On Jul 18, 10:23 am, ayohoff <[email protected]> wrote:
> turning it back on, but got
> the same hissing and no monitor response.
Definitely something to do with the flyback. The flyback is one of the
easier parts to replace and quite easy to pick up on online or at an
electronics store for very little.
Open her up and also check the transistor at Q3, if this has failed as
well, it will fry your new flyback. So probably best to replace it
while you are at it. The BU406D can be found online or at any
electronics parts store. As long as you're in there, replace the CR1
and CR21 capacitors. This will be the minimum to keep the 128K running
smoothly for some time to come.
I'm not a big supporter of cannibalizing working Macs, but I often
think the Mac Plus was created to be an organ donor for the 128K &
512K. Because they were so popular and mass produced for so many years
worldwide and use an essentially identical analogue board, there is a
seemingly endless supply of cheap units available (also guaranteeing
their survival). You could simply swap out the working analogue board
from one and repair your old 128K board at your leisure. I always
advocate owning a Mac Plus because it makes a good intermediary
machine between the 128K & modern Macs, thanks to its SCSI port.
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