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Rene Schmit
Joined: 26 Nov 2007
Posts: 2
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 Posted: Mon Nov 26, 2007 7:00 pm Post subject: Problem with sound |
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Hello,
I have a problem with the sound: It works, but only on the left channel, the right one stays mute.
I have tried several headphones, always the same result (the headphones work with other equipment, so this is not the problem...).
I have tested sound with the preinstalled Gentoo system, and with a Debian kernel (card: CS5535 Audio, Chip: Wolfson WM9711,WM9712 ), to no avail. I get lots of settings (KDE and/or alsamixer), tried to change each one (yes, also the balance  ) but stlil only sound on one channel.
Are there any special driver settings that I am missing? Or could this be a hardware-related issue?
Thanks for your help,
René |
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Rik
Joined: 27 Nov 2007
Posts: 3
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| Posted: Tue Nov 27, 2007 11:25 am Post subject: |
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Hi Rene,
I had the same problem. When I opened the case I noticed that one contact of the bus did not touch the jack of my head phone. After applying a little force  I got a stereo signal.
Btw, the same holds for the line in of my Fit-PC....
I hope this helps!
Regards,
Rik |
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Rene Schmit
Joined: 26 Nov 2007
Posts: 2
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| Posted: Tue Nov 27, 2007 8:13 pm Post subject: |
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Rik,
thanks for the answer, I pushed the jack in very hard but it did not help 
What do you mean by applying a little force? On the contact of the connector, when you opened the case? Sorry, but I don't want to open the PC and void my warranty.
Anyhow, thanks a lot for your help
René |
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Rik
Joined: 27 Nov 2007
Posts: 3
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| Posted: Wed Nov 28, 2007 7:36 am Post subject: |
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Hi Rene,
By applying force I meant bending the contact inside the bus that is mounted inside the FIT-PC. The contact has to be bended towards the middle of the bus. For doing that you have to open the case!
If you ask me, this looks like a (too) cheap bus that is mounted there. I also understand that you won't open the case; In that situation I would ask for an RMA so that they can bend the contacts in Israel....
I'll check my FIT-PC number as soon as I'm back home to night, so you can cross check if they are assembled at nearly the same time with possibly the same parts.
Best regards,
Rik |
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Rik
Joined: 27 Nov 2007
Posts: 3
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| Posted: Fri Nov 30, 2007 6:20 pm Post subject: |
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hi,
as mentioned in previous post: my fit-pc nr is 070821-141.
Regards,
Rik |
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ekarak
Joined: 02 Dec 2007
Posts: 4
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| Posted: Tue Dec 04, 2007 6:42 pm Post subject: |
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I am having the same problem too, my fitPC serial# is: 071104-018. Just opened it and found out it is actually a 3.5 mm SPDT plug which connects the right signal to the left when there is no jack inserted. When I insert a 3.5mm stereo jack the right signal simply goes unconnected. Therefore I suppose it's the wrong part type for the job.
In Wikipedia it is described as a type D adapter:
http://en.wikipedia.org/wiki/Audio_jack#Configurations_and_schematic_symbols
the audio in plug has the same problem. |
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ekarak
Joined: 02 Dec 2007
Posts: 4
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| Posted: Thu Dec 13, 2007 9:17 pm Post subject: still no stereo output |
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Today I soldered a new audio plug to the cable following the layout in sb-iGLX PCB layout. It now works (sort-of), and both speakers get sound but still no stereo (using mplayer with a proven stereo MP3 file).
The strange thing is that the KMix application does indeed control stereo left or right balance (therefore the cabling layout is correct) but somehow the audio codec (or the linux audio driver) does stereo-to-mono downmix before the DSP.
elias |
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irads
Site Admin
Joined: 22 Jul 2007
Posts: 674
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| Posted: Fri Dec 14, 2007 1:35 pm Post subject: |
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The Linux audio drivers are not customized at CompuLab.
You may consult the corresponding communities.
_________________
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Irad Stavi
fit-PC forum admin
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ekarak
Joined: 02 Dec 2007
Posts: 4
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| Posted: Sun Dec 16, 2007 3:47 pm Post subject: |
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PROBLEM SOLVED!
searching inside alsamixer, the parameter "Out3 VF" (if I remember correct), toggles stereo to mono downmix so that stereo output is possible.
