Servo problems (confused)

Nordklint

Member
Messages
7
Hi, first time post! Fairly new to RC, bought an AMP Crush for my 4year old in April and an AMP MT kit for myself a couple of months later. Had a lot of fun with it and driving was pretty reckless so no surprise when my AMP MT after a flip completely lost steering. After some detective work and cross testing between my MT and Crush I figured out that the servo was dead. So I ordered a new one, a Power HD LW-20 MG! But when I plugged it in to my MT it only responded to my first 2 turns an then it stops and only a quiet ticking sound can be heard from the servo. I then plugged in my new servo to the Crush and it turns fine. So maybe there is something wrong with the ESC on my MT I thought and plugged the servo from the Crush in to it and to my surprise the gears are turning. How can this be? The ESC in the MT and Crush looks to be the same so why is the new servo not “compatible” with my MT? Any ideas? Please help.
 

WithinU

Well-Known Member
Messages
314
Location
Land of Oz
Just a stab in the dark, but in your partaking of the RC air ballet, you could have damaged your ESC/RX component as well.
Did you happen to test the old servo on the other car to see if it worked on that one too like the new servo?
IF the ESC/RX is the same in both cars, try swapping that out from car to car, and see if the malfunctioning servo follows. If it does follow, than I would highly question the ESC/RX component.
 

Nordklint

Member
Messages
7
Just a stab in the dark, but in your partaking of the RC air ballet, you could have damaged your ESC/RX component as well.
Did you happen to test the old servo on the other car to see if it worked on that one too like the new servo?
IF the ESC/RX is the same in both cars, try swapping that out from car to car, and see if the malfunctioning servo follows. If it does follow, than I would highly question the ESC/RX component.
Yes I tried the old servo on the Crush as well and it‘s completely dead.
I also connected the ESC/RX from the MT to the Crush servo (not by swapping them but by parking the cars next to each other and swapping the cables over) and was able to turn the wheels on the Crush so there is nothing obviously wrong with it. Really odd.
 

Thunderdonkey

Member
Messages
10
Yes I tried the old servo on the Crush as well and it‘s completely dead.
I also connected the ESC/RX from the MT to the Crush servo (not by swapping them but by parking the cars next to each other and swapping the cables over) and was able to turn the wheels on the Crush so there is nothing obviously wrong with it. Really odd.
Could it be a mechanical problem in the servo? If the gears are damaged it may be able to turn the wheels when there is no load, but not when there is a lot of friction.
 

Nordklint

Member
Messages
7
Could it be a mechanical problem in the servo? If the gears are damaged it may be able to turn the wheels when there is no load, but not when there is a lot of friction.
Could it be a mechanical problem in the servo? If the gears are damaged it may be able to turn the wheels when there is no load, but not when there is a lot of friction.
Hmm no I don’t think so, it’s brand new and the servo works fine when tested through the Crush.
Did another test right now and it’s like the MT is to weak to move the gears. It responds from the first couple of turns on the radio then nothing. (All batteries are charged). Could it have something to do with voltage on the servo? Does it have to match the battery voltage? It says 4.8-6.6v on the servo spec, battery is 7.2v.
 

Thunderdonkey

Member
Messages
10
The ESC normally regulates the battery voltage down to 5V or 6V for the servos. The standard servo in the AMP MT is rated 4.8 to 6V so your new servo should be OK. You may have a bad electrical connection. Hold the steering hard over to one side. Waggle the servo plug in the receiver and see what happens. If the servo jerks about, its a connection problem.
 

Nordklint

Member
Messages
7
The ESC normally regulates the battery voltage down to 5V or 6V for the servos. The standard servo in the AMP MT is rated 4.8 to 6V so your new servo should be OK. You may have a bad electrical connection. Hold the steering hard over to one side. Waggle the servo plug in the receiver and see what happens. If the servo jerks about, its a connection problem.
Thanks, tried what you suggested but didn’t really get anything out of it. Anyhow, order a new stock ECS/RX, let’s hope that’s working!
 

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