HP9836C colour alignment (grey scale tracking)

[HP's odd designs] That reminds me, in passing, of the HP98x0. The 'service manuals' are boardswapper guides with PSU schematics only. But HP patented the machines, and the patents (I have a list of the numbers, I think they're also on Eric Smith's site) are several hundred pages each, and include such interesting things as schematics (albeit of pre-production machines), interface schematics, the machine language instruction set, ROM sources (sysrem firmware and many of the expansion ROMs, etc). In other words what _should_ have been in the service manual... [...] I will emphasise that again. The best tools/test equipment/CAD system/whatever are no use at all unless you think about what you are doing and use them intellegently. They're not generic, in that they don't fit more than 1 types of TV/monitor, but they're not really OEM parts, in that I suspect the original flyback came from a different supplier. I suspect in some cases the original was reverse-engineered and said third-party company came up with a functional equivalent. It's only worth their while to do this if they are likely to sell many of them, of course, so the HP9836C is not going to be on the list... I must admit I've never had any success with these third-party flybacks. I had an Amstrad VGA monitor with flyback trouble (the voltage divider block for the focus and A1 supply was reaking down), I ordered the so-called replacement and fortunately I checked out the winding connections before fitting it (that is, I checked which pins were connected by windings, which sets were totally isolated). I say fortunately, because if I'd fitted it, the 100V or so output from the monitor's SMPUS would have been directly connected to the CRT heater!. In the end Iought the genuine Amstrad part (yes, it was available, it was also a lot more expensive) and had no prolems. -tony