Power Supply Board Section - Panasonic KX-FG2452CX Service Manual

6.13. Power Supply Board Section

This power supply board uses the switching regulator method.
AC
Input
Input
Circuit
A-B Voltage Wave Form
0
C-D Voltage Wave Form
0
E-F
G-H Voltage Wave Form
0
[Input Circuit]
The input current goes into the input rectifier circuit through the filter circuit. The filter circuit decreases the noise voltage and the
noise electric field strength.
[Rectifier Circuit]
The input current is rectified by D101, D102, D103 and D104 and charges C106 to make DC voltage. Then it supplies power to
the converter circuit.
[Kick-on voltage circuit]
Bias is applied to the Q101 gate via this circuit when the AC power is turned on and Q101 begins operating.
A
Rectifier
+
C106
Circuit
-
D110
B
R104
Kick-on
Voltage
Circuit
Block Diagram
Surge
Absorber
Converter Circuit
Circuit
C
Q101
Surge
Absorber
D
Circuit
Control
Circuit
IC101
49
G
24V
Output
Circuit
4V
Output
Circuit
E
H
F
Error Detecting
Circuit
KX-FG2452CX
24V
GND
4V
9~6V