Muses Volume

[meldano]

Hi Chris,

do you use the pre programmed controller? I can´t find a marker on the top.
Troubleshooting is always the same:
-3,3V power supply to the microcontoller
- connect status LED
- voltage on
- push the encoder button


If the LED toggle => everything with the controller is o.k.

 

[Chris In Milwaukee]

Yes sir. The marks came off while cleaning the boards. The voltages all appear to be good at the micro and elsewhere. No status LED light up, however. I presume the pull-up resistor additions were installed correctly and hopefully aren’t an issue. Both boards are acting the same, so perhaps they share a common problem.

Should I pick up a programmer and see if we can reach and possibly reprogram the microcontroller?

Hi Chris,

do you use the pre programmed controller? I can´t find a marker on the top.
Troubleshooting is always the same:
-3,3V power supply to the microcontoller
- connect status LED
- voltage on
- push the encoder button


If the LED toggle => everything with the controller is o.k.

 

[meldano]

Why reprogramming? The flash is not volatile.
Can you measure 3,3V at Vss / Vdd controller pins ?

 

[Chris In Milwaukee]

Will do and report back ASAP.

 

[Chris In Milwaukee]

Just throwing out options and reprogramming was one. Probably a dumb one.

I did have 3.3V on Vdd. Vss is shown as ground on the schematics, and I was reading zero there. I just lost my +15VDC regulator, so it looks like I've got a little more work to do now. 🙁

I'll wait until my new 15V transformer comes in before I do anything else. And get some new regulators on order.

 

[dBel84]

any chance this would work with +- 12V ?? if so I have some regulators for you

EDIT - based on data sheet for 7230 chip ( is this still the right chip ? = NO 7232 is the new one ) it can function from +-8.5 to +-18V

7232 data sheet indicates +- 10 to +- 18

@meldano - if 12V will work, I can save Chris the wait for shipping

 

[Chris In Milwaukee]

Thanks dB. AFAIK, the +/-15V is for the Muses chip (72323 is current). The CPU runs on +3.3V which I have (had until a few minutes ago). The +/- limits the input swing on the Muses, which may not be a big deal. Might be worth trying if it's compatible. The +12V will feed the +3.3V reg without issue, I suspect. Appreciate your generosity!

I may consider putting those regs on heatsinks, too. But I can't sense any significant heat coming from them. :shrug:

any chance this would work with +- 12V ?? if so I have some regulators for you

EDIT - based on data sheet for 7230 chip ( is this still the right chip ? = NO 7232 is the new one ) it can function from +-8.5 to +-18V

7232 data sheet indicates +- 10 to +- 18

@meldano - if 12V will work, I can save Chris the wait for shipping

 

[meldano]

I double checked every controller before shipping

 

[carsten.witt]

Chris,
please post a big high res pic from all boards (top/bottom), not that you put a solder jumper to wrong place.
meldano's doc is really good but sometimes (as me) I make a little mistake an then the looking goes crazy.

 

[Chris In Milwaukee]

Thanks Carsten. Let’s start with the unbalanced set.

 

[Chris In Milwaukee]

No worries. I have no doubt. 🙂 Just scratching my head on this one and reaching for possibilities.

I double checked every controller before shipping

 

[carsten.witt]

Chris,
I didn't see what can be wrong, so eagle eye meldano should look also to your boards. :-(

 

[Chris In Milwaukee]

Thanks for looking.

Chris,
I didn't see what can be wrong, so eagle eye meldano should look also to your boards. :-(

 

[Chris In Milwaukee]

Good news! After re-reading the adjustment procedures, it turns out I’m just slightly blind and impatient. 😛

The status LED is quite dim with the suggested 2K resistor, so I just hadn’t noticed it blinking at me. I watched closely as I powered up holding down the encoder button, and I also didn’t wait long enough for it to signal me. It works as expected and the remote control and parameter tables program as designed. So the micro is good! What a relief.

I still have a bad -15V regulator, and those are on order (or in transit from dB-Key 😀 - thanks dB!)

I’ll see what other features I can test with positive voltage only.

Oh, although it worked without it, I also provided a proper ground from my secondary main board on the balanced set since there were plenty of holes available from which to choose. We’ll see if it’s a noise generator and if I’ll need to move it closer to the power source entry point.

 

[Chris In Milwaukee]

I presume the Muses controls the relay driver on the main board which is why it's not doing anything since I'm down a power supply rail at the moment. All outputs read +5V, so I presume that chip provides an active low to drive relays and LEDs.

 

[meldano]

I am relieved 😉

Relays:
Did you set the parameter
4, Max Input >0 and restart?
Yes, the driver provides an active low to drive the relays.
Have a look to the schematic.

Controller Board J2:
Set the jumper to 2:3 because 3,3V supply from mainboard is connected.

LED:
I will remove the value. It was only an example.

 

[carsten.witt]

TOP! 🙂

 

[Chris In Milwaukee]

We share similar relief!

I did not set that parameter. I left everything defaulted first go around. I’ll double check that setting.

Your schematics are great. Thanks for the detail! I’ll update the jumper position and report back when I get the regs installed.

After a second thought about the ground I installed for testing, it will likely be grounded through the audio ground of the stage it connects to. Probably going to introduce a ground loop like this. I'll take it off when installing it in its home gear.

Appreciate your support!

Edit: After inspecting pictures, the jumper on the micro board should be in the correct position. The board is upside down in the photo. 🙂 I’ll still double check, though.

I am relieved 😉

Relays:
Did you set the parameter
4, Max Input >0 and restart?
Yes, the driver provides an active low to drive the relays.
Have a look to the schematic.

Controller Board J2:
Set the jumper to 2:3 because 3,3V supply from mainboard is connected.

LED:
I will remove the value. It was only an example.

 

[Mayday]

I see the controller board and programmed u-controller, but where can I find the mainboard?
I haven't read the entire thread, so I may have missed that info.

 

[Chris In Milwaukee]

Are you looking for a photo of it or something different? There are some front/back photos in post #550. It contains a PSU and input switching.

I see the controller board and programmed u-controller, but where can I find the mainboard?
I haven't read the entire thread, so I may have missed that info.