Macintosh ED DOVE enhanced
- Thread starter mactjaap
- Start date
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small component in the bottom left of the AB:
https://68kmla.org/forums/index.php?/topic/28998-macintosh-plus-another-analog-board-issue/
https://68kmla.org/forums/index.php?/topic/28998-macintosh-plus-another-analog-board-issue/
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
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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!!!
- 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!!!
Last edited by a moderator:
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!
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!
Last edited by a moderator:
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.
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.
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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