Pin diagrams for Futaba receivers?

[surveywaters]

I have a mix of hi tec and futaba receivers. I need to figure out what wires go in which pin slots for the ESC, servo and battery test pack. I believe the older hitec was reverse polarity and I'm not sure what's what here. I can't get anything to work. All wires are either red, black, or white.

[GoMachV]

The order is white red black and I can't think of a standard futaba receiver where the white (notch side) didn't go towards the center of the receiver

Airtronics was reversed red and black, possibly other companies as well. With the futaba order (red center pin) plugging in backwards technically shouldn't hurt anything, just won't operate.

[surveywaters]

Thankyou!

Is it possible for an ESC to stop working overnight? My RC10 worked fine yesterday, today it won't do a thing, I can't even operate a servo with power from the ESC. I have three esc's and four receivers, today I can only get one of each to work! Could my new NiMh battery have messed them up, up until now I have only used NiCd.

[GoMachV]

Anything is possible but first check all connections and make sure the switch is ok. When plugged in and switched on, do you get a jitter from the servo or a led on the speed control flash? Anything?

[surveywaters]

nope. I even tried the 4AA battery pack in the receivers to test the servos and nothing. Makes me think all the Futaba receivers are bad. from left to right I have wh/r/bk on the servos and empty/r/bk on the battery pack.

[GoMachV]

Yeah that part is correct then. You don't even get a jitter out of the servos? I would expect them to at least twith when power is applied.

The "batt" socket is not always directly connected to the servos, there is sometimes a circuit that the power travels thru first, but the channel one and two are usually directly tied together with power and ground. Just so you know how it is isolated. When the esc is powering the receiver you should have voltage to the rx and even if the receiver is dead the servo should twitch when it sees power

Can you test the voltage at the speed control to the receiver to make sure it is outputting voltage?

[surveywaters]

I hooked up a pack to each speed control in question and checked for voltage on the lead that would connect the receiver. I get nothing from my Novak T4, I have ~1.5v on the Futaba MC128, and ~6v on the Aristo-Craft SP-2040R. Im guessing the last one is the only one working. The ovak was working yesterday.

[surveywaters]

might be worth noting the aristocraft has giant heatsinks and 12 mosfet finals. It's kinda beefy looking and may be upping the output

[GoMachV]

That's odd that the Novak would work one day and not the next. Double check the switch? Also odd that the receiver isn't working off a separate pack tho.

[surveywaters]

novak doesn't have a switch. there are some wires cut real close to the casing. I wonder if someone hard wired it.

[GoMachV]

There are 2 red wires that should be cut (solder together for 4 cell use) I can't recall what color the switch wires are but there should be some. May be worth opening the case to see if one is broken. No voltage could just be that simple

[surveywaters]

awesome! the novak is sending about 6v now. The switch wires were cut super close to the housing and apparently just twisted tother. I trimed and soldered them. Now the futaba, it is only putting out 1.5v and the others are at 6v. Is it shot? I guess there is a transformer or resistor stepping down the voltage?

[surveywaters]

Servos are twitching now with two out of three ESC's. Maybe I had the test pack wired wrong when I was testing servos and receivers with out the ESC.

[GoMachV]

The futaba is likely dead, the 112's were pretty flaky