*Hitec 5645MG Problems*
04-25-2008, 06:29 AM
#1
*Hitec 5645MG Problems*
I have the Hitec 5645MG digitals in my new WH Extra 260 and I noticed something odd during my test run of the engine. While working the servos I noticed that some times when you let the stick go back to nutral on the Ailerons one servo would pause for a few seconds before returning to nutral. This was a pause not lag time. I thought maybe my batteries were a little low so after a full charge I still had the problem. It doesn't do it all the time and this plane is grounded until I figure out what is going on. Not sure if it's the servos or the radio (JR 7202 / R790 PCM receiver). I am in the process of swapping out the radio and receiver for the new Airtronics RDS8000. Anyone else having any problems with the HS-5645MG Digitals ?
04-25-2008, 12:06 PM
#2
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RE: *Hitec 5645MG Problems*
Are your extensions good quality, and 22awg?
If they are, clean the contacts the best you can, of just try a different extension.
Let me know how you make out.
Bob
If they are, clean the contacts the best you can, of just try a different extension.
Let me know how you make out.
Bob
04-25-2008, 05:05 PM
#4
RE: *Hitec 5645MG Problems*
ORIGINAL: bob_nj
Are your extensions good quality, and 22awg?
If they are, clean the contacts the best you can, of just try a different extension.
Let me know how you make out.
Bob
Are your extensions good quality, and 22awg?
If they are, clean the contacts the best you can, of just try a different extension.
Let me know how you make out.
Bob
06-21-2008, 04:10 PM
#5
RE: *Hitec 5645MG Problems*
Believe it or not, I've had this happen once again with a different HS-5645MG servo on a different plane and now on the Airtronics RDS8000 2.4 radio setup. The trouble is, I've bought so many servos that I can't remember what serovs I got from what online store. Last time I took no chances and swapped out the servo and extension. Looks like I'll have to pay for this one since I can't remember where or when I got them.
06-21-2008, 11:14 PM
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RE: *Hitec 5645MG Problems*
You didn't mention if you were using a voltage regulator or not.
As unlikely as this seems, I had a similar problem with 5955's on my elevator, which occasionally would hit full deflection in my shop, and then stay there with a 1-2 second delay before returning to neutral. The problem was not actually caused by the servos but by the "regulator" I was using for the RX battery. I had a Castle BEC installed as a regulator for dropping the voltage from Fromeco LiIon's down to 6.0V for the receiver. I had a 2nd Castle BEC for the ignition set to 5.0V. Turns out that the Castle BEC was the problem. It wasn't defective or anything, but since it was only dropping 1.4 volts or so (from 7.4 down to 6.0), this type of "regulator" is not as stable as a standard Fromeco or other regulator. It needs to drop more voltage to run stable. I only discovered this by methodically disconnecting, replacing servos, switches, batteries, and then the Castle BEC. I replaced it with a traditional Fromeco regulator set at 6.0V and problem was solved.
Oh, by re-adjusting the same Castle BEC down to 5V it works fine with the servos. However, I wanted the higher voltage/speed on the servos. I've since used this same BEC for ignition on another plane, no problem.
As unlikely as this seems, I had a similar problem with 5955's on my elevator, which occasionally would hit full deflection in my shop, and then stay there with a 1-2 second delay before returning to neutral. The problem was not actually caused by the servos but by the "regulator" I was using for the RX battery. I had a Castle BEC installed as a regulator for dropping the voltage from Fromeco LiIon's down to 6.0V for the receiver. I had a 2nd Castle BEC for the ignition set to 5.0V. Turns out that the Castle BEC was the problem. It wasn't defective or anything, but since it was only dropping 1.4 volts or so (from 7.4 down to 6.0), this type of "regulator" is not as stable as a standard Fromeco or other regulator. It needs to drop more voltage to run stable. I only discovered this by methodically disconnecting, replacing servos, switches, batteries, and then the Castle BEC. I replaced it with a traditional Fromeco regulator set at 6.0V and problem was solved.
Oh, by re-adjusting the same Castle BEC down to 5V it works fine with the servos. However, I wanted the higher voltage/speed on the servos. I've since used this same BEC for ignition on another plane, no problem.
06-22-2008, 03:46 AM
#10
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RE: *Hitec 5645MG Problems*
I had the same problem, only to find out that my transmitter was 'Swamping' the rec'r...try it with the antenna all the way down and move away 8-10' and see what happens..am using a 9303 JR radio.....
