I've had 4 servos go bad while using this receiver, (2) JR9100 Digital Servos and (2) Hitec 7940Th Digital HV Servos. All were on the throttle side (channel 2). Each would work fine for a few weeks months until the problems started. The JR servos both reacted in the same manner by locking in a throttle open position as if the failsafe was cutting on but in the wrong direction! I checked the failsafe and even turned it off but nothing would fix it. I replaced the servo with another JR and it worked fine for a month or so and then failed/in the same manner. I then replaced it with a Hitec HV servo using a Lipo batt. and everything was working again until another anomoly...This time the servo acted as if it had no power. Every time I started the engine, the servo would cut out. I assumed the servo was bad so I replaced it again with another Hitec. It worked fine for a while (1-1.5 months) until it too failed the same way! I've called Futaba customer support, but the gentlemen on the phone was less than professional and suggested I buy Futaba servos. I've talked with several other racers at my local track who have all had the same problem and resorted to another brand of Radio. I was really hoping I someone could shed some light on this as I really love my 4PKS and the ability to run an unregulated Lipo with my gear. PLEASE HELP!

We'd have no idea why your servos are failing. It's not likely to be the receiver, though. The receiver can handle the voltage quite well...it has its own regulator for its internal circuitry. We'd look to the abilty of your servos to handle the unregulated LiPo voltage. That's the most likely source. Even trying Futaba servos may result in the same thing, unless you're using the HV (High Voltage) servos that are just starting to come out. There is no way the receiver can cause damage to your servos.

You'll need to check with the makers of the servos to see what the difficulty may be. Perhaps sending them to their respective service centers would be a first step.

Bax-

The Hitec7940TH are high voltage servos. They're part of Hitec's premium line of digital high voltage servos. I did send the servos back to Hitec for them to evaluate/repair if they are indeed damaged. Per my first post, I also had this problem while using a 6V NiMh battery as well. Is it possible that running the Rx in HR mode instead of Normal mode coupled with the high amp draw is degrading the signal strength just enough to cause eratic behavior? I used the JR servos with another reciever for years with no problems. It wasn't until I started using the 614FF that my problems began. Im just trying to look into all possible causes to prevent it from happening again. Does it matter that I'm using channels 1&2 vs. 3&4? I would imagine that it doesn't make a difference. Any suggestions are greatly accepted.

On another note: When do you expect the new 614FS Rx to be available?

Thanks again,

Matt