CMVS Help - Nearing the finish line

Phyeir · Oct 25, 2009

Ok guys, I'm ALMOST done. Decided to actually take a few hours today (even with my back tweaking something terrible) and get my CMVS to the power on point. And success! It turns on, no electronic burning smells or anything. Now, there's a few annoying things left over...

1) Sound is WAY LOW - Xian Xi said to grab from the headphone jacks, but I have to turn the TV up to nearly 100 on my TV just to get a decent sound and at that level (yes, slider is all the way up), I seem to be getting interference from radio signals (when I leave everything plugged into the arcade board without being on, could actually hear a radio talk show at that level). So, obviously, I need to move my sound, but I don't know where. I'm on a 4 slot board, so I have no guides to assist where to grab and grabbing continuity doesn't seem to go well.

2) Video is a little wonky - The video outputs and all, but I have some purple saturation to the right happening and just a general lack of sharpness on the picture. Took a picture to detail this. I'm on a Neobitz encoder, so I thought I was good on video, but maybe I just need to use some resistors on the lines to take this issue out? The general fuzziness really bothers me, it's like watching old antenna TV.

3) P1 port is on right, P2 is on left - I didn't rewire the controller slots, so I think this may be normal, it's just new to me is all, so just let me know I'm not crazy on this one.

Once I get this done, I'll take pics of this thing, it is a beautiful beast.

xiao_haozi · Oct 25, 2009

1) try grabbing on the other side of the slider attenuation. Then you shouldn't have such low volume sound. They should just be the tap points on the opposite side of where you grabbed now. If you are unsure I (or someone) can probably dig out a picture.

2) Did you try any other TVs by chance? Just curious, but I doubt it is a TV dependent issue as it's a color balance.

Phyeir · Oct 25, 2009

xiao_haozi said:
1) try grabbing on the other side of the slider attenuation. Then you shouldn't have such low volume sound. They should just be the tap points on the opposite side of where you grabbed now. If you are unsure I (or someone) can probably dig out a picture.

2) Did you try any other TVs by chance? Just curious, but I doubt it is a TV dependent issue as it's a color balance.

1) Do you mean grab by the slider or just go one step earlier in the line on the sound? Pic I tried using guide pics from 2 slot, but placements of things are different from what I saw.

2) Have no other TV to test the components on. I could to composite, but that's all I have on other TVs. If it's color balance, what does that mean I need to do?

Xian Xi · Oct 25, 2009

Where exactly did you tap the sound?

Also in the picture looks like the picture is too bright. What value resistors did you use on the Neobitz? Usually the stock 124ohm works good for both LCD and CRT.

But all in all the picture looks like it needs a better ground. You aren't linking audio and video grounds on the output are you? Sometimes it causes interference in the picture.

Xian Xi · Oct 25, 2009

Phyeir said:
1) Do you mean grab by the slider or just go one step earlier in the line on the sound? Pic I tried using guide pics from 2 slot, but placements of things are different from what I saw.

2) Have no other TV to test the components on. I could to composite, but that's all I have on other TVs. If it's color balance, what does that mean I need to do?

Grab the audio from the headphone jack, not the slider.

xiao_haozi · Oct 25, 2009

Xian Xi said:
Grab the audio from the headphone jack, not the slider.

That's post slider attenuation on the 4 slot too right?

Pre gives you the really low volume iirc. And doing post attenuation gave a nice level (when adjusted with the slider a bit).

Phyeir · Oct 25, 2009

http://img41.imageshack.us/img41/1303/cimg8066.jpg

This is where sound was.

I'm using the actual video ground (pre-resistor) placement on the board. If you can point where I SHOULD grab, I'll do it up.

Phyeir · Oct 25, 2009

Well, the sound issue is all cleared up (ran it right off the edge connector).

I also connected the video ground right to the edge connector (the +5V for video is also connected there), but the color is also still the same. I don't mind running off the edge connector, so if I cn pull EVERYTHING off the edge connector, would that help things?

