Panasonic KX-TG8521CAB / KX-TGA850RUB Service Manual ▷ View online
69
KX-TG8521CAB/KX-TGA850RUB
EEP_WP
Lo
w_Rad
LED2
LED1
EEP_WP
CHARGE
eco_mode
SCL2
SD
A2
GND
GND
Q8
C614
1
u
GND
+1.8V
GND
GND
GND
GND
R615
56k F
GND
GND
GND
SA1
L1
33u
L2
33u
GND
J101
GND
GND
+6.5V
GND
GND
GND
R16
10k
GND
GND
GND
GND
R14
100k
GND GND
GND
*C16
K2.2
u
R18
27k
GND
C17
NC
GND
R27
100k
C15
NC
GND
TP10
R116
0
R19
8.2k
R23
100k
+1.8V
GND
GND
GND
GND
GND
C24
NC
C57
NC
GND
GND
R21
12
GND
TP9
C2
3
NC
R28
470k
C56
K0.1
u
C141
NC
GND
GND
C22
1u
C155
NC (1005)
R33 1k
R
3
5
1k
GND
GND
C136
10p
GND
R10
100k
GND
+1.8V
GND
GND
R8
100k
C72
100n
C61 100n
GND
R81
3
.3
k
R117
3
.3
k
+1.8V
C157
1n
TP16
TP15
*C48
NC
*C156
GND
GND
GND
GND
GND
C51
100n
GND
GND
GND
C75
100n
Q4
*D2
3
NC
+3.0V
C84
2.2u
C306
NC
C305
1u
GND
GND
R130
1k
R129
10k
F1 3A
RA402 10k
1
2
2
3
4
*D5
NC
A
K
A
K
A
K
D6
NC
D9
NC
C615
1u
Q9
+2.4V
+2.4V
GND
R106 220
R109
220
R77
10k
NC
GND
C167
NC
VDD2
C7
100n
C8
100n
C65 10p
+2.5_CP
L2T
L1T
L1R
DCM
DCP
L2R
C1
3
7
10p
GND
C
3
2
100
u
16
C27
10
u
50
GND
X1
10.368M
1
3
2
R29
0
ANT1
RF_RXn
RXON
TXON
TXn
TXp
VDD_PADRV
PSEL
PON
ANT2
RF_RXp
GND
C
3
6
33
0
u
10
R657
10k
GND
GND
GND
GND
Q5
C9
680p
C10
680p
RA1
1k
1
2
3
45
6
7
8
C622
NC
*D22
LINE_DC
*R126
3.3k
HAK_CL1
STM
VDD1
C1
NC
C617
1
u
10
C29
NC
C
3
0
NC
C
3
7
NC
R4
1M
R6
1M
R3
180k
R5
180k
GND
*Q22
*R7
*R9
R22
27
C86
1
u
L3
22uH
GND
R91
47
DC_IN
C87
0.1
u
C88
0.01
u
R92
120
VDD3
*D24 NC
*Q23
Q10
D10
C90
NC
R95
680
R93
4.7k
1 ON/*OFF
2
VSS
4
EXT
5
VIN
3 VOUT
*C626
NC
*C6
3
7N
C
R37
3.9k
*C624
1
u
*C62
3
0.1
u
R40 270
C169
10p
C170
10p
*C147
10p
*C148 10p
C168
10p
C74
10p
C70
NC
C171
10p
R15
2.7k
*D26
NC
*R43
4.7M
*C54 33n
*C55
82n
*R36
120k
*C52 820p
*C5
3
820p
*R32 82k
*R
3
4
82k
*C3
680p
*C4
680p
*C5
10n
*C6
10n
*R42
4.7M
*D21
*C42
10n
*C43
10n
C18
NC
D3
4
1
3
2
*C28
0.0
33u
*C25
0.047
u
*D27
NC
*D15
NC
*D16
NC
AA
KK
*R2
NC
*C2
NC
*Q3
*C12
NC
*R17
2.2k
*C166
*R12
