J'en ai fait ce PDF (53 pages) :
Y'a plus qu'à...
♩Non, rien de rien, non, je n'y comprends rien ♫
NB : En bonus, des schémas faits à la mano (dont un concernant le 0950-0408) à lire ici. Et une autre info :
There is +5V generated in two places on the board, one is the print head voltage is fed into 78L05 regulator, the other is a switching regulator that generates the +5V logic voltage, the 9100-0425 pulse transformer is part of that regulator. The output from the logic 5V supply and the output from the 78L05 are compared and the output from that generates an active low power good signal which enables the buffers in the 74LS365 chip and two of the gates on that chip have their inputs tied low and the outputs tied together which turns on the power LED and also enables a few other things.