• Hello MLAers! We've re-enabled auto-approval for accounts. If you are still waiting on account approval, please check this thread for more information.

Macintosh IIcx - CD Boot/Chime Issues?

So I'm going to preface this by saying I've got caps ordered, but not yet done. They certainly have leaked, I've cleaned the areas around them as best I can to prevent further damage, but replace the actual caps until the new ones arrive.  I suspect that the caps could be causing the no chime issue, as I've read the caps can affect the audio system. Is this correct?

The floppy drive in this machine isn't functional, so I'm attempting to CD boot it. I've got a OS 7.1 CD, and a known good external SCSI CD-Rom. I can boot my IIfx from this CD drive. Holding 'C' doesn't seem to work, I suspect that's a later feature not present in this ROM. To begin with, it didn't work at all. Later I had the idea to do a PRAM reset, and now it actually tries to boot the CD every startup, which is great. 

By tries, however, I mean it activates the drive for a moment, then goes to the happy mac icon. Then after a few more drive flicks, it just goes right back to the floppy question mark icon. No reset, no error, just happy mac -> question mark.

Any ideas why that would happen? Power supply lines read good with a multimeter, and while the caps aren't done, I'd assume if I can soft-power on, and get this far, the caps aren't likely cause it to not boot like this, are they? Any other ideas what might be affecting it?

 
Honestly this sounds like a cap problem. My IIcx was flaky and continued to get worse up to non functional status until I replaced caps. First major circuit to go is sound usually.

I know the IIcx can boot from SCSI ZIP ok without any key combo

 
Back
Top