hi all
for 1 yac i need to solder other components ?
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tested the module and no sound
tested with mbfm_interconnection_test_v2 the connection its ok
tested with mbfm_testtone_v1c no sound in out 1 or 2
i got a popping noise sound when turn on the mbfm
?
best regards
That’s all the parts you need (if the components on the bottom side of the board are soldered correctly and there’s a jumper wire under IC3).
* Got a pic of the underside?
* Are the voltages ok (especially the bipolar supply voltage for the OPAMPs)?
* Got a pic of the underside?
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* Are the voltages ok (especially the bipolar supply voltage for the OPAMPs)?
yep +15v and -15v 2x1.6amp 50va (my tr808 clone psu)
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thx for your help
best regards
erm…dont get me wrong but that soldering looks really aweful and you got several bridges at the smd chips and all over the place.That´s very likely the reason that it is not working. I see bridges at pin 8/9 and 13/14 of the OPL. The Chips look like they would “stand” on solder.
Then you got a bridge in front of the nr. 1 pin of the OPL between the third and fourth trace…and so on..
What iron did u use? Small tip and regulated is highly recommended especially when dealing with SMD parts. Its not only that
you get bad and bulky joints but you “burn” the chips using an unregulated iron with a big tip.
What you can do now is “cleaning” the PCB. That means that you get yourself some solder wick and desolder the SMD parts (with a decent iron!) and resolder the obvious bridges. Do that carefully. Dont heat the SMD parts for too long and with to much power. They will fry if they havent already.
I could imagine you already broke the parts but just try it.
Watch this to get an impression how to solder SMD.
http://store.curiousinventor.com/guides/Surface_Mount_Soldering/101/
Oof.
* Check continuity between all adjacent pins everywhere…
i re tested the continuity and no bridge in smd chip …
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erm…dont get me wrong but that soldering looks really aweful and you got several bridges at the smd chips and all over the place.That´s very likely the reason that it is not working. I see bridges at pin 8/9 and 13/14 of the OPL. The Chips look like they would “stand” on solder.
Then you got a bridge in front of the nr. 1 pin of the OPL between the third and fourth trace…and so on..
What iron did u use? Small tip and regulated is highly recommended especially when dealing with SMD parts. Its not only that
you get bad and bulky joints but you “burn” the chips using an unregulated iron with a big tip.
What you can do now is “cleaning” the PCB. That means that you get yourself some solder wick and desolder the SMD parts (with a decent iron!) and resolder the obvious bridges. Do that carefully. Dont heat the SMD parts for too long and with to much power. They will fry if they havent already.
I could imagine you already broke the parts but just try it.
Watch this to get an impression how to solder SMD.
http://store.curiousinventor.com/guides/Surface_Mount_Soldering/101/
i use an ersa 3cs/331 30w and 1.5mm tips
the chip are not burned i desolded it very carefully it does not have to heat only tepid
check my new pic with light back the board
thx for your help
Aren’t you missing some components south of IC6? Best solution would be to just solder the missing parts, i think - all done 
that way you will also be ready for an extra YAC if you find one at some point. It’s not like it will be very expensive or anything 
Aren’t you missing some components south of IC6?
The missing components (C14, C19, C13, R13, R10, R12, R15, C25, C26, C29, R11, R14, C33, R20, R21, R22, R23, C34, R3, C11, C22, C21, C12, C30) are only relevant for the second YAC (see http://ucapps.de/mbhp_opl3.html). Leaving them out will not cause any problems.
Make sure to check for bridges further away from the SMD chips as well - better to be on the safe side 
If you’re positive that you don’t have any bridges, remove the opamps and see if you get an audio signal @ IC3:10 and IC3:14. That’ll help to tell us if the problem occurs before or after the opamps.
http://discourse.midibox.org/t/topic/14656
I had problems with the YAC. I am still not sure if it was the chips I got or my Surface mount soldering. Those little bastards are finicky. I was super meticulous with the second set I got and Lo and Behold! I Haz FM!
I do know that I had problems with my GM5 and upon closer inspection it looked like it probably could have done with a more thorough soldering job. Unfortunately, when I went to pull him off, a couple of his legs went bye bye. :bye: Poor little guy never had a chance.
Luckily the YACs seem a lot sturdier.
Check pins 21 and 22 on the YMF with a headphones and a resistor or something like that to see if your getting audio out of it.
Check pins 21 and 22 on the YMF with a headphones and a resistor or something like that to see if your getting audio out of it.
i get this waveform on opl pin 21 and 22
which value for the resistor on headphone ?
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remove the opamps and see if you get an audio signal @ IC3:10 and IC3:14. That’ll help to tell us if the problem occurs before or after the opamps.
get this from ic3 pin 10
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and this on ic3 pin 14
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thx
all module
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The cable link between the core and opl3 is a bit long…cut it by half or third.
i retested the interconnetion test i have not tested if the other pin is to 0v
is the problem !
check this tab with the votages
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Check pins 21 and 22 on the YMF with a headphones and a resistor or something like that to see if your getting audio out of it.
Those are digital pins - why would you “listen” to what comes out of them? There’s no audio before the YACs.
By default all unselected pins are 0V
Hmm.
Remove the LCD for testing (as it shares pins with the OPL3)
Check for shorts on the core>opl3 connection
Recheck the wiring (http://ucapps.de/mbhp/mbhp_opl3_interconnections.pdf)
Shorten the cable between core and opl module
Those are digital pins - why would you “listen” to what comes out of them? There’s no audio before the YACs.
Hmm.
Remove the LCD for testing (as it shares pins with the OPL3)
Check for shorts on the core>opl3 connection
Recheck the wiring (http://ucapps.de/mbhp/mbhp_opl3_interconnections.pdf)
Shorten the cable between core and opl module
tested the same
checked no shorts and tested with other core module the same !!!
checked and rechecked no error
not tested thats possible is only the cable in fault ?
other test
try other pic the first is a 18f457 try on 18f4685 the same
tested with no eeprom on core board the same
tested only the core the same error on d0 d1 d2 d3
thx
use the correct processor/MIOS combination.
Also, remove the PIC for a test and see if the D0-D3 lines stay high.
use the correct processor/MIOS combination.
Also, remove the PIC for a test and see if the D0-D3 lines stay high.
re tested without the pic and 0v on D0-D3
use the correct processor/MIOS combination.
What’s the best combination ?
