68kMLA Classic Interface
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| Click here to select a new forum. | | Rewiring a mac classic analog board | Posted by: ironborn65 on 2020-11-12 16:07:20
Dear all,
I'm stuck trying to repair the Analog Board of my Mac Classic (I have two of the actually).
The issue with those boards is that the transformer and the CRT power section are in the same board.
I'm not an expert, but in theory wouldn't be possible to identify in the schematics where the -12 +12 +5 GNR goes to the CRT part of the board to add instead the wires from a new PS? The same wires could be sent to the logic board and keep the V/H SYNC, VIDOUT, audio, brightness.
I do not have the skills to face this project, but does this makes sent to some of you?
thanks
best
PF
| Posted by: Elfen on 2020-11-13 14:41:27
It would be easier to go with saying what symptoms your board(s) are having and deduce what parts you need.
The usual suspects are the flyback transformer and the components around it. Next are the cracked solder joints at those components and at the jacks where the CRT and Logic board plugs into. Then there are a few parts after that, like an Isolinear coupler in around the socket for the logic board.
Get a copy of Dead Mac Scrolls and Upgrade and Repair Secrets for the Mac Classic, both by Larry Pina. You can find them both online.
| Posted by: bibilit on 2020-11-14 23:38:46
Already done.
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