3
NC
*R20
2.7k
*C14
0.027
u
*C19
1200p
*R24
47k
1 A0
2 A1
3 A2
4 GND
2 A1
3 A2
4 GND
5
SDA
6
SCL
7
WP
8
VCC
1
VSS_LNA1
2
RF_RXp
21
CIDINp/VREFp
3
RF_RXn
4
VSS_LNA2
5
RFP1
6
RFP0
7
REF_RES
8
AVS_XTAL
22
RINGp/P
3
_7
2
3
RINGn/P
3
_6
24
RINGOUT/RINGING/P
3
_5
25
P
ARADET/P
3
_4
26
ADC0/P
3
_
3
27
ADC1/INT0/P1_0
28
NTC/ADC2
41
CP_C2y
42
CP_VOUT1/LED1
43
CP_VOUT2/LED2
44
PON/P1_6
45
VDD1
46
P2_7/BXTAL
81
GND
9
XTAL2
10
XTAL1
11
AVD_XTAL
12
RF_SUPPLY1
13
LDO_CTRL
14
AVD
15
LSRn
16
LSRp
17
VREFm
18
MICh
19
CIDOUT/MICn
20
CIDINn/MICp
29
SOCp
3
0
SOCn
3
1
CHARGE_CTRL
3
2
P1_7/CHARGE
33
P
A
OUTp/P
3
_1
3
4
VDDP
A
3
5
P
A
OUTn/P
3
_0
3
6
VBA
T1
3
7
CP_C1x
3
8
CP_C2x
3
9
CP_C1y
40
VBA
T2
47
P1_5/INT5/RDI/VDDE
48
P1_4/INT4/TDOD
49
P1_3/INT3/SIO
50
P1_2/INT2/SK
51
P1_1/INT1/LE
52
P2_6/WTF_IN
53
P0_7/SPI_DI
54
P0_6/SPI_DO
55
P0_5/SPI_CLK
56
P0_4/SPI_EN
57
P0_3/SCL2
58
P0_2/SDA2
59
P0_1/URX
60
P0_0/UTX
61
RSTn
62
JT
A
G
6
3
P2_5/PCM_FSC/SF
64
P2_4/SCL1/PCM_DO/DP
3
65
P2_
3
/SD
A1/PCM_DI/DP2
66
P2_2/PCM_CLK/CLK100
67
P2_1/ECZ2/PWM1/LED4
68
P2_0/ECZ1/PWM0/LED
3
69
VDD2
70
LDORF_CTRL
71
RF_SUPPL
Y2
72
RFP0n
7
3
RFP4
76
VSS_P
ADR1
79
VSS_P
ADR2
77
RF_TXp
80
RFP2
75
VDD_P
ADR
78
RF_TXn
74
RFP
3
*Q2
*R124
10
*R12
10k
*R13 680k
*R30
470
*R
3
1
470
*R55
5.6
*R56
5.6
*R57
0
*C49
470p
DC_IN
Charge -
Charge +
TO RF BLOCK
TG85/55xx only
Charge -
Charge +
NC
NC
NC
NC
NC
NC
NC
1.8V
3.0V
TX _RF
RX _RF
TX _AF
Bell signal
Caller ID
0.75V
0V
250mVp-p
Loop Current
Charge
Current
Current
RX_AF
Bell signal
*IC401
IC2
IC3
*IC7
KX-TG8521CA SCHEMATIC DIAGRAM (Base Unit)
NC: No Components
(1)
(2)
(3)
(4)
(5)
(7)
(6)
(8)
(9)
70
KX-TG8521CAB/KX-TGA850RUB
13.3. Schematic Diagram (Base Unit_Operation)
KX-TG8521 SCHEMATIC DIAGRAM (Base Unit_Operation)
NC: No Components
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
ANS1
STOP
ERASE
MSG2
MSG1
RPT
SKIP
UP
DOWN
LOCAT/INT
MEG_LED
KEYIN2
KEYS_B
ANS_LED
KEYS_E
KEYS_C
KEYIN1
2APVCC
