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Sony MegaStorage 400 Disc CD Changer

Restoring, testing, using, and playing with a 400 disc CD changer.

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The goal of this project is to restore a Sony CDP-CX400 CD changer to working order, learn how best to use it with my CD collection, and make a few upgrades to it as I go.

While touring a relative's house for the first time, we came across a closet full of really cool older stereo equipment. In there was this old 400 disc CD player from the year 2000. I used to have a 300 disc version when I was younger and loved it. I asked if I could buy this from them. He said to take it home, and if it works, pay him for it later. I got it home, and found it had a "Loading Error" and another error I can't quite recall. Both were caused by degraded drive belts. I was able to get it working well enough to justify ordering new belts, but not until after I'd experimented with making custom temporary belts for testing. So far it has been shuffling between about 70 discs, for multiple days. Aside from my temporary belts failing, it has done just fine and earned a restoration and many more years of service. Playing with it has inspired another project that I would thoroughly enjoy: 300 disc 4k Blu Ray PC drive for ripping, burning, and playing back large collections of various discs.

After getting the player fully working, and replacing the missing remote, the plan is to play around with it. The plan is to hook it to my PC with an optical audio cable over USB and use Icecast to stream it's output over the internet so I can listen to my CD collection at work. I may also emulate an IR remote that I could control over the internet so I can control the player remotely as well. There is no practical reason to do such a thing, but it would be fun and interesting.

Currently it is hooked to a soundbar over optical audio. I'll be getting an optical splitter so the player can be hooked to the soundbar, my wireless headphone transmitter, and my PC all at once for many listening options. I've found that having a dedicated physical media player has had a serious positive effect on my life. I press 3 buttons and have an endless stream of all of my favorite music, which motivates me to get up and do something. It's basically a private jukebox in my home. There is a long delay between tracks when changing discs, but I find I don't notice it after a while. These players can actually be connected together to shuffle tracks between multiple players and eliminate gaps by queuing up a track on one player before the other gets to the end of a track. These players were pretty advanced and are still very interesting to this day. You can add the currently playing track to a "Hit List" with a single button press, and remove with another. I find this very useful when I just want to make a list of my favorites. Overall, this CD player has been a fantastic addition to my physical media collection and life.

  • DIY Drive Belts 2.0

    Dustin07/03/2023 at 20:18 0 comments

    After running a loud, sticky, stressful strip of Gorilla tape as a loading mechanism belt, it finally failed on me. Time to try something else.

    This morning I took all 60+ discs out of the player for the 2nd time, and set about creating a better belt to keep this thing churning out the tunes while I wait for the proper belts to arrive in the mail.

    The problem with the previous tape belt is that it was very sticky. It would cause serious drag on the mechanism, slow things down, make a ton of noise, and eventually slip off the pulleys. This new belt idea came about as a simple improvement on the original. I took some electrical tape, and wrapped it backwards around itself in a thick ring. I then wrapped another strip around the sticky side to cover it. After the, I stretched and worked it a bit to get out air bubbles and such. Using very sharp scissors, I cut a very thing ring off of the loop and used it as a belt for the disc loading mechanism. This created a very strong, soft, slightly stretchy multi-layer belt that seems to have worked very well. I normally avoid using electrical tape for anything, but here it seems to work just fine. The player is far quieter and faster. I don't worry about extra drag burning out the motor either.

    Wrapping and cutting such a small and sticky belt was very tricky. It was well worth it, as I now have an extra wide belt from which to cut other belts if needed. Even though the new belts are on the way, I think I will leave the new tape belt in until it fails to see just how long such a thing might last. I don't know of anyone else testing such a thing, and it won't cost me anything to test it and report back.

    I may have thousands of songs in my digital collection on my Jellyfin server, but the CD experience with this has just been far better for me. I've even burned some of the albums I bought from Bandcamp that don't have physical releases and have been thoroughly enjoying them. There's just something very satisfying about this thing swapping discs around all day. It also looks great under my SOny 4K blu ray player. Looking forward to many years of listening with this thing.

