I have a question regarding my HS-5645MG servo.

I have a 75MHz Novak XXtra receiver controlled by an Airtronics MX-3 3-channel transmitter. I would like to use this receiver in my Traxxas E-Maxx along with a Hitec HS-5645MG digital servo for my steering servo (channel 1), the Traxxas/Novak EVX speed control (channel 2), and the Traxxas 2055 servo for my shifting servo (channel 3). In the channel 1 slot, the digital HS-5645MG servo doesn't seem to respond at all. However, when I tried it in the channel 3 slot, it works fine. My analog Hitec HS-645MG (which is currently the steering servo in my E-Maxx) will work just fine in either the channel 1 or channel 3 spot though (again, with the EVX as the speed control on channel 2). All of my other analog servos (Hitec HS-925MG, JR Z650M, Airtronics 94102, and Futaba S3003) also seem to work fine when plugged into the channel 1 spot on the XXtra receiver and EVX.

The digital HS-5645MG servo works just fine when plugged into my other cars (Novak XXL receiver and LRP IPC 7.1 ESC) as the steering servo on channel 1. I have even tried the XXtra receiver with the LRP IPC 7.1 ESC and the Hitec HS-5645MG servo still does not operate when on channel 1, but will operate when on channel 3.

Any ideas on why the Hitec HS-5645MG servo does not respond in the channel 1 position on the Novak XXtra receiver (but will work when on channel 3)? By the way, I have one of the older HS-5646MG servos (it says "Revised 2001" on the side of the casing), if it makes any difference.

Hopefully you can give me an answer as to what's wrong here. Thanks in advance!

Make sure it is in the CH. 1 and not the BEC/DSC slot on the Xxtra.

I have done that several times.....

Nope, that was the first thing I checked. Also, like I said, I've tried other servos in the channel 1 slot and they've worked when the HS-5645MG didn't.

I've heard that some Hitec servos don't play nice with some receivers, so I'm wondering if that's the case here. But then again, I find it odd that it works on channel 3, but not on channel 1.

I have not seen this issue....

There are several local guys running a Xxtra & HS-56xx series servos with no issues.

I have used the Xxtra rx with serveral HS-59xx series with no issues either....



When you turn on the ESC, does the servo try to center up?

The servo does nothing. It just sits there, no sound or anything to indicate some sort of load on the servo. However, when I plug it in the channel 3 slot, it moves just fine from endpoint to endpoint (since the 3rd channel on the MX-3 is just a toggle switch, not a proportional-type control).

The servo works fine (full proportional movement, etc.) when plugged into my Novak XXL recievers though.

I know, it's really weird, since the servo works on channel 3 of the XXtra receiver and every other servo I have works fine on channel 1.

Any updates?