The original MP-F-51W bitmapped schematic can be downloaded here.
All related schematics are downloadable here.
Eugene Gillott from Canada created the vector version and gave me (JDW) permission to make it available to the public. Eugene said that he found some minor differences between the actual drive and the bitmapped original schematic. Apparently, there are some additional components involved with the CSTIN pin that connect to PIN20 of CN1 that do not appear on the original schematic. In addition, the original drawing shows the CSTIN pin as active low but when Eugene measured it with a floppy inserted, it showed +5V. He thinks that the floppy drive he has is not properly represented by the original schematic. In other words, there could be board revisions or variations not perfectly shown on the original bitmapped schematics.
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