DINX4 - DOUTX4 strange problem...

MIDIbox FM
1

Hello,

I have a strange problem with my DINX4 module…

I have checked DINX4/DOUTX4 modules twice with multimeter, not any shortcut, but my control panel doesn’t really works.

First thing, the synthesizer part seams work well (Just the output 3 and 4 with no sound, but it is another problem…).

I checked and re-checked the control panel four times…

I tried to invert some 74HC165, but with no differences.

The first 74HC165 works, the others not, and two buttons seams be inverted…

I suppose that DINX4 problems cause DOUTX4 problems too?

In attachement you have a view of the dinx4 chematics with notes…

I have tested the CORE J8/J9 pins with the srio_interconnection_test_v1b program and I have discovered that the pin J9/S1 doesn’t change of state, the voltage is always 5.0 V.

In attachement you have a view of the CORE J8/J9 pins checked with my logic analyzer…

As you can see, the J9/S1 pin stay high all the long…

I am not an expert, but I think the problem comes from the CORE module…

I checked the CORE module, but I found not any shortcut.

Can you help me? Any idea?

Thank you

DINX4error.PNG
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logic.PNG
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DINX4error.PNG
DINX4error.PNG1234×782 53.6 KB

logic.PNG
logic.PNG1582×448 145 KB

2

Ok, first to do is remove all registers and check the vd vss sc and s1 rc lines on the sockets

then check all against vss for shorts

your problem sound thta you have an short o an cold soldering pin somewhere on your board

at least check the lines from the core to your board

the same for the core board… ckeck all pins to a proper vd and vss then check the connections to all pins of the connectors.

i now troubleshooting is boring, but necessary :slight_smile:

some strange behaivior on my MB Seq cames from cold soldering pins on the DINX4 boards

an at last… check again when you think you are done :slight_smile:

i hope thats is helpful

Marco

3

Thank you Marco, I will do that.

4

Quick hint: Solve one problem at a time. You’ll find it’s far more effective :wink:

5

Hello,

I have resolved my DINX4 problem by building another DINX4 module, which works fine.

Now, I have another problem. Two of my audio OUT doesn’t work and the sound is very low on the two others…

The strange thing is that during old tests, these two audio out worked fine and now the sound is very low.

Can you help me? Any idea?

Thank you

Faton

6

OK, problem resolved, due to soud card problem…

Synthesizer finished, and working fine!

I will post photo soon.  :wink: