Awesome. I am glad to hear that your problem is solved. Would you please update us on what was the problem and how did you solved it so that someone else with similar problem could learn.
Thank you
Vladimir
Thank you
Vladimir
Of course.
The problem was 1 broken muting transistor, for the channel that had lover output level.
The problem is solved simply with removing the transistor from the board. Nothing on the board is changed, so, finding a new transistors and soldering them to the board is possible.
There are some reports that removing muting transistors may positively impact the sound, so I removed all 4 output transistors (this is also considered as a mod for the card).
The other side of removing these transistors is slight "pop" on powering ON and OFF the PC, if the amplifier is turned ON.
The muting transistors are the transistors on the last photo I posted.
Thank you.
The problem was 1 broken muting transistor, for the channel that had lover output level.
The problem is solved simply with removing the transistor from the board. Nothing on the board is changed, so, finding a new transistors and soldering them to the board is possible.
There are some reports that removing muting transistors may positively impact the sound, so I removed all 4 output transistors (this is also considered as a mod for the card).
The other side of removing these transistors is slight "pop" on powering ON and OFF the PC, if the amplifier is turned ON.
The muting transistors are the transistors on the last photo I posted.
Thank you.
I have the same problem. One channel is doing nothing.
Which type transistor can I use to replace?
Please let me know
Muzieknoot
Which type transistor can I use to replace?
Please let me know
Muzieknoot
Hi jugoslavija and everyone else who helped in this thread.
I am a long time member of diyaudio and seldom post but i just want to thank you guys, this is such an easy fix... one channel stopped working on my 1212m and i tried your fix and it worked!
So happy 🙂
I am a long time member of diyaudio and seldom post but i just want to thank you guys, this is such an easy fix... one channel stopped working on my 1212m and i tried your fix and it worked!
So happy 🙂
Hi all.
Don't know if it would be better to create another thread but, since it's a problem related to the EM8810 card, i'll report here.
I have the 1212m combo with the notorious muting transistors problem on the EM8820 card. Fixed it with your precious help by replacing two MMBF4392 transistors as i didn't want any pops...
And now i got from a friend another 8810 card, PC12440 rev B card, same thing. He busted the dock power connection and tried to fix it himself. Very messy job. I think this is 3 layer pcb maybe?... Now, with everything cleaned and without a new connector on the board, I get 4.5V DC on the 12v input (?). And without connecting the 12v power from the ATX psu.
The earlier messy job did it of course. Any hints on how can i fix this?
regards,
Adriano
Don't know if it would be better to create another thread but, since it's a problem related to the EM8810 card, i'll report here.
I have the 1212m combo with the notorious muting transistors problem on the EM8820 card. Fixed it with your precious help by replacing two MMBF4392 transistors as i didn't want any pops...
And now i got from a friend another 8810 card, PC12440 rev B card, same thing. He busted the dock power connection and tried to fix it himself. Very messy job. I think this is 3 layer pcb maybe?... Now, with everything cleaned and without a new connector on the board, I get 4.5V DC on the 12v input (?). And without connecting the 12v power from the ATX psu.
The earlier messy job did it of course. Any hints on how can i fix this?
regards,
Adriano
There is a detailed discussion about fixing EMU dac boards at: Choosing of best sounding OP AMPs for the lowest possible THD+N -really the best Way? ....starting maybe around post #283, or possibly even a few pages earlier, say, around post #262
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