KGLlewellyn
Well-known member
Hello there,
I recently picked up a battery damaged Macintosh IIfx and I'm experiencing some strange behavior with it. Here's basically a summation of where things are at:
Current Situation:
Not sure if anyone here has experienced such behavior with a IIfx, or known the axial's/tants to fail?
I recently picked up a battery damaged Macintosh IIfx and I'm experiencing some strange behavior with it. Here's basically a summation of where things are at:
Current Situation:
- Will not recognize any SCSI devices except for a BlueSCSI.
- IIfx will consistently sound the death chimes if the IIfx ROM is installed, but not the ROMinator.
- When the ROMinator is installed the IIfx will only boot to the ‘?’ floppy if it has not been powered up in the last two minutes.
- If the IIfx has been powered up again within the last two minutes or is rebooted, it will either chime to a black screen, or sound the death chimes again with a black screen.
- It can only be booted from the ROM disk in the ROMinator. When this is done it appears to operate normally with no crashes, or other system instability.
- The IIfx can also mount BlueSCSI drives and browse files and run applications normally when it is booted up from the ROM disk.
- It will attempt to boot from the BlueSCSI but it will consistently bomb out with a ‘Bus error’ or the ‘Welcome to Macintosh’ splash will repeatedly flash over and over.
- Soft power is working, however the power button will not power down the IIfx. If shutting down within the Mac OS, the IIfx powers off normally.
- NMI Switch works
- Sound works.
- ADB works.
- PRAM works and settings preserved after power has been disconnected.
- 128MB RAM installed, all recognized correctly by the machine.
- Serial is untested
- Reset switch not working
- All SCSI drives don’t work except for a BlueSCSI. Cannot boot from BlueSCSI.
- SCSIProbe reports ‘Bus not terminated’ unless the BlueSCSI is installed. Even if the SCSI filter block is used.
- RAM chip (UD16 M5M5256BFP-10L) supporting the Serial ASIC (UC16 Apple 344S1021-B) is damaged. However, this should not be impacting the SCSI bus based on schematics that I've gone through.
- I don’t have a black SCSI terminator, however external SCSI devices aren’t being used.
- Replaced all SMD electrolytics (only two present), rest are tantalums.
- Used Deoxit to clean up all dulled contacts on ASICs, RAM contacts, resistors, SCSI connectors etc.
- Restored three broken PCB traces need the right hand battery.
- Removed damaged batteries and holders, installed new holders and batteries.
- Used baking soda to neutralize and remove all battery acid.
Not sure if anyone here has experienced such behavior with a IIfx, or known the axial's/tants to fail?