(1) When DC input power is connected to the
5-4. Functional Description of Inverter Drive Circuit
system, the resulting +10- to +12-volt input is reduced by
Board A1A2 (1974 Model Only)
the dc power supply to a regulated +5 vdc. The oscillator
(fig. 5-2.1 and FO-2.1)
provides a 15.36 kHz signal that is divided down to 60 Hz
a. General. The inverter drive circuit board contains
by the frequency divider. This 60-Hz signal operates the
11 functional circuits (b through I below).
SCR driver circuit which provides gate drive to the power
SCR's (not on the circuit board).