I know this is the place to come for the definitive Jaguar info - I hope someone can help me.
First some background: I bought this Jaguar untested in a big cheap lot today off CL. I saw rust on the cartridge port screws when I looked it over at the sale, so I was not too optimstic, but it was part of a big lot so I just took it. Sure enough, it's definitely been in water and has a lot of water damage and rust. After failed attempts to power it on, I opened it up...it looks like someone punched the top and broke the switch...the internal switch is completely trashed.For the heck of it, I stuck my needlenose pliers in the switch to join the contacts and it actually powered on.
Encouraged, I cleaned it up very well and checked it over. Nothing is burnt out on it, and after cleaning it up the board doesn't look TOO bad, the damage appears to be isolated to the switch with no other board damage. I was able to get most of the rust cleaned up and it was just surface rust. So I put it back together and plugged in a game, attaching it to my TV via RF. I got immediate boot-up to the game, but no sound. There's also no sound at the Jaguar title screen (it's supposed to roar and play a song I believe). Mine is silent.
I checked all the basic things first, like switching between ch 3&4 and switching the Jaguar's RF Out. I turned the TV all the way up and I don't hear even the faintest sound. I removed and opened up the RF modulator on the Jag but couldn't find anything wrong with it. I also found a pinout of the AV pins and used some alligator clips to try and pick up any sound off the AV connector and was not able to pick up anything.
I've read that attaching the wrong power supply can kill power modulators. This Jag doesn't show any signs of that as it powers up and looks great, but is silent. I know that the audio section has its own separate power modulator. Can I test this? The sites I read said that when it dies it often distorts or melts on top. Mine shows no damage. There are what appear to be Test Points on the board that I've been checking with my meter. I get voltage at every one I've found except for TP6 which is directly connected to the audio power modulator. There is almost no info about Jaguar repairs on the internet so I'm totally shooting in the dark here. Am I chasing my tail? Is there any way to save this thing???