 5V.
Measured tension on AIN power pins is 4,5V is that enough ?
It looks like its the AIN module that is faulty, I’m gonna check it with care today, but it all looks ok.
For info my problem changed from random timed events, to continuous random controller flow. I have read the whole troubleshooting section of the forum with  no luck, but it looks like it’s often soldering issues, so I’ll check that.
By the way the multiplexer I have are philipps HEF4051BP is there a special issue on this ? Is there a way to test them in case I fried one ?
Can the problem still be on the Core even if when I don’t connect the AIN (and ground what needed to) there’s no probs ?
So my case is whole metal and I’ve already grounded it.
My powersupply is a wall adapter set to 9V, the voltages I read on the Core test are all right 5V.
Measured tension on AIN power pins is 4,5V is that enough ?
It looks like its the AIN module that is faulty, I’m gonna check it with care today, but it all looks ok.
For info my problem changed from random timed events, to continuous random controller flow. I have read the whole troubleshooting section of the forum with  no luck, but it looks like it’s often soldering issues, so I’ll check that.
By the way the multiplexer I have are philipps HEF4051BP is there a special issue on this ? Is there a way to test them in case I fried one ?
Can the problem still be on the Core even if when I don’t connect the AIN (and ground what needed to) there’s no probs ?
new step, I found that when AIN and Core are connected but not the pots powersuply I can stop the data flow with my finger touching the case ! If the pots power supply is connected, no way to stop the data flow.
If its not a ground problem I’ll be damn, so I noticed that my power plug on the metal case, is made of metal also, could it be bad for grounding respect because one end of the power plug is in contact with the case ?
Everything look real fine on the two boards (will not guarantee but checked it very well).
Do you have a metal frontplate?
If yes, ground it (seperately from the box!).
What do you mean seperately from the box ? wiring my front plate with what ?
new step, I found that when AIN and Core are connected but not the pots powersuply I can stop the data flow with my finger touching the case ! If the pots power supply is connected, no way to stop the data flow.
If its not a ground problem I’ll be damn, so I noticed that my power plug on the metal case, is made of metal also, could it be bad for grounding respect because one end of the power plug is in contact with the case ?
Everything look real fine on the two boards (will not guarantee but checked it very well).
Do you have a metal frontplate?
If yes, ground it (seperately from the box!).
What do you mean seperately from the box ? wiring my front plate with what ?
If its not a ground problem I’ll be damn, so I noticed that my power plug on the metal case, is made of metal also, could it be bad for grounding respect because one end of the power plug is in contact with the case ?
defred
Yepp, thats some point…
you go through those diodes (the bridge recitifer) and so loose 0,7V. That *could* be a prob. Just get the power plug out of there once and try it with the power plug hanging in the air.
What I mean by grounding the frontplate seperately is just that you put an additional grounding cable to the frontplate.
Before you do that you could also measure the resistance and the voltage between the frontplate and the ground of your core (if its a resitance below ~0,5 Ohm and voltage about 0V its all OK already).
If its not a ground problem I’ll be damn, so I noticed that my power plug on the metal case, is made of metal also, could it be bad for grounding respect because one end of the power plug is in contact with the case ?
defred
Yepp, thats some point…
you go through those diodes (the bridge recitifer) and so loose 0,7V. That *could* be a prob. Just get the power plug out of there once and try it with the power plug hanging in the air.
What I mean by grounding the frontplate seperately is just that you put an additional grounding cable to the frontplate.
Before you do that you could also measure the resistance and the voltage between the frontplate and the ground of your core (if its a resitance below ~0,5 Ohm and voltage about 0V its all OK already).
