DadinlondonUK

<span style="font-family: Arial;">Hi all,</span>



<span style="font-family: Arial;">A very RC inexperienced parent here trying to help a disappointed son&hellip;. Apologies if I posted incorrectly! I do have some science training so all is not lost I hope!! I have read </span>


<strong class="bbc"><span style="font-family: Arial;"> "Electric Guide" </span>[/b]<span style="font-family: Arial;">but I I think my question is more specific
</span>

<span style="font-family: Arial;">My son has a Tamiya 7.2v RC car given to him by a neighbour who went to uni. (lucky boy!!)</span>



<span style="font-family: Arial;">Components are:</span>



<span style="font-family: Arial;">Acoms AP 201 controller 27mhz</span>



<span style="font-family: Arial;">Acoms AR 201 receiver 27 mhz</span>



<span style="font-family: Arial;">Mtroniks HF 250 device (with battery wires and motor controls going in &amp; out.)</span>



<span style="font-family: Arial;">All worked fine for a while but channel 2 has stopped working.</span>



<span style="font-family: Arial;">I have done the following:</span>



<span style="font-family: Arial;">A. Swapped plugs outputting from AR 201 &ndash; channel 1 on AP 201 now turns the wheels successfully but steering is dead (so I guess motor and Mtroniks are OK as the wheels respond)</span>



<span style="font-family: Arial;">When this swap is done, Ch 2 on AP201 still produces no result</span>



<span style="font-family: Arial;">B. I re-connected the outputs from AR 201 to correct sockets. I Joined the control wires from the pots inside the AP 201 and tried both controls &ndash; both Ch 1 and Ch 2 controls produced steering but still no wheels turning. I guess this means both pots in the AP 201 are OK?</span>



<span style="font-family: Arial;">C. I have swapped the crystals around upside down, from AP to AR etc &ndash; no change &ndash; steering but no wheels turning (unless AR 201 outputs are swapped as in A, above) </span>



<span style="font-family: Arial;">I'm guessing Channel 2 is dead, either at the AP 201 or the AR 201 end. </span>



<span style="font-family: Arial;">Should I buy new crystals, an AP 201 or AR 201? The lot? My son reminds me channel 2 went down just after a small bump. Are the AR 201s susceptible to shock damage?</span>



<span style="font-family: Arial;">Any ideas please? All suggestions gratefully received &ndash; thanks!!</span>



<span style="font-family: Arial;">DadinlondonUK</span>