[cctalk] Re: Qume 842 8" Disk Drive Question

Michael, Thank you, that was what I was planning as my next step.  I haven't checked to see if the service manual has a full schematic. The main purpose of my message on here was to see if I was missing something obvious like an option trace cut or something like that that I missed when I checked the manual. Thanks again,          Mike On 1/31/2024 2:29 PM, Michael Thompson wrote: > Connect an oscilloscope to the output of the single-sided sensor and > see if it works. If so, trace the signal through the logic and see if > it gets to the I/O connector that goes to the greaseweazel. > > On Wed, Jan 31, 2024 at 2:38 PM Mike Katz via cctalk > <cctalk(a)classiccmp.org> wrote: > > I have recently acquired a Qume Model 842 double sided 8" disk drive. > > I have reset all of the settings to factory default and hooked it > up to > my greastweazle. > > The drive works perfectly for double sided disks (using the > appropriate > index hole). > > However, the greaseweasel reports no index pulse when I put a single > sided diskette in the drive.  I have attempted to clean out the > sensor > for single sided diskettes to on avail. > > Does any one have any ideas? > > The grease weasel works perfectly when I connect SA-800 drives. > > I have not yet tried installing terminating resistors in the Qume. > > Thank you in advance for your help, > >                        Mike > >