I fiddled with the other parameters in alsamixer and it can make fitPC sound reasonably good. Now I can put it next to my Hifi amplifier and use it to my heart's content!!! |
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gwarthur
Joined: 22 Dec 2007
Posts: 9
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| Posted: Mon Dec 24, 2007 4:24 pm Post subject: |
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| ekarak wrote: | PROBLEM SOLVED!
searching inside alsamixer, the parameter "Out3 VF" (if I remember correct), toggles stereo to mono downmix so that stereo output is possible.
I fiddled with the other parameters in alsamixer and it can make fitPC sound reasonably good. Now I can put it next to my Hifi amplifier and use it to my heart's content!!! |
I'm confused here; when I looked at the line out jack, it appeared to be a mono, rather than a stereo jack. Compulab, can you clarify? Does the fit-PC output mono or stereo sound? -GA |
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irads
Site Admin
Joined: 22 Jul 2007
Posts: 674
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| Posted: Tue Dec 25, 2007 8:50 am Post subject: |
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fit-PC Line-out is stereo.
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Irad Stavi
fit-PC forum admin
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gwarthur
Joined: 22 Dec 2007
Posts: 9
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| Posted: Tue Dec 25, 2007 6:06 pm Post subject: |
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| irads wrote: | | fit-PC Line-out is stereo. |
Then I'm sorry to say that the wrong type of line-out jack was installed in my unit. My line-out jack is definitely mono, with no contact for the middle (ring) contact on the plug. Instead, my line-out jack has a shorting switch that opens two leads when a plug is inserted and shorts them when the plug is removed. This type of jack might be used as a mono headphone jack in a device with a built-in speaker; inserting a headphone plug would disconnect the built-in speaker.
From what I've read, a fair number of people have sound in only one channel, suggesting the same cause.
In any case, what is the next step?
If the line-out cable and jack are an assembly that plugs onto the mainboard, the safest (but most expensive) remedy would be for Compulab to send out replacements. Alternatively, many of us can probably handle replacing the jack ourselves with the proper one. That process would be considerably easier if you could list a couple of manufacturers and part numbers for the correct jack and the color codes of the left, right and common leads.
Many thanks for your consideration and assistance in correcting this error. -GA |
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irads
Site Admin
Joined: 22 Jul 2007
Posts: 674
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| Posted: Wed Dec 26, 2007 8:03 am Post subject: |
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This is the audio jack used in fit-PC
http://anacapa.kycon.com/Catalog_PDF/STP3501.pdf
As you can see it is a simple stereo audio jack. The two leads in the jack should not short-circuit when the plug is out - if they do in your fit-PC you may send it by RMA.
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Irad Stavi
fit-PC forum admin
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jideel
Joined: 14 Dec 2007
Posts: 11
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| Posted: Sun Dec 30, 2007 1:58 am Post subject: Left channel only |
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Hi,
I received my fit-pc yesterday and it appears that i have the same problem :
left channel only (looks like 'mono'). After doing some testing with different OS, files, players, checking the software configuration, i'm sorry to say that it comes from the bus. Same as rik, one contact of the bus doesn't touch the jack, and after applying a little force from the inside of the bus, stereo came back. It seems that the right channel metal part of the bus is not bended near enough to the outside (i'll try to post some pictures tomorrow). Apart from that, it works fine (Slackware 12 + Xfce up and running ).
Update with pictures :
Bottom view :
Rear view :
As you may see in the bottom and rear pictures, there's a little rounded metal part that is not bended near enough the outside to be well connected to the input jack.
I just pushed that rounded part with a little flat screwdriver from the inside to the outside, and then the jack connects well. |
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gwarthur
Joined: 22 Dec 2007
Posts: 9
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| Posted: Wed Jan 02, 2008 2:52 am Post subject: |
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| irads wrote: | This is the audio jack used in fit-PC
http://anacapa.kycon.com/Catalog_PDF/STP3501.pdf
As you can see it is a simple stereo audio jack. The two leads in the jack should not short-circuit when the plug is out - if they do in your fit-PC you may send it by RMA. |
Irads, many thanks for your kind offer to correct this problem. I realize that in order to ensure that Compulab is the responsible party if anything should fail, you must discourage owners from opening the case and performing their own repairs. However, you must also be sympathetic to my situation: sending my fit-PC halfway around the globe to have a 40 cent part replaced is onerous and difficult to justify in terms of time lost and shipping costs. -GA |
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