EMU EMAX weird display issue !

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majras
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EMU EMAX weird display issue !

Post by majras » Fri Dec 17, 2021 10:58 am

Hi,
I'm fresh users of Emax which I bought recently.
Apparently my start with this great sampler is not so great because of the display issue :(

I do not know what to do now.

Here is short vid showing this issue:
Last edited by majras on Fri Jan 28, 2022 11:38 am, edited 1 time in total.

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Weirdofromouterspace
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Re: EMU EMAX weird display issue !

Post by Weirdofromouterspace » Fri Dec 17, 2021 12:22 pm

My first guess (!) would be an old old coin cell somewhere on the PCB. Such display and memory errors are just too typical and familiar 8-) .

I had similar experiences, albeit not with an EMAX but with Yahama DX synths.

If that turns out to be the cause, replace the battery (install a battery holder if there is none yet*). Also, you may have to load your patches anew afterwards - I hope you have them stored somewhere.

HTH
* If you don't know how, let a qualified technician do it.
Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you get no sound out of it. - ARP 2600 manual, 1971

majras
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Re: EMU EMAX weird display issue !

Post by majras » Fri Dec 17, 2021 5:04 pm

Thank you for your feedback.
Anyone knows where the battery is placed inside the emax?
I can not find it..

Is it possible that emax does not have any battery on the board?
I was searching internet + service manual and I could not find any information regarding battery


Edit:
I found on the board some modyfications:


Does anyone is familiar with this?

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Re: EMU EMAX weird display issue !

Post by Weirdofromouterspace » Sat Dec 18, 2021 1:45 pm

I'm not entirely sure, but this might indeed be a coin cell holder
emax.jpg
Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you get no sound out of it. - ARP 2600 manual, 1971

majras
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Re: EMU EMAX weird display issue !

Post by majras » Sat Dec 18, 2021 3:26 pm

It's more like potentiometer kind of ajustment for something


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Re: EMU EMAX weird display issue !

Post by Olaf_Oldschool » Mon Dec 20, 2021 4:58 pm

Hi,

take a look at you 2nd vid.
The small black box with the cable tie on the top right corner left to the small attached pcb could also be a battery but not a coin cell.
Just a guess because I can't read whats written on the box.

Cheers

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Re: EMU EMAX weird display issue !

Post by majras » Mon Dec 20, 2021 7:37 pm

You mean this one?

Image

It's inverter!

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Re: EMU EMAX weird display issue !

Post by Weirdofromouterspace » Tue Dec 21, 2021 8:26 am

majras wrote:
Sat Dec 18, 2021 3:26 pm
It's more like potentiometer kind of ajustment for something
Yes, after having seen your second video I agree. The printed "5 KB", which in potentiometers usually translates to '5 kOhm linear', is now clearly legible.
Don't forget to TURN ON THE SYNTHESIZER. Often this is the reason why you get no sound out of it. - ARP 2600 manual, 1971

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Re: EMU EMAX weird display issue !

Post by Olaf_Oldschool » Tue Dec 21, 2021 9:09 am

majras wrote:
Mon Dec 20, 2021 7:37 pm
You mean this one?

Image

It's inverter!
ok, as mentioned before I couldn't really read the writing on it.
It looked liked a capped soldered battery to me.

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Re: EMU EMAX weird display issue !

Post by Rasputin » Tue Dec 21, 2021 4:48 pm

One of the display pins is stuck either high or low. I could probably figure out exactly which one, if I thought about it enough. But suffice it to say that you should double-check the long display pins and the pins they slide into on the front panel PCB. Also verify that the soldering on the display itself is clean and tidy--none of the pins should be touching each other. Only 14 of the pins are used on an OLED like that, so don't be concerned if two appear to be "missing."

edit: More specifically, my guess is D6 signal is either stuck high or shorted to D5. Among many other issues, the 'space' character appears to be turning into a backtick.

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Re: EMU EMAX weird display issue !

Post by majras » Wed Jan 19, 2022 10:01 pm

I'm almost sure that this connection tape is damaged (when I move the tape the messages change...) so probably this is the problem
Any chance to get a spare parts to replace this tape? Is it difficult to replace it?



Image

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Re: EMU EMAX weird display issue !

Post by mateomorikone » Fri Jan 21, 2022 6:02 pm

It should be easy to replace if you know how to desolder the parts safely. This is an IDC 40pin ribbon. You can find both the ribbon and sockets in places like Mouser.

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Re: EMU EMAX weird display issue !

Post by majras » Thu Jan 27, 2022 8:12 pm

Yes the ribbon tape was the issue!
I have replaced the tape and problem gone. Display works !

But I have another problem :(
There is no sound when I hit a key only white noise no matter which output only white noise.

Please someone advice how to diagnose a fault


EDIT: I mark this topic as solved

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