FD400 drive troubleshooting

23 Nov 2007

...
   Many/most drives have 50Hz/60Hz zebra discs on the
flywheel, for using a
flickering fluorescent light. 
 Which just happens to be the ratio of 300RPM vs 360RPM, so that on a 300RPM
 strobe disk w/a 60Hz light the 60Hz bars = 300RPM and the 50Hz bars = 360RPM.

 FWIW,  
 Hi
  I think you have the ratio backward. The 60 Hz disk for 360 RPM
 can be used for the 50 Hz 300 RPM. 

I think you're both saying the same thing. Assuming you're in the States 
and have a 60Hz light source available, then take the standard '300 rpm 
50/60Hz' strobe disk found on, say, the TM100. The '60Hz bars' will let 
you check a 300rpm spindle (obviosuly), the '50Hz bars' _used with a 
60-Hz lamp_ will check a 360rpm spindle.

-tony

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FD400 drive troubleshooting