e-licktronic Forum

I bought a Nava 909 with V1 boards running V1.028beta with issues - for parts or repair. The issues turned out to be mostly cold solder joints in the audio sections - the Kick was missing, etc.

The issues remaining are:

- In the Snare drum section, at IC34 an M5218 was bent backward and snapped off in its’ SIL header. So I haven’t got the snare back yet.

Edit: I had spare M5218's. Dropped one in and the snare sounded ringy, muffled, and thin... Found that the clap was also affected so I checked the noise section. The 4070 IC was jammed into place so that a leg had bent and skipped the socket. Reseating it has all the sounds working as they should.

- And the encoder won’t actuate/click.



It was skippy and wouldn’t hold its values. I looked at the encoder itself and the original builder had done serious damage to the PCB in that area. Brutalized and burned nearly every pad it was supposed to solder to.

I got another Bourns PEC16 - 16 mm Incremental Encoder (PEC16-4215F-S0024) and, using the schematics, connected the pins to their respective components, point to point w fine wire, bypassing the burnt traces and pads on the pcb.

The encoder value issue was fixed… but Nava doesn’t read the clicks when the encoder is depressed.

It is supposed to use a Contact Push ON Momentary SPST switch type but I just can’t get any of my encoders actuation to register.

-The travel on the shaft feels fine and it clicks audibly.

-5v appears between Pins E/D on actuation and the quadrature output looks normal.

- Aside from the burned traces everything looks as it should and goes where it should according to the schematic.

Is this a software issue? Issue with the Atmega1284p?

I have no 5V at TP1, even trimming TM2, in normal mode. But I do have it when I’m in TP2 cal mode.

Everything else I have checked, sequencer and the other sounds, work as they should. Maybe the Toms sound a bit distorted? I’m not sure.

Any help is appreciated. Thanks!

I'm not seeing 5v on the ATMega at ENC_SW when pressed. The pin stays low when the push button is depressed, so there is no state change detection. But 5v is working on the switch itself. Looks like a via would've connected it to one of the encoder pins, but the pad had been completely burned, so this is likely the issue... going to see if I can route the pin there another way.

That was it. My repair work is pretty ugly because I had go to directly from the encoder pin to the atmega pin with wire, the via was just too fragile. But it worked... Onto some deeper testing for this one.