Panasonic KX-FT21BX

- 162 -
KX-FT21LA KX-FT21LA
12
3456
7
8 9 10 11 12
G
F
E
D
C
B
A
H
SCHEMATIC DIAGRAM (SWITCHING POWER SUPPLY)
Note:
When measuring the waveform on the primary circuit of the Switch Power Supply Board, be sure
to insulate the ground of the oscilloscope's probe from the ground of its power supply.
D102
C102 0.1
Q102
D107
C110
682
R108
100K
R107
100/2
R106
100/2
R110
D202
IC202
D106
PC101
22
C109
0.01
R223
100
C205
1/50
CN301
1
2
3
4
5
6
7
8
24V
24V
24V
GND
GND
GND
5V
GND
C202
D201
T101
TRANS
1000p
R105
G
D
S
Q101
10
R109 D105
*(5.1K)
C103
L101
R113 R112 R111
330K 330K 330K
C101
0.1
GND
F101
5A125V
CN31
12LN
C104
2200p 2200p
C105
220pF
C106
R102 220K
R103 220K
C107 330p
R101 5.6/2
680/2 R205
C201
D204
470/35
680/2 R206
C207 47/35
C203
470/16
R104
15K
R222 4.7K
R221
680
R221
2.2K
R224
22K
R225
Q201D203
12K
VR201
5K
PC101
180/200
D101
D103 D104
ZNR102
ZNR101
470V
470V
Cycle=2.2 s
Cycle=2.2 s
5V
300V
0V
Cycle=2.2 s
Cycle=2.2 s
25.5V 10V
0V
14V
-35V
0V
-0.8V
0V