Here's Why My Apple Cd300E External Scsi Cd-Rom Drive Does Not Work!


  • 09-May-2022

Welcome back we have here been an apple CD, 300 a plus now I've got some pretty bad lighting there. We go it's got a nice look at that. This is the newer version of the CD. 300 I have an original one right here. This is what the original one looks like. This is the CD 300.

And of course, it's a caddie load model once Apple ended their addiction to caddy, loaded speed drives. They went to these anyway. This one doesn't work. It was made in June of 94. And it was originally sold with an entire multimedia kit.

I actually have the rest of the kit that this thing came with the speakers, the power supply and even the original cabling. Now, this drive powers on when you put a CD in it, it tries to load, but nothing happens. And what I found is that occasionally older CD drives can be brought back to life by cleaning the CD lens and that's something that I often joked off as quackery. You know, when these drives are much newer. So when I worked at Walmart back in the day, when I was in high school, we sold a lot of. Cd drive cleaning kits and people would buy them in hopes that these kits would solve their problems. Now, naturally, they never did I have never really had much luck with them until recently, good thing.

This thing smells a little burned actually smells quite awful I'm wondering if maybe I'm barking up the wrong tree. Well anyway. So what I found is that some of these CD drives would the lenses would fog up over time as the plastics and other materials in the drive begin to out gas and that's. Something that wouldn't be fixable with a CD lens, cleaner, ironically, because the one thing that they would actually solve the one problem. They would solve requires a little of alcohol. And those CD lens cleaning discs are often dry. And they just brushed dust off the lens, which as I said, earlier, doesn't, usually solve any problems at least not in my own experience.

Well, my guys out allies that was saying there's been a couple of CD players that over the years I brought back to life by cleaning. The lens, especially if the device was used in a smokers home, and it doesn't appear to be the case here, there's, no evidence of that. So I'm going to pop this cover off. Let me get to the cables inside.

It smells a little bad, though like something blew up in it. You know, what I'm gonna I'm going to go for broke I mean, the power supply works. We know that I mean that that's a definite definitely works. Now let's get the cables I have to remove the power supply.

Just a couple of connections. Just take this off as. I said, this is kind of a Hail Mary pass let's get some light on that lens, it's, not foggy, it's, actually quite clean. What you want to see is a slight rainbow effect and that's how you know it's clean. And it looks pretty good to me. Yeah, I mean, there's, no reason why that shouldn't work, so there's something else going on with this Drive I, don't know what this let's take a look inside see if we can't find anything obvious, it's, never it's.

Never something obvious. You know that you know that right, it's. Never something obvious like a stuck stepper motor, or something like that, I mean, that think of it come to think of it guys it's like this just clips on remember if the separate motors frozen, it didn't seem to move very easily. And you know what the stepper motor is gear, driven, so it's, not going to move easily let's move that out of the way and take a look at this board.

It does melt burn those it's like something really funky happen to it. Something awful happen to it. Tell you what I'm going to do. We're going to clean that laser lens anyway, and then we're going to put a disc in it and see what the hell happens. Okay, so what I'm using here is a medical grade cotton, swab just gently buffing that lens. So as I was saying, out gassing of the chemicals used in the manufacture of these devices happens all the time. Now if you've ever bought a brand-new car, you'll know, exactly what I'm going to say what I'm talking about it's a little better, I mean, it wasn't bad to begin with, but camera could be very.

Sensitive, okay, when you buy a brand-new car, and you leave the windows up, you can have the car professionally detailed right? Put the car in the Sun for a couple of hours a day, direct sunlight. And over the course of about a month, you'll, notice, a haze form on the inside of the windows. And the reason that happens is there was which of those new plastics and leather and cloth. And all that all the materials that the foam, the carpets everything chemicals begin to leach out of these newly manufactured. Materials which is what also causes that new car snow that we all know and love anyway.

So what ends up happening is all of that all of those chemicals form a haze of film, if you will on the inside of the cars windows and yeah, that's the downfall supplying a brand-new car aside from the massive depreciation hit me take and the cancer that is allegedly caused by those chemicals, all very wonderful things. So let's put this back together goes on it's, just a standard small see if that laser does. Anything at all and I'm, blindly reaching around this power supply, which is live I, just want to point that out there.

