K7S5A Front panel audio pin setting help

[maiku]

I recently bought a new case that has front audio and microphone plugs. I have a k7s5a v3.1a board and I'm afraid I'm a little lost with what goes where. The manual has this:

FP_AUDIO
MIC 1--2 GND
MIC-P 3--4 VCC
FPOUT-R 5--6 RET-R
NC 7--8 KEY
FPOUT-L 9--10 RET-L

On the mobo, it's printed like this (as far as I can make out):

MIC 1--2 RGND
MICR 3--4 RSU (or is it 8SU?)
LOR 5--6 INR
(blank) 7--8 (blank)
LOL-L 9--10 LIN

The wires from my case look like this:
Green Mic-In
Black GND
Yellow R-In
Purple R-Out

Blue L-Out
Red L-In
Black GND
Orange Mic-In

When I try plugging the R-Out, L-Out, R-In, L-In to their respective pins with the grounds in pin 2 and 7, the sound from my speakers gets noticeably quieter and there's no sound coming from the headphones I have plugged into the front of my case (I have the Green Mic in pin 1 and the Orange Mic in pin 2). The mic pins don't seem to matter whether they're in or not, the sound doesn't seem to work correctly.

I know this is kind of complicated to read but anyone have any ideas on how to fix this? I would appreciate any help.

Thanks in advance.

[uart]

Hi Maiku, saw this thread the other day but didn't have time to reply.

Yeah that should all work ok. Why dont you try testing the things one at a time, for example just hook up the line-out first and see if you can get that going. The mic should work too but you need to get the "mic" and the "micp" signals the right way around. "Micp" is a power (or bias) signal and normally goes to the centre section (or "ring") of the mini-stereo jack. These boards work best with the "three wire" type electret micophones (powered).

the sound from my speakers gets noticeably quieter and there's no sound coming from the headphones

Well the "noticably quiter" is due to the impedance loading that your headphones cause. The line-out is not really designed to drive headphones properly (very unforunate this as it would only cost about 10 cents more to do it properly). So there probably is sound comming out of those phones but it's just so low you didn't notice it. Turn off your speakers and then turn all your volume control sliders to max in the windows mixer, then you'll hear it but still not very loud.

BTW, I noticed you've got a line-in header too. I think that's a new one, I dont recall my previous k7s5a's having line-in on the front audio header.

Anyway I just checked with my most recent k7s5a and sure enough it's got line-in too. But there's a bit of a catch with it. I just gave it a quick test and no go. Intesting solution though, just plug a "dummy" jack into the rear line-in socket and then the front one will work. Must be a shorting switch on the rear line-in to keep it quite when not in use, the designers probably overlooked it's impact on the front audio, I've seen ECS/PcChip make this mistake before with front-mic also.