KEYIN3
KEYS_D
LED902
RED
A
A
K
*LED901
RED
A
A
K
*LED903
NC
A
K
71
KX-TG8521CAB/KX-TGA850RUB
Memo
72
KX-TG8521CAB/KX-TGA850RUB
13.4. Schematic Diagram (Handset)
URX
KIN_2
STB_D
KIN_1
KIN_4
KIN_3
STB_B
STB_D
EEP_SDA
KIN_4
UTX
EEP_WP
HEADSET_DET
HEADSET_DET
LCD_RESET
LCD_SID
LCD_SCL
LCD_SCL
LCD_CS
KIN_1
LCD_CD
CHG_DET
CHG_CTRL
STB_C
CHG_CUR
EEP_SCL
KIN_2
KIN_3
KIN_3
KEY_LED
BELL_LED
STB_A
STB_C
CHG_CUR
EEP_SDA
EEP_SCL
EEP_SCL
CHG_DET
CHG_CTRL
LCD_CS
LCD_RESET
STB_E
CHG_DET
KIN_5
CP_CTRL
LCD_CONTRAST
CP_OFF
BELL_LED
KEY_LED
CP_OFF
UTX
LCD_CD
LCD_SCL
CP_CTRL
EEP_WP
STB_E
URX
STB_B
STB_A
LCD_CONTRAST
KIN_5
LCD_SID
R45
0.1
VBAT
GND
F1
5.6n
C121
NC
GND
GND
GND
GND
GND
GND
GND
R152
0
0
C43
K0.1u
GND
GND
GND
C41 k0.1u
Q4
C11
K0.1u
C13
K0.1u
RA4
3.3k
GND
L4
NC
L5
NC
C7
NC
R2
NC
R6
1k
C147
NC
GND
C5
K0.1u
GND
LED12
GND
CHG(+)
C184
D10p
VDDC
C64
NC
C65
NC
R64
2.2k
GND
GND
GND
GND
4.0V
GND
GNDA
VDDC
VBAT
3.0V
C40
k0.1u
GND
C25
K2.2u
C22
k0.1u
VBAT
R23
10
GND
GND
R4
47k
C45
K0.1u
C10
NC
GNDA
GNDA
VBAT
D1
( )
Q6
3.0V
3.0V
3.0V
3.0V
3.0V
VBAT
ATSTP
ATSTN
GND
URX
GND
Q21
3.0V
GND
C19
NC
GND
RXn
TXn
TXp
TXp
RXON
RXp
TXON
GND
R21
100k
GND
D2
NC
TE
E_WP
RSTN
CHG_CTRL
CHG_DET
E_SDA
TEST
E_SCL
CHG(-)
UTX
R16
NC
C33
0.1u
C36
0.1u
C34
NC
C35
NC
GND
GND
VBAT
CHG_CUR
VBAT_MON
R26
3.3k
GNDA
C183
D10p
C21
1u
C29
1u
C31
1u
C172
0.1u
C188
1u
1u
C150
NC
C3
NC
C32
1u
BATT+
BATT-
R30
100k
GND
C24
1u
C23
0.1u
Q5
GND
R66
10k
R67
10k
R68
10k
R69
10k
GND
VREF
4.0V
R507
0
0
R506
NC
C17
10p
C18
10p
RA5
10k
1
2
3
4
5
6
7
8
1
GPIO[20]
2
GPIO[21]
23
MIP
3
GPIO[22]
4
GPIO[23]
5
GPIO[24]
6
GPIO[25]
7
GPIO[26]
8
VDDC2
24
HSMIN
25
HSMIP
26
MPWR
27
HSSPOUTP
28
LOUT
29
SPOUTN
30
VCCPA
45
TXp
46
RXp
47
RXn
48
GND_RF
49
TRSW_p
50
ANT_n
51
ATST_n
52
ATST_p
81
GPIO[13]
82
GPIO[14]
83
GPIO[15]
84
GPIO[16]
85
GPIO[17]
86
VDDIO2
87
GPIO[18]
88
GPIO[19]
89
GND
9
COREOUT
10
VBAT
11
DOUBCAPN1
12
DOUBCAPN
13
DOUBCAPP
14
DOUBCAPP1
15
DOUBOUT
16
