KX-TG8521RUB, KX-TG8522RUB, KX-TGA850RUB - Panasonic Telephone Service Manual (repair manual). Page 11

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11
KX-TG8521RUB/KX-TG8522RUB/KX-TGA850RUB
4.3.
Block Diagram (Handset)
IC1
IC3
MIP
MIN
HSSPOUTP
LOUT
BELL_LED
LCD_CONTRAST
HSMIP
HEADSET_DET
SPOUTP
SPOUTN
CKM//STM
CKM/STM
BBIC
RESET
CHG_CTL
CHG_DET
WP, SCL, SDA
KEYSTOROBE_A~E
KEYIN_1~5
CHARGE
Q4
D7
MIC
Receiver
Headset Jack
CN431
LED
Monitor SP
LCD
CHARGE 
PUMP
IC4
KEYS
RF part
ANT1
X1
13.824 MHz
EEPROM
VBAT
BATTERY
Q5
Q8
LED
(LCD)
RSTN
(BELL)
VBAT
VBAT
3V
4V
4.0V
VBAT
RXn
RXp
RXON
TXp
TXn
TXON
KX-TGA850 BLOCK DIAGRAM (Handset)
KEY_LED
CP_OFF
Q6
LED
(KEY)
4V
46
36
35
34
32
54
23
22
27
28
25
70
7
72, 74, 75,
77, 78
85, 87, 2, 3, 4
79, 80, 81, 82, 83
6
84
31
29
57
67, 68, 69
47
49
45
44
43
R70
R509
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