Thread
Macintosh LC III: System error on fresh startup disk.
I just wrote a System 7.5 NAD floppy to complete the OS 8 on LC III hack, anjd was gretted with "Sorry, a system error occurred. bus error to temoporarly turn off" blah blah blah... error. any clues what bus is getting an error?
As I've said in another thread here recently, I used to get this a lot with an LC 575...washing the motherboard took care of the problem. It could be cap related, or any number of things. I have no way of knowing whether washing the logic board solved the problem, but a little anecdotal advice can never hurt. 
You fixed a bus error by washing the mobo? how would I go about washing the mobo? 
Just try a different boot disk (i.e SuperBooter 7.5)
the 7.5 nad worked fine before. the problem is NONE of my bootdisks are working: an old 7.5nad (system error) the new one (bus error) the 7.6 disk tools disk (happy mac, then back to blinking ? mark.
i'll try removing the ethernet card and ram.
i'll try removing the ethernet card and ram.
...and no luck. I'll try the superbooter.
...and I can't find a working link. anyone wanna volunteer a DC42 or RAW floppy of it?
or just use the LC III System 7.1 disk tools disk (which is on the Legacy CD)
if it doesn't work, I'll PM/email you a SuperBooter image.
if it doesn't work, I'll PM/email you a SuperBooter image.
*looks through Legacy CD*
OK, before I try another boot disk, should I just wash the mobo? the 7.5NAD worked fine before, and now none of my boot disks work.
Interesting, years ago when I did a lot of hardware, one would track down problems with voltmeters, continuity testers, oscilloscopes and logic analysers. Now people seriously suggest putting things in the dish washer. If only all sins could be so easily washed away.
Nothing's wrong with making a fresh (different) boot disk with a new floppy just to make sure.
how do I go about taking out the mobo and washing it?
You know it's very possible that the disk just got corrupted, especially if it wasn't new.
If you don't hear a whistling sound from the speaker or unusually weak sound, then it's not your caps.
If you don't hear a whistling sound from the speaker or unusually weak sound, then it's not your caps.
it was a brand new disk
how do i get out the mobo and wash it?
how do i get out the mobo and wash it?
1. Open the case.
2. detach cables
3. unclip plastic clips
4. put in dishwasher
Apparently.
Note, washing a motherboard is not the same as re-capping.
Before you begin, remove
the following:
•Top cover
•Fan
Review the ESD
precautions in Bulletins/
Safety.
Logic Board
Take Apart Logic Board - 19
1 Disconnect the following
cable connectors from
the logic board:
•Hard drive power
cable
•Hard drive data cable
•Floppy drive cable
•Power supply cable
•Fan cable (LC II/III/
LC 475 and Quadra
605)
•Speaker cable (LC II/
III/LC 475 and
Quadra 605)
2 Remove the expansion
card (if installed).
Caution:
In the next step,
be sure the power on/off
button clears the rear panel
before you remove the logic
board. While lifting the
board, do not touch any
components or connectors on
the back of the logic board.
(The oil from your skin can
harm the connectors.)
Take Apart Logic Board - 21
3 Using your forefingers,
spread the two latches
that secure the logic
board to the bottom case.
At the same time, using
your right thumb, push
on the expansion
connector and slide the
logic board toward the
front of the case.
Take out the logic board and wash in cold-slightly warm water with a little soap in a dishwasher or bathtub.
This may seem simple but is everything connected properly to the logic board (HD cable, RAM, etc)? Have you tried a different stick of RAM?
The LC III has logicboard RAM. i removed my 32MB of extra ram and the ethernet card, but no luck
im gonna try a 7.1 disk tools disk.
im gonna try a 7.1 disk tools disk.