> > Should I leave well enough alone, or is there preventative maintenance that > should be done? For instance, should capacitors be proactively replaced. In > general, I'm thinking about things that, if they fail catastrophically, > would cause collateral damage.
The main part you want to protect is the flyback transformer. It is very hard to get a good replacement now. Flybacks can just fail, but failure can be caused by defective diodes and capactors on the video PCB. Look at the schematics for your video board (there are at least 3 versions) for half-wave rectifier circuits that produce the CRT and video stage supply voltages from the flyback. You might want to check or replace those diodes and caps. A VT100 and models derived from it (VT105, etc) has an SMPSU. Defective capacitors on that can kill the chopper transistor, but that is in not impossible to replace. -tony
