Strangely, It didn't work with Q2 and Q3 so I removed them and R2 is directly connected to +5V. So mute input isn't an absolute need : I don't have any noise at all. Maybe other circuit could be better but this one works flawlessly.

I actually used that schematic initially and had the same issue w/ the Q2 and Q3. Not sure if it was me or if the schematic was just plain wrong. I actually liked this design because it is the only known version that is supposed to work for MAL (and come to think of it; my problem was that the board I made based from it gave me a negative voltage on the RCA jack so maybe it does work but I needed an MAL player to test it).

In any case, the Mute signal from what I understand doesn't appear to cause issues most of the time but I did have a problem on a Sony mod that I did w/ the built in AC3-RF Demodulator of which the initial start of a disc side would sometimes give me a loud digital pop and then everything is fine. I think the issue was simply because of the way the AC3-RF board interacted with my particular Demod board. After that, all my other AC3 mods had a good working mute point and I never got the digital pop ever again.

In any case, here is the AC3-RF board schematic that I found to work perfectly for me.



It's a bit different in respect that it uses two additional ceramic caps that I believe were intended for noise filtration off of the +5 and -5 volt inputs. This is also only meant for MAH players which is actually fine since most MAL players are only in Europe so I don't have to worry about it hear in the US.

But when you say, “ ...it's impossible to have closed caption on it...”, I’m not sure that’s correct. Every NTSC LD player is compatible with CC as far as I know. It’s your TV or external box that actually renders them though. Maybe I misunderstood what you meant.

Thank you for the info, I can't try it for the moment since I put my player under other players and don't have time for the moment but I take note and will surely try yours.

Very impressive.

But when you say, “ ...it's impossible to have closed caption on it...”, I’m not sure that’s correct. Every NTSC LD player is compatible with CC as far as I know. It’s your TV or external box that actually renders them though. Maybe I misunderstood what you meant.

The conversion back to analogue video is via an 8 fsc/9 bit converter (fsc = the multiple of the chroma sub carrier frequency).

Wow I never knew that, but then again I never had an S2, did have a 95 for a very short time but never tested it so we don't know about that either.

Did you get them before and it stopped now? Is it your TV, I thought that some newer TVs won't display CC but I may be wrong?

Hi,

I had to check in my LD S2 because of a sound problem : there was sound with Toslink out but not with RCA out : after troubleshooting I saw that some fuses (ICP N38) were burnt : 2 fuses for the DAC power supply : now replaced and working again.

So I took the opportunity to take a picture of the AC3 RF circuit : it shows where to place it. No need of such big resistors but I took what I had in my stocks.


And I figured out that Q2 and Q3 on the schematics are already in the LD S2 (check my first picture with red arrow pointing to mute picking signal), that's why they are not needed.