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| Author | AppleCD 150 (Read 48348 times) | ||||||||||||||||||||||||||
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ShinobiKenobi
256 MB  Posts: 362 System 7 fan 
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on: October 11, 2024, 00:36
I found another AppleCD 150 in my old stuff. This one actually responds to when you put a CD caddy in. Unfortunately, after several seconds, it spits the caddy back out. So that's a good sign. That's more than my other AppleCD 150 does. Apple System Profiler recognizes it also, which is another good sign. I blew compressed air into it, but that didn't help, so I took it apart. I blew it over the lens. I also took the circuit board out to look at it. There looks like possible corrosion on a few chips. Just to make sure, is there anything to installing this? I just plugged it in and turned it on. Does it need an extension or anything for it to work, or will the TLC fix it? Thanks! Edit: When I get home, I'll post some pics of the circuit board. |
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Johnny7
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64 MB Posts: 78 System 7 Newcomer!
Reply #1 on: October 11, 2024, 01:52
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@ShinobiKenobi Yes, you need the CD-ROM extension. The "universal" version 5.3.1 should work just fine. Now, here's the absolute truth. It needs a recap. There about 9 electrolytic caps on the circuit board. The only thing mine would do is eject the caddy too. If you search eBay for these MAC CD machines you'll see that every single listing states the same thing; "it should work as it accepts the caddy but then ejects it but that's probably because it's not hooked up to a MAC". I fooled about with mine for a few months until I finally removed the board and found that all the solder on the leads were all very dark grey. I think I was lucky as they had still not "leaked" and destroyed any traces. Had it recapped by Acill (he's a master at recaps - Amiga & Mac). I might be able to give him a heads up and get his personal email if you're interested and if you're not on one of the Amiga forums. When I got my board back, I reinstalled it immediately and it worked perfect! I still have it! If you're interested I can dig all the hi-res photos he took of the board while he had it.
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ShinobiKenobi
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256 MB Posts: 362 System 7 fan
Reply #2 on: October 11, 2024, 05:16
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@Johnny7 Yes, please, I'd love to see the pictures. Thanks for your help. Here are the pictures. You can see some corrosion/discoloration on the pins of the 7805 voltage regulator in this first pic. http://revontulet.org/2024/10/11/24bfacfcc9dd458d8b6f7b53f1b8449b.jpg In this second picture, you can see some discoloration of some of the pins. Mostly from pins 22 - 28 of IC304. http://revontulet.org/2024/10/11/5cc0b57ff02147dc8b48824b6b260c33.jpg There is some bubbling on the other side of the PCB, as you can see in the third pic. http://revontulet.org/2024/10/11/cfe3bf460ca345efa42c4a4d636637b5.jpg Worst-case scenario: I can try to run some wires if the bubbling is too far gone. Edit: I removed the "s" after "http" in the urls.
Last Edit: October 11, 2024, 10:08 by ShinobiKenobi
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Johnny7
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64 MB Posts: 78 System 7 Newcomer!
Reply #3 on: October 11, 2024, 06:16
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Definitely leaking caps! There is a bit of corrosion on that VR most likely from the nearby caps - the voltage reg itself would never leak and corrode like that. The cluster of 4 caps appears to have leaked badly as seen on the bottom of the board. It's kind of odd that there is so much bubbling on the underside of the board directly below the cluster of caps yet there is no visible corrosion around the 4 caps. Hard to tell what's happened without removing the caps. Can't tell the extent of damage on the underside as you have to carefully scrape off the green film to examine. However, even if you repaired any trace damage, all the caps have to be replaced. Is there a total of 9 caps? Is this a job you can perform yourself? I attached a couple of your pics showing the culprits. I'll post again with some of my pics. https://revontulet.org/2024/10/11/c94c11b70bb942ecbd45add88bf95d71.jpg https://revontulet.org/2024/10/11/04829aa6eab24ccdb8e68f035a3d2329.jpg
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Johnny7
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64 MB Posts: 78 System 7 Newcomer!
Reply #4 on: October 11, 2024, 07:04
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A few pics of AppleCD SC recap... Near Voltage Regulator https://revontulet.org/2024/10/11/d09fd45040334c8f856404d18ef0f69b.jpeg Some Cleanup https://revontulet.org/2024/10/11/ad1db4e8a0144bd6a791e45f2ec2131d.jpeg Recapped Board https://revontulet.org/2024/10/11/77cd42d3905d46d8a1435a89cb4e747a.jpeg Operational! https://revontulet.org/2024/10/11/fdc33589f56343dbb12c3a5d30d839b3.jpeg
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Bolkonskij
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Administrator 1024 MB  Posts: 2023
Reply #5 on: October 12, 2024, 10:25
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Great job getting it back to life! Always a pleasure to see an oldie like this spinning up again :-) I think it's hard to understand how "futuristic" these CD-ROM drives appeared to us during the early 90's. I still remember placing our Apple CD300 next to the family's LC and thinking about the vast possibilities this would open up now. (a lot fueled by misleading marketing claims like "500 floppy disks fit on a single CD!"- as if that by itself would make the medium "better")
Last Edit: October 13, 2024, 13:05 by Bolkonskij
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ShinobiKenobi
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256 MB Posts: 362 System 7 fan
Reply #6 on: October 13, 2024, 04:40
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Thanks for the pics. I'm glad it's back to new!
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