srvo 65 and 62srvo

Hello Everyone,
OK here is the problem i have A r2000 fanus with a rj3ib controller im getting battery alarms on axis 4,5,6 and losing counts on 4,5,6 .While axis 1,2,3 are find I have replaced batteries twice in last 3 weeks I put a new set in 3 weeks ago and everything was fine made short run with robot like 3 days setting up new part went back to robot monday of this week to address a analog output problem turned power off to change rack
then when powered up there it is srvo 62 not my first rodeo so i reset it and remaster everything fine have to power down again for 5 min when i power back up there it is srvo 62 so i remaster everything good again . Nope and hour later I get srvo 65 battery low by this time I'm done with it.That was Monday. So today i go back to it found out what my analog Problem was thats another story I power off to change card what like 45 seconds turn back on and once again lost counts on 4,5, and 6 1,2,3 fine So i change Batteries again this morning 8-22-14 and remaster and now i got the srvo 65 alarm.
So i guess my question is why 4,5,6 and not 1,2,3 have any of you seen this before i haven't any help will much appreciated
Thanks

the first place i would look is the RP1 Cable. it should terminate inside your controller on the servo amplifier as a 50 pin connector labeled CRF7. power up your controller and check to see if there is 5v going to each axis. they are paired as such.

J1 13: 5v -> 43 0v
J2 14: 5v -> 44 0v
J1 15: 5v -> 45 0v
J1 16: 5v -> 46 0v
J1 17: 5v -> 47 0v
J1 18: 5v -> 48 0v

this will tell you if your amplifier is producing the voltage you need for those joints. you can check the other side of the cable to see if the batteries produce voltage across those pins. if either of them are dead, then you have isolated which side the problem is on.

i suspect that it is one of the following items.

servo amp is bad
rp1 cable is bad
robot internal cable assembly (inside the robot arm)

good luck.