It's been so long since I did the calibration that i dont remember specifics, I do remember it got things back on center with the radio after i did it a few times. The sticks have tolerances they move +/- in the range over, especially if your a stick slammer or the TX is old and pots are worn. My issue was on a TX that was 2 years old and the pots had worn, after i recalibrated i sold the TX and used the new v 2.3 firmware one that came with the V450. Didnt have to mess with this one.
I have my V450 completely apart on the bench going to take some pics and maybe do a little tutorial or something because the expanded diagram does not cover 100% all the parts that have to come off. The pulley gear right after the boom aka the tail belt pulley which is basically in the center of the split frame (a PITA), in order to replace it its about a 70% teardown to get to the part, without it being a knuckle buster and chance cracking the frame.
This is the second rear pulley that went wobbly on me causing a tail wag and in doing that repair i found out on the main bearing block, the bearings have all but seized up on the main shaft. The main shaft was just spinning with no help from the bearings, and i noticed a lot more friction in the head spining up by hand recently. Maybe it was the Gov mode that finally did them in...... 18 bucks for a new set of bearing blocks and about 15 for the pulley and top bottom steering bearing blocks. Probably about 2 hrs labor to do it right
While i had the heli torn down i wanted to see what 3G mems gyros the 2702V uses, turns out they are just consumer grade Invensense IDG650 for the X & Y (Aile/Elev) and ISZ650 for the Z axis (tail). Nothing special really for as decent as it holds.
For those who like the technical stuff, here are the specs from the manufacturer on these chips;
IDG650 - http://invensense.com/mems/gyro/idg650.html
ISZ650 - http://invensense.com/mems/gyro/isz650.html
Same 3 axis mems chips used in the MCP-X and many other walkera 3G micros.
PS. Checking the power bus on the 2702V, it looks strong enough to handle high amp servos. Thos big globs of solder carry current down each side on the end + & - as the main power buss. They did a good job with the solder and the traces are thick for anyone who wants to run standard servos concerned about external power busses.