Looking for Atari SC1224 monitor schematic

Hi Everybody, Picked up another 520ST (same flea market as 1050 drive) - it's a later edition as it has the power supply and floppy drive built in like my 1040ST. My other 520ST requires an external floppy and drive. Anyway, the machine itself works fine, however the Atari SC1224 monitor that came with it does not. I can hear it "chirp" when I throw the switch, suggesting that the horizontal oscilator is running, however I never get any light on the screen - no apparent "static bristle", so there may be no HV, but I can't tell for sure haven't opened it yet. Anyone got a set of schematics for the SC1224? Btw, does anyone know if the internal floppy drive of a 520ST is a single-sided drive like the external SF354 drive? Or a double sided drive like is in the 1040ST? Thanks, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector.