From: dm561 at torfree.net> > Date: Thu, 22 Nov 2007 07:58:17 -0500> From: "Richard A. Cini" <rcini at optonline.net>> Subject: Re: FD400 drive troubleshooting> > >The way that the service manual tells you to check the speed is the pulse> >width on a specific test point on the PCB. I was just going to use a laser> >tach on the spindle...but I have to get a tach first :-)> -----> Strobe disk?