I can only tell you that I owned a JVC and that the cost to look at and give me an estimate was 1/5th of the value of the camera. Then, parts are not cheap, etc.
Unfortunately, video cameras have become the toasters of 2003.
If you were a bad guy you could walk into the local Wally World, buy a new identical one and then put the old one in the box and take it back. Not suggesting that, but Wally world is a big fat cat coporation you know...
BTW, Ebay shows a buy it now of $189 for a NIB A300. Then, you could probably sell you old A300 to somebody else on ebay for $75 or so. You would not believe how many people are willing to take a chance for 40 percent of new.