the only issue I have had with my 740 is the power plug. Every other manufacturers power plug that i have owned was a plug that sat firmly in the socket and had a ring or other device that secured the plug whereby you knew that the plug was solidly secured. Using two separate power plug cables that I have used have had interruptions of service. I solved this by adding some tiny amount of solder on the plugs that makes a tight fit.
shouldnt be that way . The plus and the socket should be designed so that the fit is solid and it also is secured by some added measure such as screw ring, screwed down plug, etc.
otherwise a great unit. John D.