Tektronix 2430 - Page 128

4917-15
Figure 3-16. PWM switching waveforms.
04 2 1 AND 04 23
PUL SES GET WIDER
AS THE SOFT STAR T
VOLTAGE RISES
NORMAL
OPERAT ION
PWR -.t-.t---- SOFT
OFF START
3-94
Q721 DRIVE
Q521 DRIVE
Q423 DRIVE
Q421 DRIVE
OSCILLATOR
U233 -5
SOFT START
U233-8
CONTROL
POWER SUPPLY
U233-15
Theory of Operation-2430 Service