REPAIR futaba reciever

[GREEN1277]

I have a R114F reciever that has 3 flights on it. One day went to preflight check operations on the plane (XPD8), every thing worked except the throttle thought I lost a ecs after doing some diag came to the conclusion it was one channel on the reciever, So I was wondering if it could be fixed? I have moved on to a spectrum radio since then but I still have use for the futaba tx and rx. Want to teach my daughter how to fly (cheap trainer). If anyone has any Ideas.

[Bruce Abbott]

Yes it can be fixed, you just have to replace the decoder chip (identified by the large red box in the picture below). I don't remember what the original chip was, but I replaced it with a 74VHC164.

The decoder was probably damaged by plugging in an ESC with reverse polarity. To prevent this from happening again you can cut the track going to CH3 and insert a current-limiting resistor. I used 330 Ohms (identified by the small red box in the picture below!).

[GREEN1277]

WOW, Thanks Bruce guess you just had that pic laying around. any thoughts on where to get that chip? Thanks again

[prasrock]

i ant ckt diagran of transmitter and receiver used in syma helicopters

[Bruce Abbott]

any thoughts on where to get that chip?Digikey (http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=TC74VHC164FTMCT-ND)

Mouser (http://www.mouser.com/Search/ProductDetail.aspx?qs=iXS6m0csglKjnf37El4Bpg%3d%3d )

[Rodney]

Your chip may be fine, check for a cracked pc trace between the chip and the signal pin at the throttle connector or a bad connection right at the plug-in connector (the pin could have gotten pushed in away from the trace while inserting the throttle connector). If that is the problem a little solder will correct it.

[Markz]

i ant ckt diagran of transmitter and receiver used in syma helicopters

...I WANT newcomers to be nice and polite when asking questions like that

Good manners are an asset nowadays ;)

Marc

[Ron van Sommeren]

Not a native speaker?

Vriendelijke groeten ;) Ron

[GREEN1277]

thanks for help guys...I will report in when I get a chance to fix reciever. I think it may be the chip Bruce was talking about, because it went bad after I tranfered electronics from one plane to another but will check all options given.
thank again.