Latest in Scale Helicopters

New to SHP. Stumped & need some help. After 10 years I am jumping back into RC Heli's. I last left off with a fully operational TRex 600 and a large drone. I purchased a Roban 700 AH-64 and have the mechanics ready & electronics installed. System - Spektrum ix14 trans & AR8000 Rec'vr, I bought the Motion RC recommended electronics, Castle 160 ESC @ BEC, 3 MKS DS1220 Servo's, 1 MKS HBL 980 and 2 Admiral 5000 mAh batteries. I hook up the esc and the motor operates as programmed. However, the servo's will not function at all. I programmed the Castle ESC to 6.6V & tried 7.6 volts, still nothing moves or makes a sound. I have tried an AR14400 Rec'vr as well with no different results.

Would appreciate some advice on how to get the servo's functioning.

Thanks A

Need help. Have a 900 size Vario R22. It flys great but am having a problem. Burning up tail rotor servos. On the third one now and at this point it wont last long. After a 7 minute flight the servo is hot enough you can blister your finger (if you could hold it on it long enough) . Shorten the flight time to 5 minutes not much difference, still hot. The cyclic servos are just fine. What we have done so far in trying to fix the problem. Linkage operates freely. Checked the voltage coming out of the FBL ( same as the cyclic ones) it is within specs. Servo is a HV up to 8.4v. Double checked the programing in FBL. it is set at 760 pulse and 500 frequency.( servo specs are 760 pulse and 560 freguency but Axon Fbl only goes to 500) Have run out of what to check or do next. I know I can't keep replacing servo at 2 or 3 flights,