warmech
Well-known member
Howdy everyone!
I'm looking at a Mac IIx that I've cleaned, recapped, and replaced the batteries on; there appeared to be damage to one trace between a couple of pins on UB2 that I bodged, and that looks like all the visible problems I could find. When powered on, the screen comes up white (like it's about to load the cursor) and the initial boot chime occurs but, a few seconds later, a *da-DA* chime is produced, followed by a fast chime of death. I've never run into this kind of double-chime before, and am a bit thrown by what that means. I've been unable to find anything in my research that indicates a set of chimes like that, so I'm scratching my head at the moment. I don't have a lot of experience with Mac II's, so I'm hoping someone here might have some insight. Attached is an audio recording of the chimes in action.
Also, I'm a bit confused by something else; performing a continuity test at the PSU connector shows the +5v rail tied to GND, but the machine powers on. What the heck is up with that? Wouldn't that just cause a short and keep the machine from powering on to begin with?
View attachment chimes.m4a
I'm looking at a Mac IIx that I've cleaned, recapped, and replaced the batteries on; there appeared to be damage to one trace between a couple of pins on UB2 that I bodged, and that looks like all the visible problems I could find. When powered on, the screen comes up white (like it's about to load the cursor) and the initial boot chime occurs but, a few seconds later, a *da-DA* chime is produced, followed by a fast chime of death. I've never run into this kind of double-chime before, and am a bit thrown by what that means. I've been unable to find anything in my research that indicates a set of chimes like that, so I'm scratching my head at the moment. I don't have a lot of experience with Mac II's, so I'm hoping someone here might have some insight. Attached is an audio recording of the chimes in action.
Also, I'm a bit confused by something else; performing a continuity test at the PSU connector shows the +5v rail tied to GND, but the machine powers on. What the heck is up with that? Wouldn't that just cause a short and keep the machine from powering on to begin with?
View attachment chimes.m4a