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Old 21st October 2003, 06:38 PM   #1
r0cket- is offline r0cket-  United States
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Default CD player top load conversion

I'm considering modifying a caddy-load CD-ROM drive here into a top-load unit, mainly just for kicks, but also to see how well it works as a a transport for CD audio (the drive is one of those old NEC SCSI units that reportedly do make excellent transports, so I'm fairly hopeful). Anyway, I've about got it figured out, but I'm still a little fuzzy on how to get the top portion of the clamping mechanism to drop into place. With this drive, of course, the 'top portion of the clamping mechanism' is just a little metal and plastic disc integrated into the CD caddy, so there's going to be some work required there. Now I think I've seen some commercial door/clamps meant for DIY CD player projects, which might be ideal, though I can't seem to find the link anymore...

Anyone out there done a conversion like this? Not necessarily even with a caddy-based drive, but even just a tray-load? How've you dealt with the clamp?

Also, if anyone has any links to pages detailing any sort of top-load mods, I'd love to see them.

Thanks,
Matt
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Old 21st October 2003, 06:49 PM   #2
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I'm not sure if this is what you're looking for.
http://www.ne.jp/asahi/sound.system/...t/cdmbase.html

Translation (very funny ): use Babelfish.
http://babelfish.altavista.com/babelfish/tr

Greetings

Jan
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Old 21st October 2003, 07:58 PM   #3
EDUM is offline EDUM  Netherlands
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Hello r0cket-,

You have several options depending on the disc clamping mechanism you have and how professional looking your end result should be.

-Use an old magnetic clamp from a scrap player (if the top of the turntable is iron/metal of course.

-Use a loose weight with the correct hole in it. You don't need to use a lot of pressure to keep a disc in place

I used both solutions in a lab situation where the covers /clamping mechanisms where always off anyway. It works fine.

If you realy want a nice and shiny solution there is some serious mechanical work to be done indeed.


Have fun!

Ward
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Old 22nd October 2003, 01:51 PM   #4
LeoJar is offline LeoJar  Canada
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Here is my top loaded CD PLayer using NEC

http://www.geocities.com/leojar2002/Cd_4x_top.html
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Old 22nd October 2003, 09:04 PM   #5
r0cket- is offline r0cket-  United States
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Quote:
Originally posted by LeoJar
Here is my top loaded CD PLayer using NEC

http://www.geocities.com/leojar2002/Cd_4x_top.html
Indeed, that's exactly the drive I have.

Could you describe a little more the mods you made to the main PCB and the digital output section? I notice a link to another page describing the mods to the digital output, but unfortunately it's in Chinese, which I can't read.
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Old 23rd October 2003, 08:23 AM   #6
LeoJar is offline LeoJar  Canada
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Only this drive is worth to be modified!

Indeed, there are not many things you need to modify.

I knew which article that you read which is in Chinese.
The modification is same to what I'm doing...to reshape the digital output.

Next step is making an internal DAC for this drive and using TDA1541Ax2 and tube IV configuration
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Old 23rd October 2003, 09:47 AM   #7
r0cket- is offline r0cket-  United States
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It does seem to be a rather nice drive, the transport unit especially. I plan to replace the power supply, relocate the control buttons and display, build a new chassis, etc. I've been thinking about digging a bit deeper into it and seeing if it's not possible to get some more information (like track length or a timer or something along those lines) from one of the controller chips, running that through a PIC and onto a better display, but that's way beyond my abilities at the moment.

Anyway, do you have a schematic for the modification to the digital output? I'd like to give that a shot, but I'm not quite experienced enough to figure it out from the pictures and descriptions I've seen.
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Old 26th December 2003, 08:14 AM   #8
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Wink Just what I was looking for

I'm trying to the exact same thing, BUT heres my problem I got a drive and a walkman cd motor (top load). I would like to know if it is as simple as I think it is?
Is the motor standardized? If not how do I find the perfect match.... Etc. Etc.

Eventually I will "truck" with the tray hardware later.
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Old 26th December 2003, 04:59 PM   #9
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Hi,

I've seen top-load cd-players also used by sony.
I always wondered what advantages it brings with this kind of cd-loading.
Exceptionally with use of dvd-sacd players, because these players spins cd's real fast.

Greetz,
Remco Blankesteijn.
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