Yocto build - Click sound and no instrument sounds

Hi there,

When I finished the yocto I wanted to test it of course if I did right. Well I did wrong i guess....
Sequencer is not the problem, it runs, it can edit etc etc. but there is no sound... Not on the individual instruments and not on the master. But I hear a faint click in the back. Not on all instruments. Just on the CY.

When I Program accents the click is getting louder and it turns down when I use the accent pot meter.
My knowledge is limited to resolving errors and I do not have a scope, so any help would be appreciated....
I can get a scope from work. Maybe some one can explain to probe a signal so I can learn from it

Thanks,

M.

EDIT, ok my first logic is that it is not in the sequencer part. So my question is this, how can I trigger a BD without the seq. So I can exclude the instruments part and maybe it is the amp 4011 part I already saw on this forum.

Checked the the polarity of all caps and there good.

Did you check the +/-15V supply on all ICs during the build (as stated in the build instructions)?

Yep, they where ok but I solder 2 IC's with power plugged in. And if I can recall this it was also the 4011.
Maybe that I have to replace? Can I still check those voltages with IC soldered?

Thanks,

Maarten

Checking the voltages with ICs soldered is fine.

Checked the voltage on ALL the Dual Operational Amplifier 4558 IC's

+rail = +12,7 V
-rail = -0,7 V That is wrong I guess

And now

Maarten wrote:Checked the voltage on ALL the Dual Operational Amplifier 4558 IC's

+rail = +12,7 V
-rail = -0,7 V That is wrong I guess

And now

Have you checked if the negative value is right directly from the PSU board?

As already suggested, I would first disconnect the PSU Board from the main board and measure the
+/-15V supply voltages directly on the PSU board.

Yes Fabi, I measured the voltage on the PSU board it gives +12 and -0.6ish Already replaced the negative voltage 7915CT. Did not make any difference.

Where is the schematic for the PSU? The one before the regulators? Could not find it in eagle. There is no fuse involved, am I correct?

I'm still waiting for my Yocto Kit, so cannot tell for sure, but from looking at the PCB pictures the PSU looks straight forward,
the LM2596 is for the +5V supply, which is working. In front of the 7815 / 7915 is just a bunch of rectifier diodes and thats all.
You also have no input voltage in between the left and middle pin of the 7905 (Ground and Voltage input?)
Are you definitely sure, your wall socket powersupply outputs 15V AC? DC supply will not work of course.