HP 19C big print font size

[tangdfx]

Thank you tony.

Today I find that this HP19 draw unnormal current.
I think there must be something wrong with the P SU board.
Maybe some where has short circuit.

So I want to learn from bernhard to rebuild the PSU with new component.
And use the fixed resistance 25k and 100k to replace the 50k and 200k Potentiometer pot. I also doubt that the transistor is failed.