I just did my first successful alignment of a Sansui 1000X. Now I'm trying an Onkyo 4500 but I'm having trouble on the first step. Can someone give me a hint? I aligned the Sansui on my ST-1000A and never tried to display the S-curve. The ST-1000A produces a display that looks more like a loaf of bread. I haven't been able to get anything approaching the classic S-curve I've heard so much about. I'd love some more detail here. I've got a nice sweep generator but unsure how to set it up. 10.7 MHz +/- 200 Hz at .1 mV is my best guess. I have the signal generator connected to a 50 ohm terminator, then to an alligator clip on the IF pin of the tuner board (upper left on the schematic). The oscilloscope is clipped onto R111 near Q124 (bottom rightish on the schematic) Here is the input on the board. Here is the output on the board just past the quadrature detector. I'm guessing that this arrangement of capacitor and resistor is basically a time constant to give me a Smooth S-curve output rather than a sinusoidal output of varying amplitude? One margarita down, probably several more to go. This is the Z output from the back of the signal generator that synchronizes to the sweep. I'm thinking that I have to trigger off this signal, then display the quadrature output in the vertical axis. I've played with XY mode and other combinations of scope settings with no luck.