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atsampson
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Post subject: Re: CLD-s310s and NTSC Posted: 04 May 2019, 16:44 |
Genuinely interested |
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Joined: 08 Feb 2007, 17:24 Posts: 35 Location: Scotland Has thanked: 8 times Been thanked: 5 times
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There's a CLD-S315 service manual in the LDDB collection, so you could compare that to your player and see what is and isn't populated (follow the N/XP output from the mechanism control IC on the main board for a start?). Presumably the S310 doesn't have the horrid standards converter on the PALB board, but you don't want that anyway. One question is whether the firmware is the same for the S310 and S315. Looking at the pinout on page 46, the mode control IC has inputs to enable/disable various functions which are set using links on the FLKY board - and SW1 is "H: PAL model, L: dual model", which sounds hopeful. It would be interesting to see what it does with an NTSC disc with that link in each position...
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takeshi666
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Post subject: Re: CLD-s310s and NTSC Posted: 06 May 2019, 18:58 |
Absolute fan |
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Joined: 01 Feb 2018, 02:41 Posts: 1992 Location: Finland Has thanked: 183 times Been thanked: 386 times
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elahrairrah wrote: Gotta imagine it's nigh impossible to mod a PAL LD player to play NTSC and vice versa. Don't they spin the discs at different speeds? I thought of this as well, but I'm pretty sure the spindle motor speed is determined by a circuit rather than the motor itself, which again relates to altering the circuit boards.
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signofzeta
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Post subject: Re: CLD-S310s and NTSC Posted: 06 May 2019, 20:31 |
Jedi Knight |
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Joined: 14 Jan 2010, 09:44 Posts: 5985 Location: Ann Arbor Has thanked: 1292 times Been thanked: 1105 times
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Yeah. You can’t let yourself confuse the nature of NTSC/PAL with the way Region or DVD Macrovision works. An NTSC player isn’t “locked out” from playing PAL. It literally can’t do it, and yeah disc speed is part of it. I think most of the digital field buffer and comb filters and overlay generators are all region specific too.
The legacy that defines all of this is the frequency of the mains voltage. That determined the refresh rate of TV when it was invented, which meant that 50hz countries and 60hz countries would have different screen refresh rates, therefore one had more resolution, etc. Before quartz tuning the only clock most electronics had was the AC frequency.
A CAV disc is one lap per field, therefore frame rate determines RPM.
_________________ All about LD care, inner sleeves, shrink wrap, etc.
https://youtu.be/b3O-vHpHRpM
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jwhybrow
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Post subject: Re: CLD-S310s and NTSC Posted: 08 May 2019, 22:04 |
Third post and above |
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Joined: 04 May 2019, 09:26 Posts: 5 Location: United Kingdom Has thanked: 0 time Been thanked: 3 times
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So a proof of concept. This is with just the jumpers set to dual ntsc/pal playback. It plays! As expected, the picture is black and white and the speed is in fact a bit slower than it should be. This is where adding the ntsc timing circuits will give proper playback. Like I say, it's a handful of components and should result in a pretty nicely priced dual system player.
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