DEC RK07 drive interface specs wanted

I suspect this may depend on the era of field servoids you came across. I came across the ones at the end of the 80's, and the few I saw were pretty clueless. A somewhat counter-example. At one place I worked, the VAXen were on a service contract, but the older peripherals, like the VT100s, VT220s and LA36s were not. Anyway, we had an LA36 that was malfunctioning, blew its carriage motor fuse, etc. Anyway, I decided to repair this one morning, when coincidentally the failed servoid was around for some reason. I got out the prints -- the failed servoid was amazed that (a) I had them and (b) I could understnad them. Didn't take long to trace the real problem. A sheered key on the carriage motor pulley. This meant the motor didn't stop when the carriage hit the side frame, but carried on turning slowly. The motor had then overheated, the insulation had burnt off the windings, the currnet had gone even higher, and so on. Failed servoid was equally amazed that I could figure this out. OF course there was only one solution, to rewind the motor. Took it apart, drew a diagram of the connections to the commutator, unwould the old wire, wound on some new with a friend helping me. Then put it all back together. Worked fine for a few more years. That failed servoid was still trying to sort out whatever problem he had come for when I had that LA36 cased up and running. Sometime I will have to tell you of the story of ARD (aged 10) .vs. the TV rental company servoid. My parents have been regretting this ever since... -tony