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FO-4500H
6. Rectifying/smoothening circuit (VM (+24V))
The high-frequency pulse produced in the inverter circuit is dropped
by the converter transformer T701, is rectified by the high-frequency
diode D707 and is moreover smoothened by C715 and R716.
B
D707
A
C
C715
C716
Fig. 19
VOLTAGE
A
–
B
WAVEFORE
0
24V
VOLTAGE
A
–
C
WAVEFORE
0
Fig. 20
7. 3-terminal regulator circuit (+12V system)
It is also called the dropper system. VM system (+24V) is dropped to
+12V with IC704 for stabilization. Moreover, the overcurrent protective
circuit is a IC integrated type with the characteristic of "#" letter.
VM
(+24V)
MG
8. Chopper circuit (+5V system)
The output voltage detected by R723 and R724 is input into the air
amplifier by IC703, and is passed through the PWM comparator for
PWA control of the output transistor in order to stabilize the output
voltage. The oscillating frequency is set at approx. 100 kHz with the
integrated oscillator. Moreover, the overcurrent-protective circuit is an
IC integrated type to drop the output for the overcurrent.
IC703
ISW
VM
(+24V)
A
B
MG
5 – 26
IC704
Fig. 21
0V
• IC703
A → C
+5V
WAVEFORE
R723
D709
R724
• IC703
ISW WAVE
DG
FORE
0V
Fig. 22
+12V
AG
OFF ON
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