We go let's turn this light off there. We don't need that there we go. Okay. Laser diode is not burned out.

That's, good. Okay, here's a copy of Mac draft. This is on an original production CD. This is not a burn CD. The CD does work. So before you guys say anything about that, okay, stepper motor is stepper II it's, trying to find track zero still looking. Okay.

You know what? Okay, here's. The. Thing the stepper motor isn't doing its job, stepper motors, the problem or whatever is driving it because it's not moving to the center of the disk it's, not moving at all so let's talk a little about how CD readers work. Okay. So as you know, as you figured out by now, I hope a laser beam, or at least the optics of the laser beam are mounted or suspended by Springs, which is sandwiched between two electromagnets and I. Believe there's one on the bottom as well.

And that allows the laser beam to be. Placed electronically into position to read the disk. So it allows it up to for the sake of this video, let's say, an eighth of an inch forward and eighths of an inch backward, and it can go up and down as needed to focus properly. And once it latches on to a readable track, what it will then do is it will start to follow the disk.

If let's say the disk gives warped or the track is slightly off-center you're. Going to find that when this is reading the disk this entire assembly is wobbling with the disk. And once it reaches its inner or outer less it, or before it reaches that point, it sends a signal to the stepper motor to bump it back a track or step or two. And that allows seamless operation without a motor that is without a smooth running motor. Okay. So the stepper motor that drives this assembly back and forth moves.

You know, let's say, it'll, move. This assembly let's say, 1/32 of an inch at a time, just for the sake of we're throwing out fake numbers. So it goes.

Boom, boom, boom, boom, boom. Just like that, rather than get continuous movement like that. And the in between movements in between steps, this device here will actually relocate the laser beam seamlessly using voice, coils or electromagnets. Okay, all right.

So we're going to do now is we're going to try to get this all apart I want to get I want to inspect this motor and see if I can find anything wrong with it. What I expect to find isn't necessarily a smoking gun, but what else what do we have to lose at this point? So let's, go ahead. And pull this all apart RAN here is driven by this motor and there's, a limit switch over here that tells it when to stop. So what is good? So what is supposed to do is drive the laser assembly all the way inward until it hits.

This switch it's, not doing any of those things. So what we're going to do is we're gonna manually power this motor using a double-a battery, that's 101 and a half volts if the whole rack-and-pinion thing works, smoothly, we'll know. So what's interesting about this. This design is it. Uses not a stepper motor, but a standard DC motor, nothing, special just apply positive and negative, and it'll move. Whereas a stepper motor move was in predefined movements in steps. This one just moves until it stops.

So what it probably does it supply a, you know, like a square sine wave, you know on off on off to the motor as needed I'm thinking, that's, how it works. Well, let's see if the motor even drives it, doesn't know, there should be some movement here. There is nothing I. Think this. Motor is bad, tell you what I'm going to do I'm going to give it a 9-volt.

So what it does is it applies current to the motor in varying polarities as needed. So to move backwards, it might reverse the polarity to move forwards. It goes.

Yeah. Nothing. What the hell this isn't something you see every day, guys, mark your calendars, he saw it here idiot tries to repair a CD-ROM drive the bad motor. So there's a little. Okay, it's glued in place.

All right, no big deal. Oh, my god I found. The problem I found the. Problem it's, not the motor it's, not the motor nope. I'm going to show you what I mean I found the issue all right for those of you who are familiar with Bell, &, Howell projectors, you'll know what I'm about to say, maybe not let's power up the motor real quick, motors, fine, okay, motors. Good motor is not the issue all right? Let's have a look.

So what we have here is a split nylon gear. Now this is a helical cut gear designed to drive the actuator. Unfortunately, this is a common issue. Nylon tends to. Split or shrink and then split around whatever shaft is mounted on when exposed to oil-based lubricants. This is really sad. Can we fix this gear?

