68kMLA Classic Interface
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| Macintosh LC 475 | |
Posted by: ironborn65 on 2022-08-26 03:22:52 I immediately removed the terrible battery connector. It needs recapping, it found there is leaking already but strangely it is working, HD spins with not weird noises MacOS system 8.0.  | |
| Posted by: MrFahrenheit on 2022-08-26 03:57:57 Nice! These LC475/Quadra 605 are my favorite 68k Mac’s. Enjoy! | |
| Posted by: pfuentes69 on 2022-08-26 04:05:15 Nice machine. It's the one I use the most. Always on my desk. I guess that thing connected to the battery holder is a coin cell wrapped in duct tape, right? | |
| Posted by: cheesestraws on 2022-08-26 04:13:12 Agreed with both @MrFahrenheit and @pfuentes69—the 475 is probably one of the best 68k macs for hobby purposes. It's robust, compact, easy to work on, not rare and pretty fast. I love the LC case(s) and form factor. | |
| Posted by: Jockelill on 2022-08-26 04:18:52 Love the 475! I have two of them, works great! You can trim it to 33Mhz by modifying a few resistors: "There are four resistor pads used in this modification. Surface mount (SMT) resistors are placed in these pads to pull "low" or "high". The pads are in sets of two, so you need to have a resistor on one of the first two and one of the second two. The resistors are either 300k Ohms (301) or 4.7k Ohms (472). They are the "0805" surface mount package. R22 (low) R21(high) R25(low) R24(high) 301 --- 301 --- low, low 20MHz --- 472 301 --- high, low 25MHz 301 --- --- 472 low, high 33MHz --- 472 --- 472 high, high 40MHz If you monitor Pin 6 of U17, you will get the following: low, low 9.982MHz so 19.964MHz high, low 12.377MHz so 24.754MHz low, high 16.425MHz so 32.85MHz high, high 19.964MHz so 39.928MHz" 40MHz creates other issues, so don't bother 🙂. | |
| Posted by: Phipli on 2022-08-26 04:26:50 If you overclock, you can try adding a simple heatsink. Use silicone thermal glue to stick something like a 40x40 heatsink on the processor. The fan in mine was really loud so I took it out, turned it upside down, peeled back the label and put a small amount (like, two tiny drops) of sewing machine silicone oil in the hub... quiet as a mouse now 🙂 
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| Posted by: pfuentes69 on 2022-08-26 04:48:51 I did some mods too to my LC475,,, - Full 68040 - OC to 33MHz - VRAM upgraded to 1MB - Quieter fan and fan speed controller - PDS Ethernet card - RASCSI It's so fun to tinker with this machine! | |
| Posted by: ironborn65 on 2022-08-26 06:01:24 thanks you all mates. I was not aware of the resistor swap to OC, I'll have some fun with it. (I did it for my 3 LC III though with success) I'll add a PSD Ethernet card. The PSU is ok but I was wondering if to replace the capacitors to extend his life MacOS 8 is not something I like, but I'll keep it | |
| Posted by: ironborn65 on 2022-08-26 06:19:57 I'm asking you here because I do not fine a suitable thread in the forums. Which liquid do you use to clear motherboards with ultrasonic cleaners? | |
| Posted by: Jockelill on 2022-08-26 06:23:30 I use IPA then rinse with distilled water. | |
Posted by: Phipli on 2022-08-26 06:28:00I'm asking you here because I do not fine a suitable thread in the forums.I've been using this : https://amzn.eu/d/bKutqhN This is an LC 475 by coincidence. | |
Posted by: pfuentes69 on 2022-08-26 06:32:37The PSU is ok but I was wondering if to replace the capacitors to extend his lifeI had to recap a couple of these and I'd say it's a must at some point. Did you open it to see how's inside? (specially on the bottom side of the PCB, where the cap goo trends to go) | |
| Posted by: ironborn65 on 2022-08-26 06:44:02 I read it's not recommended to use IPA with ultrasonic cleaners, "vapours could ignite" if in a non properly ventilated room... | |
Posted by: ironborn65 on 2022-08-26 06:46:50I had to recap a couple of these and I'd say it's a must at some point.yes, they do not look domed and I see not sign of leaking ... but I'll to the "upgrade" | |
Posted by: joshc on 2022-08-26 07:11:32I read it's not recommended to use IPA with ultrasonic cleaners, "vapours could ignite" if in a non properly ventilated room...I believe this is correct, IPA is not the correct stuff to use in an ultrasonic cleaner. However, I don't know exactly what is as I don't have one. | |
| Posted by: ironborn65 on 2022-08-27 09:48:50 Recapped, I run out of tantalum caps, it's ok tough Successfully overclocked to 33MHz 🙂 Are these heat sinks enough? which VRAM SIMMS should I look for for an upgrade? I have 832x624 256 colors  | |
Posted by: Phipli on 2022-08-27 10:10:21Recapped, I run out of tantalum caps, it's ok tough🙂 They're cute, but I'd try to find a bigger heatsink! With heatsinks it is all about surface area. For VRAM I'd start by browsing eBay, but Siliconinsider makes very pretty new ones if you're interested. | |
| Posted by: Phipli on 2022-08-27 10:13:44 This is the heatsink Apple fitted (when they did) to 040s back in the day :  | |
Posted by: cheesestraws on 2022-08-27 10:16:55I read it's not recommended to use IPA with ultrasonic cleaners, "vapours could ignite" if in a non properly ventilated room... I believe this is correct, IPA is not the correct stuff to use in an ultrasonic cleaner. However, I don't know exactly what is as I don't have one. Yeah, IPA isn't good. I'm not sure what is, but I know @Phipli knows 🙂 | |
| Posted by: Jockelill on 2022-08-27 10:17:35 I’ve used these: 
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