Testing a Dead VT52

I acquired a dead VT52 DecScope today and I am going to attempt to revive it. I have a copy of the VT52 maintenance manual. I am also getting a second one that "lights up" in about a week. I am hoping to be able to create at least one functional VT52. Does anyone here have any experience repairing a dead VT52 DecScope? When I apply power, I hear a mild hum coming from the transformer area, but there is nothing on the screen.. no cursor, no raster. I just turned it on this evening and have not followed through the debugging information in the manual. One thing I did notice is that the manual talks about a fuse on the back. There is no fuse on mine, but I do see what appears to be a circuit breaker button on the right side near the on/off switch. Any ideas from experienced folk would be welcome! Thanks, Ashley