Demonic Audio from SCPH 1000 PS1

You should keep it like that, it's hilarious.

 

I can confirm swapping the SPU also fixed a sound issue with a SCPH-1000 I am working on today.

 

Just got another SCPH-1002 PU-8 with (presumably) this issue.
The audio is mostly fine, but there's a lot of noise and audio clipping during FMVs. Audio CDs play fine, but if I enable the additional effects like dome or hall it's possible to hear it too, although not as noticeable.

This seems to be quite a common issue. I'm not buying a lot of PS1 consoles and I generally try to stay away from SCPH-100X because the drives are never working good enough.
Anybody else with similar experience regarding failing CXD2922Q SPUs?

 

I have quite a few with the same problem. As far as I know there is no easy fix. Seems to be quite common with the SCPH-1XXX models unfortunately.

 

PU-8's should have the revised SPU already.
From the error description, I'd rather assume the SPU RAM chip!

 

That sounds rather interesting, reminds me somewhat of the old computer games in the early '90s. I can't really tell by watching your video, but out of curiosity, are you hearing both treble and bass or just treble when audio is playing?

 

Not all of them - I've seen (-11) PU-8s with the CXD2922BQ SPU on them.

 

Yea, BQ is already revised once, from the original Q. I only had bad Q's.

 

Ah, OK I was taking "revised" to mean the CXD2925. Thinking about it, I wonder if the "A" stepping part ever got into production? I've only seen the original rev nothing version and the rev B ones.

 

Well, I've never seen an A stepping. Sometimes Sony did that: Went straight from no letter to "B".

 

3x PU-7 here currently.But I can't reproduce your issue with SPU, maybe i'll find one faulty board later.


Btw: SCPH-3000 (JPN, PU-7) has a different laser (that plays FMV fine) than SCPH-1002. But SCPH-3000 is older than 1002 according to Bios date/ver.

Has SCPH-1000 same laser as SCPH-1002 ?

 

No - they are interchangeable, but the SCPH-1000s came with the KSM-440AAM pickup and the SCPH-1001/SCPH-1002s came with the KSM-440ACM installed. Confusingly, when they changed the design of the pickup from plastic to metal they didn't change the part number, so "KSM-440ACM" can be either the old one (plastic like the -AAM) or new one that's using a diecast metal sled.

The other thing is that the US and PAL regions didn't follow the Japanese practice of changing the model number when they changed the internal design, so a "SCPH-1001" or "SCPH-1002" could have hardware that matches the Japanese SCPH-3000, SCPH-3500 or SCPH-5000 depending on when it was built.

I'm sure there was a rev 'A' internally - what often happens is that you do the initial version and it (of course) has bugs - so you collect all the bug reports, fix them and do a "Rev A" respin. Then, before you get it out the door more bugs are discovered in the initial version and depending on severity you might decide it's best to just lose the Rev A parts and fix the new bugs too.