had this nice VCR i sold to a customer
I set it up in his house and it was fine
2 weeks latter he is having issues

i got it back and tested it.
through the line outputs it seems to work fine
through the RF CH4 modulated output, its a blue screen
It seems the modulator is putting out a carrier,
but no information. If i do the TV/VCR switch, i can see
the TV channels OK on the TV with pass through mode.
I don't have the manual on this beast.
I checked the menu, and there is a way to disable the RF mod
in the set up menu. I double checked it, and its enabled.
I even toggled it for good measure.

This does not sound like a modulator issue, but i am kind of
stumped on this without further information. Anybody got any ideas
on this or have a PDF manual on the HS-U580?

bob