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[barry park]

Eh! Martin old chap!
Check the picture. It's one of half a dozen I've operated on.
You can't see the repair as it's a link on the opposite side.

The others were the Acoms of the old+ - s pin sequence.There was a steady trickle from people plugging their new Acoms,Futaba,Hitec batteries into second hand boats supplied with R/C.

The one above is mine but I still maintain reversing batteries is down solvent abuse and not some silly Darwin theory by Malcolm Frary.
Barry Park

[barry park]

Hi Steve,

I agree with Barry that the receiver is almost certainly damaged. Me, I would hand the receiver to another modeler or model shop and ask them to check it with separate servos and battery pack, just to be sure.

Glad Chas is ,Steve,because I'm less certain as I've spotted a potential interference problem. I'm only 66% certain you have damaged your receiver. :-\
A sure sign of damage can be found inside the case. Look at the components with a lens. If the bec components or an Electrolytic capacitor looks damaged then bec can be desoldered and bypassed and capacitor replaced.
Capacitor fault is unlikely as these usually only pop at long term overstressing.Concentrate on the larger components on the underside of the board.
If you have an ammeter ,measure the mA current consumtion with no ESC or servos. It should be within 10% of the published spec. Do it with the tranny on.Increased current shows damaged bec.
I defer to Malcolm Frary,the fast electric guy as I've just noticed your ESC is  OPTO(coupled).
I don't know if JETI have fully separated the "powerpack" ground from the receiver ground or just opto coupled the gate drive.He'll know and he will also confirm that separate grounds should be avoided due to interference.
If you have no continuity,a wire link between grounds is advisable and then tie to stern tube and motor case.
You can confirm continuity with a meter on ohms range or continuity buzzer or even using a bulb,battery and wire.
Regards
Barry Park

[Johnn]

That happend to me :(

I had to ditch it because I knew nothing about boats then! :(