Receiver Problem

[wswatzell]

This one has me stumped. :huh: The receiver in my friends’ boat works only if the battery pack is plugged directly into it. If I put a switch in between it & the battery, it will no longer work. I tested this with several switches, as well as different battery packs. I used a volt meter to make sure that the switch(S) was good. One is brand new. There is only a very small voltage drop from the battery pack to the end that plugs into the receiver, compared to measuring the voltage out of the battery pack alone. I took the case off the receiver to find that the back of the circuit board is a distorted, but no visible corrosion on any contacts. I then plugged the battery pack in the receiver & measured the voltage on the back side of the circuit board where the battery plugs in to make sure that the connection was good. It read just a little lower (.2volts at most) than at the lead. I did this test with both the battery plugged directly into the receiver, as well as with a switch. I get almost the same voltage reading.

Any ideas on this? I don't understand why adding an on/off switch would make the receiver quit working.

 

[gil sonsino]

What radio is it cause some have experienced this problem when they plug connectors without guides in the wrong way.Recently I bought two micro hobbyco servos to be used on my futaba receiver and as they do not have the guide of futaba servos it is possible to connect them in the wrong position and obviously they won't work!.Otherwise there is no apparent reason for this problem.The drop you 've observed is only caused by the resistance of the switch

My 2 cents Wade.

Gill

 

[Bob Kensill]

If there is an unused servo slot left open in the receiver,try plugging into that one.

 

[poolschool]

Do the connections look

1. clean

2. fit tightly

3. clouded soldered joints on circuit board (hot joint)

As Gil has suggested, the voltage drop is in the resistance of the switch contacts. Don't forget that when you test for voltage with a meter etc you are not applying any sort of load to the circuit. When you connect the battery to the circuit and try to move servos you are applying load current, this is when if any of the above is the cause, the receiver will not work - you are getting voltage but NO CURRENT.

See how you go

Gino

 

[snowdog-2112]

What radio is it cause some have experienced this problem when they plug connectors without guides in the wrong way.

Wade,

I scratched my head over this one for a bit and the only possibility I could come up with is what Gill posted.

Try changing the power plug direction as he mentioned.

"3. clouded soldered joints on circuit board (hot joint)"

Poolschool, those of us in the electronics field call that a "cold" solder joint.

Snowdog

 

[wswatzell]

Well, they are Futaba servos, receiver, & switch so when the case was on the receiver I could only plug everything in, in one direction. <_<

I knew why the voltage drops, that is why I wasn't concerned about that.

I will have to look at the reviver in better light to see if I can see a cold joint. That has to be the problem. The switch (I think would put more load on the circuit than just the battery alone because of the extra resistance)

Thanks for the help; I'll let you know what I find.

 

[gil sonsino]

So it is a cold solder in the plug area on the receiver..

I 've already experienced this with a cat. Just checking the radio operation before the heat everything was Ok....but after fired the engine a big mess with the throthle.

Gill

 

[wswatzell]

I don't know if that is what is going on yet. I will have to look when I get home.

 

[TimD]

"3. clouded soldered joints on circuit board (hot joint)"Poolschool, those of us in the electronics field call that a "cold" solder joint.

Snowdog

Also known as a "dry Joint".

Tim.

 

[Propjockey]

Also known as a "dry Joint".

I thought it was a good thing to keep your...................oh, never mind.

 

[TimD]

I just knew someone would pick that one up PJ!

 

[Mike Stewart]

moist and sticky is the best joint connection. Isn't it? :lol: B) B)

 

[EatMyShortsRacing]

For shame.....

degenerating into an illicit drug discussion.......

EMS Racing We dont take drugs, we pay for them....

 

[TimD]

After 3 hours of desoldering / resoldering a few power supplies last week I started trippin'. :lol: :lol:

TimD AKA Pedro De Pacas!