TheReducer
New member
I bought a Mac Classic II (rev b) locally for $30 - nonworking. It started up to black/white vertical bars.
I found the ROMs were not positioned properly, and after positioning them correctly, the black/white bars went away. The system then started up to a blank gray screen with cursor that I could move with the mouse. But, no bong startup sound and no disk activity.
I completed thoroughly cleaning and recapping both the analog board and logic board.
After this work, the startup behavior is exactly as before. Disconnecting the SCSI hard drive does not change the behavior - I'm still not prompted for a floppy boot disk when starting up - just a blank gray screen with mouse cursor that I can move with the mouse.
Video of startup:
https://drive.google.com/file/d/1JzVAwHMhhhDi2UlU3v5IjZ_FbMA1qToe/view?usp=sharing
I'd appreciate any advice on what to do next.
What I'm considering:
* Remove U8 (the SCSI chip), clean and check all traces before re-soldering.
* Test the speaker with ohmmeter (should measure 60 ohms)
https://68kmla.org/bb/index.php?threads/macintosh-classic-ii-with-no-sound-analog-board-issue.37732/
* Remove U4 (DFAC - sound chip), clean and check all traces before re-soldering.
Thanks for any advice!
I found the ROMs were not positioned properly, and after positioning them correctly, the black/white bars went away. The system then started up to a blank gray screen with cursor that I could move with the mouse. But, no bong startup sound and no disk activity.
I completed thoroughly cleaning and recapping both the analog board and logic board.
After this work, the startup behavior is exactly as before. Disconnecting the SCSI hard drive does not change the behavior - I'm still not prompted for a floppy boot disk when starting up - just a blank gray screen with mouse cursor that I can move with the mouse.
Video of startup:
https://drive.google.com/file/d/1JzVAwHMhhhDi2UlU3v5IjZ_FbMA1qToe/view?usp=sharing
I'd appreciate any advice on what to do next.
What I'm considering:
* Remove U8 (the SCSI chip), clean and check all traces before re-soldering.
* Test the speaker with ohmmeter (should measure 60 ohms)
https://68kmla.org/bb/index.php?threads/macintosh-classic-ii-with-no-sound-analog-board-issue.37732/
* Remove U4 (DFAC - sound chip), clean and check all traces before re-soldering.
Thanks for any advice!
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