1972 Motorola CRT Monitor - Losing Focus

[MightyFrame]

Originally Posted by zeno

Start by checking the 87 volt supply. Schematic is fuzzy but it
looks to come from C25 & D5. C25 most likely & is a very common
fail on almost any solid state TV. Part of the problem may be the CRT
also but CRT's usually get better as they warm up.

Zeno, thank you for this pointer. I just checked this point on the schematic, and it reads 103v DC.

I take it this is higher than it should be, because you say it should be 87v?

Could this be the CRT overdriving now?

Thank you again!
Best,
AJ