Well, no, we's just not fixable. The only way to fix this drive is to replace the gear with a brand new one, or even a 3d printed one, unfortunately match yeshiva CD-ROM drive gears. Calm is fresh out of gears and I, don't know where I could find or even make an STL file for this I don't have the skills needed to do that. So printing a 3d printed gear is. Just not an option, not right now, not with the budget I have to fix this thing. So I, don't think we're going to be able to have much luck.

Here I am going to try to glue the Kerr back together because why not here we are. Okay. So we tried to glue the gear back together and that required cleaning it thoroughly in boiling water and degreased, and to get all the grease out of it, and we're going to try this.

This is just we're just having fun here at this point, I don't think we're going to have much luck. So let's. Glue that gear back together, we'll give it about an hour or so to cure we're going to compress it with a clamp and see what happens. But no guys.

Unfortunately with these gears, if is they start to shrink like that, you're never going to get the proper tooth spacing ever again. So it will never mesh with that worm gear again, but we're going to try because why not we've got nothing to lose and everything to gain little pro-tip when you're screwing things into plastic like reassembling them, here's. What you got. To do you got to remember to do this every time, because if you don't, what you're going to cause yourself some major headaches, you've got to put the screw in the hall and back it off reverse the direction until it drops into its original groove like there. And then screw it in if you don't do that it's going to try to make a new track, which can actually split the assembly that you're spurring it into you don't want to do that.

Bad news all right, let's. Go ahead and put our jumper Clippers to the motor all. Right and we're going to use them. S, whose have one half thousand nine bolts we're going to try to see if it still works? Well, it's not moving could be too tight.

I, move the gear. A little enough power, I wonder, why Motors warming up, so it's getting power? Alright. So after much messing around I have got it in it to a point where the shaft appears to spin, nice and freely that's, where we need it to be. So now we're gonna start reassembling this thing. And hopefully we get some gods, the positive results mean, Make sure that these aren't locked good for future reference, it would be easier to assemble this.

If we had taken it completely apart, we didn't do that. Yeah, you don't have to do that. I think, oh well, put bone connects to the microswitch bone. Okay, all the hard parts done. Good. Alright.

The sad truth is the gear has shrunk enough, just throw the tooth gap off the spacing. If you look closely at the gear and really look closely find that these teeth here are all evenly spaced and all of a sudden, oops and. The other cracked you to open up a little, so it's, not gonna work, hey, you know what I gave it my all I think now here's. Interesting, an interesting point could one be 3d? Printed? Yes, yes.

A new gear could be theoretically, 3d printed for this machine. Oops, in theory. Yes, it could be done. And yes, it would be great. It would be golden if you functional again, perhaps, but would it work reliably probably not at least not with an inexpensive 3d printer with the quality that they offer, so I, don't know, I. Don't know, I have two good running caddy drives, so it's, not like I need this thing to work, but I kind of wanted to save it, because it was a nice little unit if I could find another CD-ROM drive to stick in here. I think that'll be great it's.

A nicer it's, a nicer more compact case, I like that about it. But this is not good. This is bad news. Bad news, take another look at that gear. What again, yeah, a little of leaching of the yeah, you can see that those two teeth are just widely, and they're just.

Wide spaced and it's getting stuck right there. Yeah, don't think there's much I can do for it? Unfortunately, yeah, yeah, it's definitely a cabbage there and did the gear break again. Did it open up to the crack open? Did it fuse?

Or did it open let's? See? Unfortunately, with a deformity elf used, it feels quite nicely in fact, but with the deformity like this, if that gear, doesn't mesh, right, it, never it will never work. So you have to be really precise, I have nothing to fix it with.

This is unfortunate if I. Could figure out who the original drive maker was I could probably find an IDE version, and then maybe swap a few parts around, but I don't know who made this drive it's a mystery to me I, see what looks like Thais a no I'll see a any chip there perhaps could be a any if it says, Apple, CD, 300 made to Apple specifications. Oh, here we go it's, the mates China Kabuki and there it is Mutsuhito.

Aha. Well there it is all right? Well, hey, you still got a good enclosure out of it. I could do something. With that you sir you're a bad, Drive, bad, Drive.

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