N72 stopped passing signal

[craigmorris74]

I have an N72 that has worked great for several years. Today I tried to use it, but it wasn't passing signal. I got pops at the last three or four gain switch positions. My guess is that there is a problem with one of the pads associated with the switch. Does this seem correct, or could there be other things to look for? I wanted to get some other ideas before I opened it up.

Thanks,
Craig Morris

[tpryan]

Has it been moved recently?

Can you hear the noise floor increasing with each gain step?

The vast majority of problems are due to bad soldering. Try re-flowing all of the joints around the rotary switch and associated resistors. Verify that your transformer wiring is correct.