123Splat
Posts: 409
Joined: 4/27/2007
From: Austin, TX, USA
Status: offline
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Well "COULD" be a stall. When the tank stops, is the right stick at null or just close to null?
Stall is just that. At a certain power level, the motor stops running because (usually) of some mechanical load overpowering the motor's output. Motor turns into a big inductor and passes more and more current. Stall problem only exists electrically when the motor has power (Usually that is NOT the case when the tank is supposed to be stopped, right stick at null).
Pull the motor in question and check on how freely the shaft will turn with the motor out of the gear box. If it is binding, you will have to disassemble the motor to discover the cause (could be a number of things).
If motor turns freely out of gear box, obviously, the next thing to check is the gears and the motor's pinion to gearbox mesh with the motor re-installed. If you now have binding load on the primary gears in the gearbox (the ones where the motor connected, not the gearbox output shaft), you could probablly fix that by gear break-in process, followed by judicious cleaning and re-lube of the gearbox.
If none of the above.... you might have an imbalance in the motor drive (commonly compensated by setting the trims on the xmitr). Cause could be output of the driver board electtonics or the xmitr signal biases. If so, with low or null inputs from the xmitr, the driver board is still getting input from the opposing drive (trim bias the forward/reverse drive to x clicks reverse, in zero bias, the motors still want to run forward, so you trim to reverse until the motors stop at null stick, if the trim gets bumped, at null stick the motors still get power, but not enough to move the tank). In your issue, if this is the case, it would be with the left/right trim for the right stick if it is just one motor humming. This is more likely than a motor stall.
BUT,,, is the humming comming from the motor(s), or the speaker? that would be another issue.
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It's not the takeoff or the flying, it's the landing and repairing, so I can takeoff and fly again...
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Tanks >> Electronics question 
Electronics question - 
Can anyyone tell me the resistive value for the resistor R12 on the receiver board in my tank? I have an S&S Panther with a bad cannon. Was working sort of, now it does not work. I get 2 volts at the motor, and I traced bsack to a charred black and silver resistor on the receiver board in the tank. All other motors get around 6 volts, so I would assume this is the issue. Also, the shooting LED no longer lights up, but that's understandable since the dropped voltage for it is from the 2 volts instead of 6 volts. 
). Is that a stalled motor? If so, how do I fix it?