PROBLEM MIDIBOX FM

[matoz]

Hello all, i have problem with MBFM.

All is good but the sound is very very weak.

The tl074 are new and i have +12 and -12 on pin 4 and 11 of tl074's.

Why the sound is very small?  ???

[matoz]

Can it be a PSU problem?

I use two 12v 1A adptator with OPL3 PSU and one 9V 1A adaptator directly on core module. Regulators are not hot, i checked all, it seems to be good, i have +12v , GND , -12V for OPL3.

It is the third time i built Core-OPL3 and at this time I have new YMF262 and YAC512, i have sound, but very very little!   ???

[stryd_one]

Heya matoz, we talked about this is the chatroom, did you get it working?

[matoz]

I tryed another PSU and i have the same results. At one moment i have a very big noise 5 to 20 sec and it disapear and time to time, i can hear Testtone very well 5 to 20 sec and it disapear too  :-\ and after, i have the very big noise. I think i have a problem with a Capacitor but whitch?  ???  I will change 100pF ones because i can' t read the value, perhaps the dealer have done a mistake. So, the other values seems to be good.

[/tilted/]

Can it be a PSU problem?

i have +12v , GND , -12V for OPL3.

Tell me you also have +5v on the OPL3 board...

[matoz]

Of course, i have 5v on J1

[RoyalScam]

I hate to ask this, and I really don't mean to offend, but is the synth plugged into an amplifier, or have you just connected speakers to the outputs?

RoyalScam

[matoz]

Yes, no problem.

I would be happy if it would be only that!

I replaced 100pF caps and there is no more big noise.

I can hear testtone or Rhodes piano, very slightly, only on output 1 and 3. On output 2 and 4, i have nothing.

[TK.]

Hi Matoz,

can hear testtone or Rhodes piano, very slightly, only on output 1 and 3. On output 2 and 4, i have nothing.

thats a good sign. It means, that the core can control the OPL3 module, that the YMF262 is running, and that the connections between YMF262 and YAC512 are (probably) ok.

Do you hear the sounds on the OP amp inputs I1+/I2+/I3+/I4+ of IC6 (the output buffer)?

If not, visually check (extensively) the connections between the two YAC512 and IC3/IC5 - due to the small pin size of the SMD parts, a open (not soldered) or shortened junction is very likely.

Best Regards, Thorsten.

[matoz]

Thanks for your answer, Thorsten, It gives me hope again!  ;)

I will test that this evening.  Opl3 is not dead!  >:(

Best regards

[matoz]

YEEEEEEEEESSSSSSS, It works! ;D ;D ;D

I have changed 2.7nF caps and i have resolder some parts.

And now, it works very well!!!!  Thank you all!

But i had a problem last night with Bankstick.

Does MBFM support 512k bankstick?

[TK.]

Fine! :)

I guess you mean a 24LC512 - yes, it's supported, but it doesn't make a difference if you connect a 24LC256 or 24LC512, only 32k will be used.

Best Regards, Thorsten.

[matoz]

When i tryed to load patchs with TL's Patch manager 0.7, it is written " bank A not available" . Why?

Bankstick was formated, i don' t understand.  ???

[TK.]

Since you've posted this question also in the french forum, I'm not sure if the issue is already solved.

I don't know, why TL's patch manager shouldn't be able to access Bank A... maybe some pins of the EEPROM are not connected?

Best Regards, Thorsten.

[matoz]

Yes, it works very well  ;D

It was a problem with bankstick connections.

Thanks all!!  ;)

[stryd_one]

That's great news matoz... Maybe you could take a few minutes to document the answer here (in English) so that others who might have this problem in future can find the answer with a search ;)

[matoz]

TL' s patch manager refused to send MBFM patchs besause EEprom were bad soldered and bad formated.

I have formated with SEQv3, (MBsid could not format EEprom formated with MBFM, it made a loop!??) and i could reformate correctly with MBFM.  ;)

[stryd_one]

Thanks mate :)

MBsid could not format EEprom formated with MBFM, it made a loop!??

That's strange... [me=stryd_one]looks at TK[/me]

:D

[TK.]

Yes, thats an error in MBSID V1, which won't be fixed anymore (as this is an untypical corner case)

Best Regards, Thorsten.