SCPH-1001 PS1 help needed!

Hi all! I just received a SCPH-1001 PS1 that needs a new laser and I'm also gonna be doing a few mods to it. I have a couple questions about it.

I noticed that the holes for the S-Video connector found on the Japanese 1000 are still on the board. Could someone please tell me which hole is which so I can install a new connector there?

I know the PSOne lasers and assembly are compatible with this model but I also heard that the laser in my 7501 is compatible with modifications. What do I need to do to put my working laser in this unit?

I'll update this post if I have anymore questions. Any info will be highly appreciated!

 

Why not just check the pinout of the connector that goes there and you therefore know which holes you need?

Or better yet, just install an original connector so it looks stock?

 

I don't get continuity between the multi out and those pins. Same goes for the RCA jacks. I need to put the S-video connector there because I'm going to be repurposing the multi out for RGB only with C-Sync, H-Sync, and V-Sync on the Composite video/Luma/Chroma pins respectively.

 

But you wont get continunity if they are not directly connected... resistor, cap, anything will mess it up.

You just need to look at an svideo connector, look at the pinout for svideo and then this will tell you which pins are supposed to be luma and chroma...

 

It's not as simple as that, there are a number of other parts that have been removed from the board that are required to make the S-Video output function. The most difficult part is going to be the Y/C filter, although you could possibly remove one from a dead S-Video VCR.

I just made this photo - this should be all the changes, but it's possible I missed something.

 

I had a feeling there were more things to it. I actually saw all of those spots earlier and wondered what they were for. I don't have access to a S-Video VCR sadly and I don't believe I've ever seen one in person before.

Would it be possible to tap S-Video right before it goes to the Multi Out and wire it up to the S-Video connector? Also, where can I find a 4 pin miniDIN connector that would fit in the existing holes? The footprint seems different from a standard 4 pin miniDIN connector footprint.

On a side note, where can I easily tap C-Sync, H-Sync, and V-Sync?

 

Yeah, you could just connect it up to the S-Video signals on the multi AV jack - it's just that the original circuit was nicer because it had buffers and that Y/C filter in it, which gave you a much cleaner signal. I think the signals on the AV jack are just connected to the Y/C outputs on the CXA1645 through 75R resistors and some caps.

The simplest place to find C-Sync is going to be on pin 10 of the video encoder - this is going to be a 3V logic level signal. You could also tap all 3 off the GPU - if you have the newer SGRAM based GPU (CXD8561) then the pins are 156 (CSYNC), 158 (VSYNC) and 159 (HSYNC). I'm not sure about the pin numbers on the old GPU, but I would assume they are there somewhere.

 

Alright, thank you for the info. Do you know where I can get the parts to restore the original output?

 

Most of them are pretty standard - the biggest problem is going to getting a socket with the correct footprint and that S-video filter, especially since S-Video stuff isn't being used anymore. Everything else is easy to find - one thing to check is that depending on the board revision there might be a zero-ohm link on the back of the board shorting out the input and output of the Y/C buffers and if this is present you should remove it.