Does anyone have a schematic for my Sanyo M9990. I ripped it apart to clean it and it now refuses to power up. I didn't have any d batteries, but the clock worked under battery power but it doesn't function at all via ac connection. Nor does the amp work with the ac adapter. Seems to be a ground issue. Probably a loose wire or bad solder joint. I received this blaster as a gift from my wife. I'm an avid late 70's hi-fi collector, but I've always wanted a cool boombox.

Here's a service manual for one, which should have a schematic...

Link

The Sanyo M9990 is a lovely boombox, made around 1978/79, I have one and it's one of the best sounding portable stereos I've ever heard. I hope you get it fixed.

Where are you located?

lynn, ma
Do you have a paper copy or pdf?