A disc that can be used to test PSX/PSOne for any laser alignment problem, test memory cards, test controllers (including analog if available), and do a test video and sound so one could check the playstation or accessories for problem? Just wondering but I'd imagine there's something.
No, because a CD like this it's useless. For testing laser alignement you canuse original psx CD and an oscilloscope for example.
I disgress: http://avaxhome.ws/music/format_bitrate/lossless/sony_test_cd_yeds_18.html That disc is used with an oscilloscope to adjust CD-PLAYERS. NO, they DON'T use games to adjust the consoles professionally.
Actually, the point of the disc is it's mechanical/optical characteristics. Burning a copy totally defeats the purpose of using a test disc, no ? It still allows you to test the audio circuit of the player with a burnt copy but obviously it will be useless for optical pickup adjustment. (basically, I did not bother downloading the image). Also PS specific test discs do exist that test the CPU, sound chip and RAM/ video RAM.
Not entirely convinced of that, it should still be helpful to adjust it. Obviously not quite a good, but better than doing it blind.
The main purpose of the YEDS-18 disc is Eye Pattern adjustment. For that purpose a backup won't cut it as it won't obviously have the same optical characteristics as the real test disc. If I am not mistaken, there's even a special type of test disc which made of GLASS. http://www.amazon.co.uk/Sparepart-Sony-TEST-YEDS-18-J2501307A/dp/B001DH5N3S Edit: How about this one, which is used for skew adjust on PS2 consoles ? http://products.pacparts.com/gld_dr01_skew_adjust_1104775014.php
Surely for arguments sake your drive doesnt read backups (cdr/what ever) and you use a CDR with the test data and calibrate using that - you will end up being able to read the CDR just fine. While it might not be as accurate as the real deal, I dont see how it wouldnt be better than just tweaking pots blind. Unless I am missing something?
My point is, the data in YEDS-18 disc is similar to the discs they sell to audiophiles with tones for speakers adjustment. But it has a special set of scratches to test the error correction of the drive and it's made in a very controlled way to make sure each unit of the disc have the same parameters. That's the point of the test disc. Make a standard reference for mechanism adjustment. Same with that 2k pounds disc (which is a glass DVD disc) that exists for the sole purpose of skew adjustment on DVD players (it's not a PS2 specific test disc).
No one is suggesting using a playstation disc. The disc in question has wave patterns you can measure with a scope, using a normal disc isnt going to get you that. l_oliveira, Several times I keep saying I know its not going to be as good and probably not for what its designed (calibrating something properly). However, most people here would be tweaking drives to read CDR's - which is what I am getting at and said several times. Which I think it would work to do... Dont get me wrong - I am not saying I am right, I just want to understand WHY this isnt the case - as it seems like it should be to me. But I am not experienced in calibrating laser units (but I do have a scope, but no test discs).
Well, maybe... But honestly (I started out like everyone here) adjusting a drive with a CDR will make it work with some discs and not with others. I've spent hours trying to fix such situations. Obviously I don't own a YEDS-18 nor that 2K pounds glass disc (imagine a worker on a official service center letting it fall and it shatters ... lol) so I am using pressed discs. The best way to proceed with discs for adjustment is you pick a set of discs and stick to them. After a while you will be able to adjust drives using the said discs, but then you will have developed a sort of "relationship" with the adjust discs ! lol The official adjustment discs are built with a set of characteristics in mind, making the "offset" for adjustment fixed. You will have to "learn" your discs if you're using different discs for adjustment.
I already sort of do that, I have several discs that read differently - between them I can usually get a drive to read most things. I was just looking for a better and measurable method, rather than trial and error :-(
They use a disc called SCD-2700 (taken from official service manual), and i think it's like disc that you linked but have a different purpose And i repeat, a CD like this it's totally useless because calibrating a drive using a burned disc it's the most stupid idea, so it's better use original disc to obtain an optimal value. The other method it's to spend a 2000 and plus of $ for a totaly useless disc that it's made for obtain the best AUDIO quality from you HI-FI wich help to reduce jitter and other problems that affect audio beacuse nowdays it's impossible find the same disc for calibration that sony uses in the past
Ah, I see - starting to make some more sense. I wasnt thinking universally read any CDR though, I am well aware of the inconsistencies - just against a few types and stick to those. Shame though, Id like a measurable and repeatable way to set it
They use a standard disc for calibration (that's what YEDS-18 is for) then a special disc which is specific for the system (the one you mentioned perhaps?) for testing. Newer PS1s have almost no adjusts so there's no point on using YEDS-18 on them. Yet they use it on the PS2 adjustments, along with that 2k pounds disc which is used to adjust the DVD laser. YEDS-18 isn't a burnt disc, it's a test disc manufacturated by SONY for service centers.
