So, I have a Hitachi SR-604 that was DOA. No external fuse holder, so I opened it up and sure enough the fuse was blown. What was interesting is that the meter I used to check continuity is part of a kit, which also includes one of those AC detector probes. So, the detector was sitting probably 4" from the silver face of the receiver. I replaced the fuse and as soon as I plugged the unit back in, that detector went nuts. I though that was odd but proceeded anyway. I hit the power button and the unit lit up for maybe two seconds before blowing the new fuse.
Upon closer inspection, I noticed the board was singed around all four pins of one of two S4VB rectifiers. Upon closer inspection from the top, I saw that this rectifier had stress fractures in the plastic, like it had exploded from the inside. I also noted that the good one had a red dot on it, but the blown one's dot had turned black.
First question: The component is labeled "S4VB" only. All of the replacements I am seeing are labeled S4VB-5, or -10, or -20 or even -60. How do I know which one I can use? Does it even matter?
Second, are there likely components upstream that would have caused the failure that I should look for? Likewise, are there downstream components that would have likely been destroyed when that component went out?
Lastly, is the rectifier alone a reasonable explanation for the behavior of the AC detector, or should I be looking for additional issues? TIA.
