KX-TC1800B - Panasonic Telephone Service Manual (repair manual). Page 41

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21 BLOCK DIAGRAM (Handset)
BATT
RESET
MCLK
VBAT
RXIF
TXEN
RXEN
TXI
TXQ
PN
SDATA
RF BLOCK
DVCC
AVCC
RESET
BASEBAND IC
CHARGE
RINGER
AIN
AON
SDOUT SDIN
OSCENA
3.0V
REG
CHARGE
DET
RINGER
CONTROL
MIC-AMP
RINGER
MIC
SPEAKER
TO LCD UNIT 
(CALLER ID)
EEPROM
KEY
PAD
TALK
LED
LED
21.4MHz
OSC
41
KX-TC1800B
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