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γ3 in a coma

gamma3, gamma24 (plug-in for the γ3)

Re: γ3 in a coma

Postby Balcmeg » January 20th, 2017, 11:30 pm

Balcmeg wrote:
amb wrote:OK, those numbers all look reasonable. Somehow there is a voltage drop from γ3 J14 to the ζ1's VDD_5V0 board connector by around 0.25V-0.3V. The only thing that might drop voltage is the load switch IC (γ3 U20), but I don't expect the drop to be quite this much. At any rate, these are regulated down to 3.3V on the ζ1 board so it is not a problem.

Do you have access to a Linux computer? When you connect the USB cable to the ζ1, it should be quite obvious what (if anything) happens by watching the syslog (usually /var/log/messages).

No Linux computer around at the moment. But maybe I can get the same info from Macos, since it's Linux based.
Will take some time to research this.
Sent from my iPhone using Tapatalk


Skippee the research, I remembered that I had a bootable USB with Mint Linux. Booted fine of the laptop.

syslog for z1:1
nothing happens at all in syslog

syslog for z1:2
Code: Select all
Jan 21 07:19:50 mint kernel: [  545.468133] usb 7-1: new low-speed USB device number 2 using uhci_hcd
Jan 21 07:19:50 mint kernel: [  545.592128] usb 7-1: device descriptor read/64, error -71
Jan 21 07:19:50 mint kernel: [  545.820136] usb 7-1: device descriptor read/64, error -71
Jan 21 07:19:50 mint kernel: [  546.036135] usb 7-1: new low-speed USB device number 3 using uhci_hcd
Jan 21 07:19:51 mint kernel: [  546.160122] usb 7-1: device descriptor read/64, error -71
Jan 21 07:19:51 mint kernel: [  546.384132] usb 7-1: device descriptor read/64, error -71
Jan 21 07:19:51 mint kernel: [  546.600132] usb 7-1: new low-speed USB device number 4 using uhci_hcd
Jan 21 07:19:51 mint kernel: [  547.016085] usb 7-1: device not accepting address 4, error -71
Jan 21 07:19:52 mint kernel: [  547.128129] usb 7-1: new low-speed USB device number 5 using uhci_hcd
Jan 21 07:19:52 mint kernel: [  547.544102] usb 7-1: device not accepting address 5, error -71
Jan 21 07:19:52 mint kernel: [  547.544162] hub 7-0:1.0: unable to enumerate USB device on port 1
/Stefan
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Re: γ3 in a coma

Postby amb » January 20th, 2017, 11:38 pm

Your first ζ1 is obviously toast.

Unable to enumerate for the second ζ1. Hmm.
Are you using a good quality, short-ish USB cable? If so, then it would appear that it might be damaged too.

Has either one been subjected to mechanical stress that may break a PCB trace or SMD solder joints? Pay special attention to the USB connector. Also is there a problem with high ESD (eletrostatic discharge) at your location that may zap the USB input circuitry in the AT32UC3A3256 MCU?
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Re: γ3 in a coma

Postby Balcmeg » January 20th, 2017, 11:57 pm

amb wrote:Your first ζ1 is obviously toast.

Unable to enumerate for the second ζ1. Hmm.
Are you using a good quality, short-ish USB cable? If so, then it would appear that it might be damaged too.

Has either one been subjected to mechanical stress that may break a PCB trace or SMD solder joints? Pay special attention to the USB connector. Also is there a problem with high ESD (eletrostatic discharge) at your location that may zap the USB input circuitry in the AT32UC3A3256 MCU?


z1:1 goes to the trash then.

cable is audioquest something USB cable, it is working perfect with my iMac and gamma2/M3 combo.
as for mechanical stress, plugging the boards in and out is quite stressful - on both the boards and myself.. z1:1 did get blistering hot at one time so i am not surprised if its done for.

As for ESD I cant say. At the moment its quite humid here,,aroud 95%, but when i used it last it might have been considerable dryer. Cannot rule out that possibility. At that time I was also having trouble with the LCDuino so it might have been something that affected z1 at the same time and led me to plug it in and out unecessarily.

Seems we might close this now, since all else is workig fine he only way of knowing what is going on is to get a new z1, plug it in and see whats happening from the beginning.

I just hate to have to plave an digikey order for the pin headers again.... wish i could remove the pins and reuse, but i doubt that be possible.. unless i cut off pieces of the z1 board..
/Stefan
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Re: γ3 in a coma

Postby Balcmeg » February 6th, 2017, 9:23 pm

Ok

So my new ζ1 arrived by mail today! Already soldered the headers and installed it. Mu CuBox/OpenElec recognise it and I can select it as a audio output. So far all is well.

Problem is that i dont get any signal again, my Gamma3 display does not show lock on any sampleRate, even if i try different output rates from my CuBox.

Whats worse is that no other input lock on signal either / not even after i removed the ζ1!

Did my SRC fry again? Im not sure if the PCB can handle the stress of another replacement.
/Stefan
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Re: γ3 in a coma

Postby Balcmeg » February 6th, 2017, 10:17 pm

Managed to connect the laptop with Windows again.
Windows also recognise he Widget as a device, and I can see it in the widget control software as

Opening usb device OK
Device: VID=0x16D0/PID=0x098C
Product: AMB zeta1 USB-I2S Audio-Widget
Manufacturer: AMB Laboratories
Serial number: 2015082600AMB

This time it seems the problem is back in the Gamma3. But what made the G3 stop working when I inserted Zeta1 and why is it not working now?
/Stefan
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Re: γ3 in a coma

Postby Balcmeg » February 6th, 2017, 10:22 pm

Voltages on Zeta1,U2 is normal except for Pin 1 and pin 5 where it is 4.75V.

VBUS, pin 29 is 5.14V with USB connected and 0.04 with USB disconnected.

Seems that the Zeta is working properly,but I am concerned as of why The voltage is as low as 4.75...
/Stefan
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Re: γ3 in a coma

Postby Balcmeg » February 6th, 2017, 10:37 pm

hehe..
Ok I wasted my own time a bit here.

Started looking for problems in the wrong end. First by checking the zeta1 problems in this post the way we did before.
then I went back and begunmeasuring Gamma24.Until UItook a deep breath and realised the solution to the problem were just at the end of the Section..

I plugged and unplugged the AVDD cable a couple of times and now its working.
If I werent so lazy I would remove the headers and use Phoenix contacts with screw instead. If the problem show up again I will!

CASE CLOSED! (for now)
/Stefan
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Re: γ3 in a coma

Postby Balcmeg » February 6th, 2017, 11:23 pm

Soon the new, larger enclosure for Gamma3 PSU will arrive, I already have the other parts.
Today got the DAC drawings of a potential Beta24 stereo enclosure too so i will see if this one will work. Inner dimensions are HxWxD 200x380x377 mm, might be too deep for easy placement but easier to fit in everything.
One step closer to completion, although the Beta enclosure will need some thinking before I dare to order.
/Stefan
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Re: γ3 in a coma

Postby amb » February 6th, 2017, 11:33 pm

Balcmeg wrote:hehe..
...
CASE CLOSED! (for now)

I'm glad you found the (simple) problem before we embark on another wild goose chase!
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Re: γ3 in a coma

Postby Balcmeg » February 6th, 2017, 11:45 pm

amb wrote:
Balcmeg wrote:hehe..
...
CASE CLOSED! (for now)

I'm glad you found the (simple) problem before we embark on another wild goose chase!

Me too, but I had an excellent diagnostic tool in this thread thanks to your previous support.

Lets hope I wont need any more - until its time for Beta24....
/Stefan
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