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Jinnai

6502
  • Content count

    148
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  • Gender
    Male
  • Location
    Colorado Springs
  • Interests
    Vintage computers, woodoworking, anime

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229 profile views
  1. Jinnai

    Ext floppy drive stuck?

    You might be able to, I'm not going to say you can't! But what I do is, I use it to dilute the old grease, it's good at that, and then wipe it off and for actual lubricant I use white lithium grease, available at auto parts stores. It works well.
  2. Jinnai

    PowerBook 3400c Repair Stories

    I had a Classic II that booted to a gray screen and the issue was either RAM or a dirty motherboard, I'm not sure. Is there any chance the issue is caps? I only know about caps so... I hope you can figure out the issue.
  3. Jinnai

    68LC040 in Centris 660av

    It's toxic? I haven't been very careful about contact with it...
  4. Jinnai

    Rusty Macintosh SE/30

    Thanks! It does look pretty nice. Although it is a lot easier than troubleshooting power supplies For reference, it was about 8 hours in a wastebasket of vinegar, then washed and dried, then sanded with a sanding sponge.
  5. Jinnai

    Rusty Macintosh SE/30

    Hey sorry for the late response! Thanksgiving kept me busy for a bit there. Although Thanksgiving break was what gave me time to work on this; now I have to go back to school so I'll have less time. I'll take a look at the schematic. Hopefully I can understand part of it. I did clean the ROM socket and contacts. This motherboard was in very poor condition before, so I'll have to look closer for rotten traces. I had a pic of the motherboard before, but I don't know where it went. I replaced the caps. I wish I could try replacing the multiplexors, but it has never given a chime of death, either the normal one but distorted, or none at all... I'll try to get a pic of the board, but my phone camera is rather scratched up and blurry. I must say, it's sometimes booting, but when it does, while it works, the boot chime sounds distorted, kind of grindy. In the OS, some sounds sound normal, but the more plain beep sound sounds a little like that, though not as much. The CRT neck board still has some issues with rescan lines. The problem is not the analog board, so I'll try replacing some other things on the board, since I already replaced the transistor. The PSU is also not working - I'm currently testing with one from an SE. It's showing between about 0.8 and 2 volts on my multimeter, so it's operating, but the voltages are far too low. Any ideas on that? In positive news... here is the frame! Before: After:
  6. Jinnai

    Rusty Macintosh SE/30

    That book looks incredible. Thanks for telling me about it; I go through a lot of Macs! Already ordered a copy. Although, I wonder how many of the parts it mentions are still available.
  7. Jinnai

    Rusty Macintosh SE/30

    Well, I already recapped the board, and cleaned it, so I don't know...
  8. Jinnai

    Rusty Macintosh SE/30

    Franklin, I didn't think of that, good point. That would certainly kill the HDD judging from the rest of the case. I might take you up on that, I'll see what I have. I have two or three spare drives, though I think most are 800k, but the issue is, while I can swap parts, I cannot align them, I don't have the tools or knowledge, so their usability for parts is a bit limited. LaPorta I did see the post, thanks! Right now I'll try vinegar though, as it's cheaper and not terribly important right now... I really don't know what result I'll get. I was staying apprehensive about the motherboard, and right now I can't figure out how to get past this: Unfortunately I don't have an oscilloscope to test anything. It does the same thing with or without the ROM module, so I don't know if it's an issue with the ROM, or the motherboard not getting to the point where it can use the ROM. It was working last night but apparently stopped; perhaps the motherboard should be washed again.
  9. Jinnai

    Rusty Macintosh SE/30

    The CRT was dead and killed the CRT board - specifically I believe the retrace blanking circuit - so I replaced a transistor as suggested in this thread, and now it works fine in that regard! Picture of the issue; it had a blown cap as well that prevented booting, but after replacing the cap I got this until I replaced the transistor: Pic of the solder area as I replaced the transistors, conveniently they were very easy to replace: Next I'll try getting the rust off the frame. I replaced the caps on the motherboard and so far it's working...
  10. it would matter for internal charging, right?
  11. Jinnai

    Rusty Macintosh SE/30

    I got a new PSU switch in today (https://www.ebay.com/itm/323539000187), as the original was incredibly rusty inside - unfortunately the PSU is still dead, my multimeter reads between 0.7 and 2 volts, though that is without a load. It didn't power up the Mac anyway. But the switch works and is a lovely fit.
  12. I try to mark the boards I recap, usually with a sticker, so later on people know it's been recapped. Say in 6 years, wouldn't want someone to think some machine had 35 year old caps if it didn't.
  13. I cannot remember if people were saying to wash in vinegar, or baking soda, for in case it is important to neutralize the alkaline of the leaky caps. Regardless... yes I also have had success with boards running better just from scrubbing them. As long as you let it try it's totally fine for them.
  14. Jinnai

    LC 575 pulled pad

    I would solder a little piece of 30 gauge wire from the cap terminal to the other end of that trace. It's not the end of the world, for sure, and it's much easier than trying to fix it correctly, in the short term and if you don't know how.
  15. Jinnai

    Rusty Macintosh SE/30

    Thanks for the offer Johnny! I actually had one laying around from a Plus that I think will work, if I can fix the CRT tube board. I will probably always be lacking the Superdrive, though I might have an 800k I could put in, if it's compatible. Thanks for the info on the bracket! I think it's a pretty cool bracket. Unfortunately I threw away the drive pretty quick, but I remember it was Seagate. It really was stored in a bad environment. I can't wait to test the motherboard and know whether or not it survived at all. I will definitely remove the metal frame and hit it with a wire brush. What's your favorite rust prevention coating? Does WD-40 work?
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