Xian Xi · Oct 25, 2009

I pull everything off the edge connector when the board is enclosed.

Phyeir · Oct 26, 2009

Xian Xi said:
I pull everything off the edge connector when the board is enclosed.

I'll have to line that all up in the morning. If it's still an issue, I'll be back tomorrow night

Well, like I wouldn't be here anyways...

Xian Xi · Oct 26, 2009

Where did you tap the RGBS signals from? Pics.

JMKurtz · Oct 26, 2009

Post pics of the RGB taps and connector wiring. Interfeerence in component and svideo are normally signs of grounding issues.

Try using the common ground rather than the video ground.

I generally tap +5 & ground from a logic IC somewhere close to the Neobitz board is mounted to keep the wires short.

Jeff

Phyeir · Oct 26, 2009

Before, I was grabbing everything off from the actual pots pre-pot, so I had extending wires. NOW though, I'm straight off the board. But everything looks exactly the same. I reconnected the actual power cord ground (added an extra ground wire to given the whole board better grounding) and moved the video ground onto the video ground on the slot connect AND to the dedicated ground. In both cases, same exact look to the screen.

Image of board and wires clear of setting

Image of board in place (Padding still in place)

Xian Xi · Oct 26, 2009

What's with all the glue? Are these connections soldered or just glued?

Phyeir · Oct 26, 2009

Xian Xi said:
What's with all the glue? Are these connections soldered or just glued?

Of course soldered... the glue is to insulate and just added insurance. I did a light tug test to make sure connection were good.

Xian Xi · Oct 27, 2009

Is that a solder blob on your AD chip around pin 12-14?

Phyeir · Oct 27, 2009

Xian Xi said:
Is that a solder blob on your AD chip around pin 12-14?

If you mean on the encoder, no... stray wood piece, don't know how it got there, moved it off and everything is the same -_-

If that's not what you mean, would you happen to be able to point me to what you mean?

Xian Xi · Oct 27, 2009

It's wood. I'm at home now and can see that it is wood.

I've never worked with a 4 slot before but I can say that once in a while I get a 1 or 2 slot that needs the additional LM1881 sync cleaner to work right.

Phyeir · Oct 27, 2009

Xian Xi said:
It's wood. I'm at home now and can see that it is wood.

I've never worked with a 4 slot before but I can say that once in a while I get a 1 or 2 slot that needs the additional LM1881 sync cleaner to work right.

Where would one procure such an item?

Xian Xi · Oct 27, 2009

Phyeir said:
Where would one procure such an item?

You can order them from Jameco:

https://www.jameco.com/webapp/wcs/s...toreId=10001&catalogId=10001&productId=107140

You will need:

1 - LM1881
1 - 680k resistor
2 - .1uf Cap

Cut the jumper currently in the switch spot:

Code:

O  O  O
O--O  O

And change it to:

Code:

O  O--O
O  O--O

Xian Xi · Oct 27, 2009

Also the notch on the LM1881 will face the switch (top of the board).

http://www.jamma-nation-x.com/jammax/images/neobitzv2.jpg

Phyeir · Oct 27, 2009

Thanks man but BIG question.... does my board not having a switch possibly have anything to do with this issue?

Xian Xi · Oct 27, 2009

You mean no power switch? You should put one on if you don't have one.

Phyeir · Oct 27, 2009

Xian Xi said:
You mean no power switch? You should put one on if you don't have one.

No, on the encoder board... where the switch is, looks like it just turns on & off the sync cleaning, but wasn't sure. Mine is blank in that whole area (but part of it is from need for that chip & other parts)

Xian Xi · Oct 27, 2009

Right now the jumper just joins the sync from the header connector to the sync output from the sync cleaner.

CMVS Help - Nearing the finish line

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My only regret is that I have... Boneitis!

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My only regret is that I have... Boneitis!

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