chamberlain Ml1000 garage door opener

[JoeF]

Thanks for that Joe, it is the connectors inside the back of the door opener.
I could realy do with a circuit diagram, but I cannot find one on line.
Thanks,
Bob.

Hi Bob,

thanks for your email,

for a diagram of the circuit board the best point of contact would be Liftmaster as they should have one of these.

Regards 
Joe