68kMLA Classic Interface

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Macintosh ED DOVE enhanced
Posted by: Trash80toHP_Mini on 2017-08-25 10:21:03 But did she throw anything at you? [🙂] ]'> Done! Board Cleaning - Techniques - Chemical Reactions
Posted by: mactjaap on 2017-08-25 10:33:28 Hahahaha no, but she is now filling it with dish wash. This can't be a coincidence! I think she will keep it occupied just to be sure.
Posted by: bibilit on 2017-08-25 23:25:50 This sound can be the result of a bad optocoupler in the Analog board, if you have another board, try moving the optocoupler to see if the problem remains.
Posted by: mactjaap on 2017-08-26 04:10:19 What is the optocoupler?
Posted by: bibilit on 2017-08-26 09:52:29 small component in the bottom left of the AB: https://68kmla.org/forums/index.php?/topic/28998-macintosh-plus-another-analog-board-issue/
Posted by: Trash80toHP_Mini on 2017-08-27 09:00:06 Hahahaha no, but she is now filling it with dish wash. This can't be a coincidence! I think she will keep it occupied just to be sure. LOL! Gotta hand it to her, that'll keep you in line! Came up with a notion for a better dishwasher kinda deal, Need to have a compressor though. You can always justify buying a small one for inflating tires and blowing the dust off and out the door of whatever's on the shelves in a garage or or take anything in the house that's nasty with it outside for a dustoff. For a plain water bath you don't even need the vinegar containment unit, just a cheap paint spray gun. https://68kmla.org/forums/index.php?/topic/31095-board-cleaning-techniques-chemical-reactions/&do=findComment&comment=338784
Posted by: mactjaap on 2018-04-22 14:08:43 The ED is working again. A fellow Mac Liberator fixed the analog board. What is done: - J1, J2 and J3 with fresh solder. - R55 not 33Kohm but 45K ...so replaced - Q11 (2N3906) broken... replaced - CR15 en CR17 (6V2) broken...replaced Board started with these fixes, but currents are to low. 4,3 instead of 5V and 10,5 instead 12V, Not manageble by R59. It was U3 (opto). This was broken. Replaced. The board is now working fine!!!
Posted by: mactjaap on 2018-04-22 14:13:03 Here is the Ed back to live. I had a donor MacSnap board with good RAM. It now works fine. Only have to fight the rust on the frame!
Posted by: MOS8_030 on 2018-04-22 15:16:48 Nice! That one was in pretty rough shape.
Posted by: olePigeon on 2018-04-23 08:52:10 What is the optocoupler? Well, you see, when two octopuses love each other ...
Posted by: mactjaap on 2018-04-27 09:55:20 Will have some work on the rust!
Posted by: mactjaap on 2018-05-11 09:17:52 The ED is now fully restored! Working analog board, working motherboard and working MacSnap SCSI and memory expantion. Also I have been fighting the rust with a cheap multitool (at the Action a FREM ... 15,-) , vinigair and WD40. See the pictures here: Chassis soaked in acid. Used old blankets to keep wet. Used a Dremel /Multitool to remove the rest of the dust. Fine tuned with steel wool and WD40 Back in business!
Posted by: Brett B. on 2018-05-11 09:51:45 Good work! That was totally worth the effort to fix, those are neat machines. FWIW I might have tried an electrolysis tank to remove the rust. Basically what it involves is a solution of water and washing soda and a DC power supply. You hook up one end of the power supply (negative) to the item that needs to be de-rusted, and the other (positive) to a consumable iron rod that is facing, but not touching, the rust spot. Both are submerged in the liquid solution. When power is turned on, the rust is slowly removed by a chemical reaction. Hooking the power supply up the other way actually creates rust on the object in question - also kind of a cool trick if you want something to look old. I've done this to a couple of antique rifles and some old tools that were in bad shape. The results are amazing. It does produce hydrogen gas and some fumes so it should be done outdoors.
Posted by: mactjaap on 2018-05-11 10:01:34 Cool trick! I directly watched a YouTube movie to understand it:
Posted by: olePigeon on 2018-05-11 10:32:08 You should spray the chassis and HDD mount with some Krylon black rust protector. It'd look great. 🙂
Posted by: olePigeon on 2018-05-11 10:33:07 Also, I love that Dove badge. I like that it's actually a molded & painted badge and not just a sticker.
Posted by: mactjaap on 2018-05-11 12:30:24 Yes. The badge! That a detail I also love very much about this one. I don’t know why it was on. I have three ED. Only one has such a badge.
Posted by: Charadis on 2018-05-17 19:38:16 I thought I had posted on this thread before, but I guess not! I don't usually comment on compact Macs as I don't know too much about them, but that is some great work, and I definitely love seeing when someone with as much passion turn something from as bad and nonworking condition into a fully functional example. I see more beauty in the work than the machine itself.
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