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fatlobster

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Everything posted by fatlobster

  1. Yesterday I manage to remove and solder back the U7 and U8 chips, when I tried to power on it doesn't boot at all. Today I tried to power it again with success, with the similar probability of success boot before recapping. It's easier to boot if I cold boot the system not so long after I shut it down. I noticed that the sound chip still get hot even if it has succeeded to boot. And I've also seen a pattern when the system successfully boot (the screen will appear jagged). Things I suspect: 1) It has something to do with the bad caps on the AB. But I'm not sure which cap that
  2. Thank you bibilit for your explanations, I think it make sense that capacitors can be found in different sizes with same value. I'm assuming that the Egret chip is indicated as U7, isn't it? I'll try to clean it thoroughly with IPA. For the ROM chips, yes I took it off for cleaning purposes. I took picture before removal to make sure the correct position. I've discovered that uniserver had this hot sound chip issue back in 2014, but the thread does not seem to be resolved.
  3. Upon rechecking the rear part of the analog board, I noticed something unusual but not sure if it's a cold solder because I never experience one. Should I reflux this part?
  4. I recently recapped the AB (Analog Board) & LB (logic Board) of a Macintosh Color Classic (CC). The board is visually in good condition, lucky that the battery did not leak. All the photographs are in the quote below, click to zoom the photograph. The recap guide based on Bruce: LB: https://recapamac.com.au/macintosh-colour-classic/ AB: https://recapamac.com.au/macintosh-cc-analog/ The AB was partially recapped as of recommendation from Bruce. Only that I did not replace the two of 5600uf 10V capacitors due to unavailability in my local ma
  5. Exactly a good idea! Thanks for your advise!
  6. This might be a silly question... I just realised that my Macintosh SE unable to read my Floppy Emu if the disk size is 1440k. I was thinking earlier to swap the floppy drive from my Classic to SE. But realising that Floppy Emu not even able to emulate 1440k on the SE, I'm thinking to reconsider it. Is there anything I can do (software/hardware mod) to enable the SE to read 1440k disk – except swapping logic board from SE/30 or FDHD? Above is 1440k disk readable in Classic – Below, the 1440k disk not readable in SE
  7. The previous re-cleaning job is not enough, the simasimac has reappeared. I decided to do another re-cleaning job to the board thoroughly as everyone have suggests, this time with distilled water+IPA. I noticed that there are a lot of white residues (I assume it's aluminum) that can't be seen with naked eyes until it dries. I guess these are the root of the problems. One thing that I noticed when I tried powering on again with cold boot in the second I turn it off: simasimac appeared briefly. I assume that the CRT still have the power to immediately show the simasimac dur
  8. I really thank you to everyone, I'm feeling grateful to have this community ever existed. I have attached a photograph after re-cleaning it with IPA. It works good so far (boot with no delay, previously the delay is slightly noticeable) – but I'm not sure in the next morning it will boot up as normal. Will keep everyone posted. I think further cleaning will do the work. The reset button works when it boots, but in this case it does nothing. Hmm sound chip, that's what I never thought of before (as I thought a sound is just a sound) – I will check on that.
  9. I recently recapped the logic board of Macintosh Classic (the simasimac has appeared before recapping, but has gone better). I have to turn on and off several times until it boots up (most of the times it's easier to boot the machine after it has been turned on for so long). All the voltage appeared to be normal. Most of the similar case that I've found happened in Macintosh SE/30, and I'm not sure if the troubleshooting I've read here is valid for Macintosh Classic https://jeromevernet.pagesperso-orange.fr/SE 30/Repair Mac.html#Books. This is the only similar problem with the same model
  10. I removed the bumper without replacing it with anything, so far it works fine. Should I be worried without any bumper installed?
  11. You are perfectly right, it wouldn't be as that simple as I thought. It's challenging to find affordable LocalTalk bridge, as it would cost more than the Macintosh itself. Maybe I'll just wait until someone create something like Floppy Emu but LocalTalk bridge version.
  12. I'm really new to vintage Macintosh, and I'm wondering if I could get it work with these scheme as attached. I really have no idea about connecting the cables, and couldn't find anything on the web related to Macintosh Classic network peripherals with macippi. My plan of setup as following: - Macintosh Classic - Apple LocalTalk RJ-11 Connector DIN-8 - Ethernet to RJ11 adapter - Ethernet to ethernet cable - Orange Pi One with USB WiFi Adapter - Wireless Router
  13. Hi everyone, I have the exact same problem on my Macintosh Classic. In my case, I changed the 2N3904 transistor and it runs back as normal – I wasn't sure at first though. Unfortunately after few hours of usage, now another problem has occurred – it shows straight thicker horizontal lines. Sometimes the machine boots, most of the times it won't (no bong). I tested the voltage on the SCSI, it shows as suggested (12V & 5V). I tried adjusting the voltage in the A/B but no luck. I guess it needs a recap job on the A/B and logicboard. Btw I got this from eBay, but the CRT damaged du
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