YE-DATA YD274 manual/schematic anyone ?

[zippysticks]

I could really use a manual for these full height 5 1/4 drives please.

I have them in my Research Machines 380Z but understand they may have been used in the IBM 5150 too.

Thanks

 

[zippysticks]

Found one http://archive.retro.co.za/archive/computers/YD-274-Schematic.pdf

 

[zippysticks]

Found one http://archive.retro.co.za/archive/computers/YD-274-Schematic.pdf

http://archive.retro.co.za/archive/computers/YD-274-Schematic.pdf

Not convinced that this schematic if correct for the YD-274 as the filename might suggest. It also does not seem to indicate how the motor enable signal gets through to the spindle motor itself. I have two of these drives that both seem to have failed in the same way - the motor does not spin despite the motor enable signal being provided.