Panasonic KX-FT21BX Service Manual page 137

POWER SUPPLY
AC120V
REG
+24V +5V
+24V +5V
MOS SW REG
5V
RESET
PRINTER
CONTROL
I/O
A/D
General Block Diagram
OPERATION PANEL
SELE
CTOR
KEY MATRIX
3.3V
SRAM ROM
256k 1M
CODEC
OP PANEL
CPU
OSC
I/F
I/F
ASIC
ROM
MODEM
IMAGE
PROCESSING MOTOR I/F
RTC
SENSOR MOTOR
LCD
SENSOR
DIGITAL BOARD
+24V
+5V
ANA
LOG
SW
VOL
SP MUTE
SP
AMP
SPEAKER
ANALOG BOARD
BELL PC
HOOK SW
HOOK
PAPER
PAPER
HANDSET
LINE
EXT.
TEL