06-22-2008, 07:13 AM
#11
RE: *Hitec 5645MG Problems*
RCAddiction,
I am not using a voltage regulator.
Jimmy Bananas,
I'm using an Airtronics RDS8000 which is 2.4 Ghz, there is no antenna to pull out. Not sure what you mean by 'Swamping' the rec'r. I had this happen on an FM setup and now on 2.4. On the FM setup I swapped out the servo and extension, problem solved. I plan on doing the same on this one.
Thanks for the input guys.
I am not using a voltage regulator.
Jimmy Bananas,
I'm using an Airtronics RDS8000 which is 2.4 Ghz, there is no antenna to pull out. Not sure what you mean by 'Swamping' the rec'r. I had this happen on an FM setup and now on 2.4. On the FM setup I swapped out the servo and extension, problem solved. I plan on doing the same on this one.
Thanks for the input guys.
06-22-2008, 09:09 AM
#12
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RE: *Hitec 5645MG Problems*
It sounds a bit like the radio is going into failsafe lockout and is holding servo position at last position for a second or 2. Since it's happened with JR PCM and with Airtronics 2.4, it has to be something you didn't change.
Best thing to do is to plug another servo into the receiver port to see if it does the same thing. It well could be the servo has a vibration issue. This can happen with any servo, not just Hitec, and not just the servo you have.
Also, try bypassing your charge/switch and connect the battery directly into the RX.
Swamping the RX - the RDS8000 has a pushbutton, I believe, which is used for range testing. It works a bit differently than some 2.4 radios, so be sure to check manual. I'd be surprised that this is it, but it's worth a shot.
Best thing to do is to plug another servo into the receiver port to see if it does the same thing. It well could be the servo has a vibration issue. This can happen with any servo, not just Hitec, and not just the servo you have.
Also, try bypassing your charge/switch and connect the battery directly into the RX.
Swamping the RX - the RDS8000 has a pushbutton, I believe, which is used for range testing. It works a bit differently than some 2.4 radios, so be sure to check manual. I'd be surprised that this is it, but it's worth a shot.
06-23-2008, 04:28 PM
#13
RE: *Hitec 5645MG Problems*
RCAddiction,
Thanks for the info. The engine is not running when I'm getting the problem and it's on one servo only. The same servo (left Aileron) with two different radio system, JR PCM and Airtronics 2.4. I checked the range test button but it only stays on for 3 minutes but I've turned the system off and started over. I'm still checking but will probably be sending the servo back to Hitec since they have a 2 years waranty.
Thanks for the info. The engine is not running when I'm getting the problem and it's on one servo only. The same servo (left Aileron) with two different radio system, JR PCM and Airtronics 2.4. I checked the range test button but it only stays on for 3 minutes but I've turned the system off and started over. I'm still checking but will probably be sending the servo back to Hitec since they have a 2 years waranty.
06-23-2008, 04:42 PM
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RE: *Hitec 5645MG Problems*
The 5645's are notorious for centering issues. I use them still, and have pretty good luck with them as I feel they're a great value servo. It sounds as if your servo has a pot issue. You should send it in. Also, you could try cycling the servo end point to end point for quite awhile and see if it gets better.
06-23-2008, 06:15 PM
#15
RE: *Hitec 5645MG Problems*
ORIGINAL: mtwister
The 5645's are notorious for centering issues. I use them still, and have pretty good luck with them as I feel they're a great value servo. It sounds as if your servo has a pot issue. You should send it in. Also, you could try cycling the servo end point to end point for quite awhile and see if it gets better.
The 5645's are notorious for centering issues. I use them still, and have pretty good luck with them as I feel they're a great value servo. It sounds as if your servo has a pot issue. You should send it in. Also, you could try cycling the servo end point to end point for quite awhile and see if it gets better.
06-25-2008, 05:54 AM
#17
RE: *Hitec 5645MG Problems*
ORIGINAL: Mr. Mugen
What battery are you using? How old is it? Have you tried load testing it?
What battery are you using? How old is it? Have you tried load testing it?
06-27-2008, 04:33 PM
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RE: *Hitec 5645MG Problems*
Zippi, Call Hitec service. Tell them the servos have a problem and you want to look at them. Send them a copy of the latest invoice. I have had 3 Hitec servos with different issues. They have been very good about repairing or replacing them with no charge. Turn around time is also very quick. But get the name of the tech you talk to and send them to his attention.
Mike
Mike
