Help resurrect my Xerox Alto

Mea clupa! You are absolutely correct, of course. This will teach me to quickly glance at schematics and not fully analyse them. I looked at the monitor scheamtic and saw the horizontal system had half adozen transistors in it, and what looked to be timing networks. So I assumed, incorrectly, that it was an oscillator. I failed to notice there was no feedback path anywhere. To the OP : I posted some incorrect information yesterday. The Alto monitor, at least if it's the Ball Brothers one shown in the schematics on bitsavers, will _NOT_ produce the high voltages (including the CRT anode voltage) unless it is getting horizontal sync pulsse ('drive pulses' is probably more accurate) from the Alto itself. I don't know enough about the Alto to know if it will always proeduce such sync pulses, or whether you have to have the right software or microcode loadrd. I thnik what I would do, given that you have a 'scope, is to see if the Alto is producing said horizontal sync pulses. If not, then figure out why (it may not be a hardware problem, I can take a look at the Alto video scehamtics to see if I can figrue out if there's any software control). When you arr getting sync pulses, then troubleshoot the monitor. -tony