Note. IIRC both the yoke & 9-90 boards are interlocks for the
130 V line. This varied over the yrs.
SW201 is probably the service switch. On main chassis.
Kills both video & vert to set grey scale.
Many small parts were the same from B line sets to L line sets,
apx 11 yrs. Millions were sold, probably more than any other color world wide.
Zeno
