Fig. 3-23 1/4 "Zero-Cross" Waveforms - Canon NP-70 Service Manual

NP -70
3-61
24VAC
Q233 Base
Voltage
Q233
Conduction
~~
Charge
Voltage
TP231 3N4
Voltage
Heater
Voltage
Fig. 3-23 depicts the waveforms for the operation of the 1/4 zero-cross circuit.
Bias voltage
of Q233
I
I
I
OFF
I
I
I - E Charging ~I ~ Charging
I
I
I
I
I
~~~
i"~ i" - ~
/
\
/
\\
i ~
\~
s
~ \
/ ~ / \
~ ~
I
~
Fig. 3-23 1/4 `Zero-Cross" Waveforms
Second Printing-June, 1974