Eight, nine years ago I succeeded in buying two of those KR-1000. It took time to nowadays to look into. One I opened immediately years ago. Had severall faults and I didn't have the necessary skills to fix. Or, to say the truth, didn't dig deeper. So it still is partially dismantled in a shelf... Blame on me.
The second one I grabbed today. Powered it on - only one channel. Moving the balance around 20 times from left to right - et voila, both channels are ok. So far it seems ok, I checked a lot of those funtions the unit has. But two "faults" there are: can't set volume. Neither up nor down. And the red arrow "high speed amp" don't light up.