Philips P800 family minis

Hi everyone, I won an eBay auction for three Philips P800 family minis with three cartridge disc drives, disc cartridges, lots of spare parts, and manuals including schematics. All for the incredible sum of 10 euros 75. I saw the auction when it had 11 minutes left to go while I was on vacation (I'm a bit of an eBay junkie, although deals like this are becoming rare). I'm collecting the systems this Sunday afternoon. As the manuals are all in binders, I'm planning on feeding them all through a scanner and posting them to bitsavers. Now, I seem to recall that Tony Duell has some experience with these systems. Is there anything I should be aware of before loading them on a trailer? Do the disc drive heads need to be locked in some way? When I've picked up the stuff, I'll post model and part numbers. Any advice offered on how to get them going again would be very welcome. Cheers, Camiel.