Hi Pete, yes it is and it does save a lot of grief and ruined fets. From memory
the procedure i used was to unplug the ribbon cable from the fet/heatsink board and then cut wires 9&10 and 1&2. Connect negative 12/24/48 (your flavor) to wire 9 or 10 leading to control board and then connect positive to 1 or 2.
this allows you to power up the control board without energizing or connecting to the power board. If you can do the same thing without cutting the wires, go for it. You just need to get ribbon disconnected from power board and get power and ground to control board. Next put scope probe on each pin 3/4/7/8 (i think these are the 4 H bridge drive wires. Of course ground pin on scope goes to negative on pin 9 or 10. You will also need to plug in the long flat connector so you can switch it on/off. Since it wont be generating a sine wave for feedback it will fault within a few seconds of each power on cycle but immediately after each power on cycle you should see a decent square wave, it wont be a continuous duty cycle so it looks strange but the basic thing to look for is that the voltage goes high enough, the transitions look fairly square and all 4 are very similar. Usually all 4 do not have same problem so just comparing the 4 will get you there. Frequency is gonna be somewhere north of 20khz range i think. Its been a few years now so i'll see if i can post a photo and better info this eve. Good luck. One other cool solution is just to buy a driver daughter board for $25 and replace it. They still have those, i think the new version still uses the same board.
have fun!
(CAUTION pin numbers were edited if you read this earlier today, power and ground pins were reversed)
i had a couple wrong. If you want to get picky, the probe neg is different for the high side drivers, each has its own negative pin 6-and4+ are a pair, 5-and7+ also a pair. 9/10 are - for pins 8 and 3 which are the two bolted to the heatsinks with the AC connections. I dont think i fussed about the correct ground though. If you just use the 9/10 ground for probing all 4, two will be inverted and look a bit wierd but there will still be two symmetrical pairs that look alike if all is well.
LH