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I recently discovered that my lack of boot chime on my Mac II was due to a bad speaker. I looked for some cheap 32 ohm speakers with a 56mm diameter, but the closest I found were these 40mm versions:
uxcell 0.5 W 32 Ohm DIY Magnetic Speaker 40mm Round-Shape Replacement Loudspeaker for DVD/EVD...
I just finished swapping the orginal PSU fan for a Noctua (80mm, 12V DC, ULN) on my original and non-upgraded Macintosh II. When I did a smoke test the computer was dead as a dodo.
The batteries read 2.48V (upper) and 0.87V (lower). I bought this computer from a friend and it was recapped last...