On previous PCI-based Power Macintosh computers, there was an issue affecting SCSI ID 5, which may cause the computer to lock-up or the light on the SCSI 5 device to remain on constantly. The symptoms were most apparent when using array software, a scanner (when scanning), or a CD-ROM drive (without a CD-ROM disc inserted).
The issue was fixed in the SCSI Manager and was included in System 7.5.3. Newer PCI-based Power Macintosh computers which ship with System 7.5.3 should not have this problem, and previous PCI-based Power Macintosh computers can upgrade to System 7.5.3 by installing System 7.5 Update 2.0, which is available on the online services.
These articles can help you locate the software update mentioned here:
Ñ "Where To Find Apple Software Updates" - Lists online services for free Apple software updates.
Ñ "Obtaining Apple Product Support in the USA" - Lists 800 numbers and online services for software updates, Apple support information, and a subset of the Apple Tech Info Library.
Article Change History:
18 Apr 1996 - Updated technical information.