I'm new to the forum; thanks for having me.
I'm a big fan of the CC and I use a CC I bought at a store myself in 1993. I turn it on everyday and use Word for text processing (I write SF). I've been playing and fixing macs for over 20 years but this is a hard nut to crack.
A few days ago I turned the CC on but it wouldn't boot. It gave me the disk with the question mark. Disk gone? Just like that? Strange, I thought. Booting up from an external device (ZIP drive or the MO disk worked fine, as well as with the floppy disk). The disk is an IBM OEM made for Apple model WDS-L80, 80 MB. Norton Disk Doctor could not examine the disk, nor HD Setup, nor HDT tool. No tool could work on the disk.
SCSI ID is zero, so SCSI probe or SCSITOOL found the disk and gave a correct description. But that was as far as they could go. I even tried a mkfs tool from NETBSD which returned a SCSI error #5, the same one returned by NDD.
I formatted an identical drive (I have a spare one), connected it to an external case and it mounted on the desktop (as far as I can tell the external devices have been working fine). I installed the good disk in the CC and to my surprise (it is not configured to SCSI 0 though, it had ID4) it behaved exactly as the other one, SCSI error #5! SCSI Probe show ID4, but no tool can work on the disk.
1. The SCSI controller is one for the entire chain. Could it be bad only for the internal HDD?
2. Does the SCSI ID of the internal HDD HAVE to be zero? Right now it is 4.
3. The cable could be bad? Hard to think how it became bad from one day to the next. It is an internal cable. As I described above, nothing changed from one day to the next.
Some extra info:
I have checked and changed all the capacitors on the logic board after the problem started. The problem persisted.
The terminator is ON in the last device of the SCSI chain: the ZIP drive. CC(ID7) -- HDD(ID4) -- MO(ID3) -- CD300(ID5) -- ZIP(ID6)Terminated. The problem is the same with the external chain connected or not.
The specs for the disk can be found at http://www.bk0010.narod.ru/DRIVESPECS/IBM/1734.txt although it is not completely accurate. I think the Apple OEM model is slightly different. The SCSI Jumpers Information is right-to-left inverted. PIN 1 is the first one on the right, not on the left as it is shown at the link.
I have another CC logic board at my parent's I could swap and see if it works, but it is a loooooong drive.
I'm trying to find if anybody has seen something similiar before and could give more ideas.
Any help is greatly appreciated.
Long live the Colour Classic!!