Das Wettringer Modellbauforum

Hi Matt,

gerne wollen wir Dir helfen. GWS-Empfänger und Mikromodellkomponenten sind bekannt.
Lediglich Dein Problem ist nicht klar.

Prinzipiell ist es sehr einfach:

• Du verbindest den Empfänger mit dem Empfängerakku
  
• Im Sender und im Empfänger muss das gleiche Quarzpaar sitzen - ACHTUNG: nicht vertauschen! Der Sender-Quarz ist anders, als der Empfänger-Quarz
  
• Du schließt alle Servos an den Empfänger über die 4 JST-Steckbuchsen
  
• Servo-Anschlusskabel: ROT = Spannungsversorgung plus, SCHWARZ = Spannungsversorgung minus (GND), WEISS / GELB / ORANGE = Signal
  
• Alle Drehservos haben einen Arbeitsbereich von üblicherweise +/- 60°

Es würde uns helfen, wenn Du Dein Problem etwas genauer beschreiben könntest. Ein Foto zu Deiner Verdrahtung hilft dabei auch sehr.

Gruß,
Johannes

(In case that it's easier for you to describe your problem in English language then go for it - we will manage, no worries)

Hi Matt,

(an alle Mitleser die Bitte um Nachsicht - in diesem recht speziellen Thema ist es für Matt vermutlich deutlich einfacher zu verstehen, wenn seine Frage in Englisch beantwortet wird)

The problem you describe is pretty unusual in various respects. First of all almost all servos are showing a mechanically limitted working range of maximum 300 degrees. This is caused by the fact that the final drive shaft is connected to an electric potentiometer (variable resistor) which has mechanical end stops.

My proposal is to try the following steps:

First test: When you connect the servo to power (only plus and minus / red and black wire) leaving the signal line disconnected the servo must stay in a constant position, mostly where it has been at the moment of power on. If it doesn't then it looks as if the servo has a failure. In case of a broken connection of the internal potentiometer wires inside the servo the servo motor will continuously run in either direction showing the failure you described. In theory also the electronic control printed circuit board could have a failure - but this happens extremely seldom.

Second test: If the servo behaves right according to step 1 then try to connect it to the receiver without having the transmitter powered. Also in this case the servo must stay in a fixed position.

Third try: Via EBAY you can buy for very small money so called servo testers (less than 5 Euro) - connecting such a servo tester to the servo and the battery allows you to set the servo position manually using a rotary knob. This way you can easily confirm that your servo works correctly.

According to my experience a transmitter failure as well as a receiver failure will not cause the sympton you are discovering. This means: you need to validate somehow the correct function of your servo. Please also check carefiully that the wiring of your servo cable is done in the right way and that no pins ae pushed out of the JST connector.

One more: for the beginning pls just connect the servo only without any other motor control etc. If you don't manage to get one channel running it's no help to increas the overall system complexity. You can connect the servo to any of the four JST plugs.

Would be great if you can report the results of your checks according to above recommendations.

Good luck,
cheers,
Johannes

Hi Matt,

As usual it's pretty difficult to fix a probllem from abroad without sufficient knowledge about the installation and wiring. But I'll try my best:

First: The quarz for transmitter and receiver both have (must have) the same channel number (Ch 51 in your case). Mostly the same frequency is printed on small labels (40.625 Mhz).
But (!!!): these quarzes are ni fact different. So it is important to use the TX quarz for the transmitter and the RX quarz for the receiver. Swapping them will disable the radio communication.

Second: Please invest 5 bugs into a servo tester such as: https://cgi.ebay.de/multi-Servo-tester-3…=item4aa9619619


This small test device will allow you within seconds to confirm correct function of your servos or motor controls. When you are able to exclude servos and motor controls from your overall system problem then it can be limitted to questionable transmitter/receiver devices.

I'm afraid that's all I can do for the moment. Probably some detail pictures from your installation, especially with regard to wiring, would help investigation.

All the best and good luck!
Cheers,
Johannes