HYS TC300n amplifier problems

[B C]

I have a TC300n amp that suddenly has decided to only work when it feels like it. It will not key up at all on AM, but on SSB it will key and act "kind of normal" for a couple of minutes then it takes fits . Sometimes it will start to work on SSB and then shut off. The next key up it may or may not work.
I have been searching for a good schematic with a components listing but so far the well has been dry.
I realize these are not exactly "top shelf" amps, but when it did work it was very good on both AM and SSB. On AM I drive it with 1 to 1.5 watts, and really try to tip toe with it on SSB so as to not overdrive it.
It had been just fine, then yesterday afternoon I tried to use it after it had been off for a week or so, and it wanted to play games.
Anybody got any thoughts or ideas (other than the garbage can) to bring it back to life.

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[MDYoungblood]

It is a Chinese RM Italy clone, with the exception of a few parts you could use a RM schematic. First thing to look for in these cheap amps are cold solder joints, next are cheap switches, and go down the line on components. Never toss electronic equipment in the trash, keep it as parts for the next one you buy or recycle.

3's

Greg

[B C]

Thanks Greg, This one uses surface mounted devices so I have to get my team of micro-people to get in there and work it over.

B C