     I'll be ordering a replacement remote for it soon, as well as a Keychron C1 Pro keyboard with PS/2 adapter for use in naming discs and such. Some other upgrades I have in mind are upgrading the dim blue LED on the inside of the player to a much brighter white LED that can effectively light up the entire loading area as it gets very hard to see in there at times. I'll be ordering an optical audio splitter so it can output to my bluetooth transmitter, soundbar, and PC all at once. The plan is to be able to stream it's output over the internet so I can listen to it while at work and such. Just looking to have some fun with a 23 year old piece of very interesting technology. I'd love to integrate it's output into my Jellyfin server as well. I may be able to set it up as a TV tuner in Jellyfin and stream it out over the internet as a TV channel as well. Could be fun to put a microphone in it and mix the sounds of it changing discs in with the music stream as well. The possibilities are endless with modern technology. If the main mechanism dies and can't be repaired, I plan to put in a 4K blu ray drive to extend it's life far into the future.

  • Initial Testing and DIY Belts

    Dustin07/03/2023 at 20:02 0 comments

    I am going from memory from about a week ago, and much has happened since then.

    When first plugging in the player, the various motors spun up, but nothing of consequence came of it, and the player errored out. It came without a remote, and was entirely useless.

    Knowing a fair bit about how these sorts of devices work, I figured it was bad drive belts. It is 23 years old, after all. I was right. One of the little black belts had fallen off the pulleys that loads the discs, and the one that spins the carousel had melted. I took the stretched belt from the loading mechanism and put it onto the larger carousel pulleys to get the carousel working again. I was still getting the "Load Error" of course. After digging through my entire apartment for materials to make a temporary belt out of, I came up with tape. I wasn't going to order new belts for a player that might have far more wrong with it. I carefully cut very thin strips of Gorilla tape and made various sizes of super sticky belts until I got one that fit and didn't slip off the pulleys.

    I ran a few different versions of this super sticky belt for about a week, until today, when that finally fell off and refused to stay on.

    I initially had serious problems with the discs skipping as well, so I tried cleaning the lens. I started by just taking a clean cotton swab and gently spinning it on the lens. This was better, but there was still much skipping. I then turned to a glasses lens wipe and gently scrubbed the lens with that, and let it dry. There was a significant improvement, but there were still a few skips at random. Another good scrubbing got it working well, and it hasn't skipped in about a week of near constant use.

    With the lens restored, new belts on the way, a replacement remote found, a PDF copy of the manual, and much new knowledge of this obscure device gained, I've been happily shuffling almost 70 discs nonstop for days now. Considering that these players go for about $200 to $600 USD these days, I'd say I got an amazing deal on this one.

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gtracy wrote 11/17/2023 at 21:29 point

I have the identical changer. I've had it for several years.

With it I also purchase the SAVR interface by BlackBoxDesigns which allows me to control the changer via the control-i slink interface using RS232 (remember that technology). I also have both the windows and the linux versions of Michael C McCain's Music Library software which works well with my setup.

I have just brought all of this STUFF out of storage to load up all my Christmas music for the coming season. It will be good to hear a lot of it again. 

I kind of like having the old CD Changer and I need to string some optical connections to a couple of receivers.

Going forward I would really like to see someone create a proper IP interface to control the CDP400 via the slink system. I think an ESP32 or even a Raspi Zero would do the job nicely.

I have a spare intel NUC that has an installed RS232 interface that I plan on using for now just to get everything going again.

The SAVR has a custom programmed PIC controller to do the job and unfortunately the two brothers that sold them are no longer in business.

So many things are going retro these days and I would be really glad to be able to breath fresh light into the old CDP400 again.....

Thanks for posting this and I look forward to more of your adventures. If you are looking for interface data for this I have a lot of it that I collected over the years. PM me if you are interested.

Glenn.

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beau.moore wrote 03/06/2024 at 23:13 point

I have a BDP-CX960 BD/DVD/CD changer with an IR receiver port on the front like the Sony CDP-CX400. I bought a BroadLink RM4mini Smart Remote Hub from Amazon for $30. It allows me to control the changer through my phones and tablets via the LAN.

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