DCIN0/LIN0
17
DCIN1
18
DCIN2
19
DCIN3/LIN1
20
VREF
21
VCCA
22
MIN
31
SPOUTP
32
PWM1
33
PWM0
34
DCINS
35
XOUT
36
XIN
37
VBAT_APU
38
VDD_APU
39
VCC_IF
40
VDD_IF
41
VCC_FE
42
ANT
43
TRSW_n
44
TXn
53
TEST
54
RSTN
55
NC
56
VCC_VCO
57
GPIO[27]
58
VDDUSB
59
DM_USB/GPI28
60
DP_USB/GPI29
61
VDDC1
62
JTAG_TDO
63
JTAG_TDI
64
JTAG_TCK
65
JTAG_TMS
66
JTAG_RTCK
67
GPIO[0]/SCL_IIC
68
GPIO[1]/SDA_IIC
69
GPIO[2]
70
GPIO[3]
71
GPIO[4]
72
GPIO[5]
73
GPIO[6]
74
GPIO[7]
75
GPIO[8]
76
VDDIO1
77
GPIO[9]
78
GPIO[10]
79
GPIO[11]
80
GPIO[12]
Q9
CKM/STM
VBG
VDDC
3.0V
VBAT
WLED
+
-
R3
1.5k
C77 D10p
C76
D10p
GND
GND
4.0V
GND
GND
GND
R8
NC
GND
TCK
TDI
TMS
TDO
GND_J
4.0V_IC
VBAT
4.0V_IC
GND
D7
GND
C56
1u
C57
1u
R17
10k
R18
NC
R12
NC
GND
R5
47k
C46 10p
C30
10u
C26
K10u
C51
10u
C20
10u
*
DOWN
1
6
MENU
3
UP
RIGHT
4
5
SP
TALK
SOFT2
LEFT
9
SHARP
2
0
FLASH
8
OFF
SOFT1
7
C100
K1u
25V
C106
NC
CN3
4
4
V0
CN3
12
Vcc
R50
3.3k
3.3k
C105
NC
CN3
7
7
Vcc
C102
K1u
16V
CN3
1
1
Vss
CN3
13
RS(A0)
CN3
15
Vcc
CN3
2
2
Vg
C27
K1u
CN3
10
IF1/IF2
C103
NC
CN3
5
5
Vcc
R54
10k
CN3
8
8
/CS
R55
1k
CN3
16
SCL
CN3
14
SI
C28
NC
CN3
18
Vss
CN3
3
3
XV0
C104
NC
CN3
11
RST
CN3
6
6
Vss
GND
CN3
9
9
IF3
C107
NC
CN3
17
Vm
C101
K1u
16V
CHG+
CHG-
3.0V
2.3V
LED2
LED6
LED5
LED1
LED3
LED4
R509
470
Q8
R14
NC
WLED+
WLED-
C342
( )
GND
C340
( )
GND
C341
( )
GND
128k
1
A0
2
A1
3
A2
4
GND
5
SDA
6
SCL
7
WP
8
VCC
C343
39p
GND
1
VOUT
2
GND
4
CN
5
VCC
3
SHD
6
CP
C1
NC
C2
680u 6.3
R80
0
R81
NC
C81
J100p
J100p
GND
C79
J100p
GND
C200
J100p
GND
C16
0.039u
C50
K2.2u
Q50
L6
1u
1u
C58
K10u
R56
5.6k
5.6k
Q51
4.0V
4.0V
Q60
R53
1k
R57
2.2k
R51
330
R58
680
R52
330
R59
680
C52
NC
C138
10p
R33
100k
R31
100k
C15
39p
L29
120
C4
39p
C80
39p
39p
C78
10p
GND
C84
10p
GND
C44
1u
RA3
270
1
23
4
R70
120
120
R7
100k
R15
220k
D30
R400 100k
C400
K0.01u
R350
100k
C350
NC
GND
RA2
270
1
2
3
4
5
6
7
8
R561
220
To Charge
Terminal
Terminal
To Battery
KEY BACKLIGHT
(Blue)
(Blue)
BELL LED
(Amber)
(Amber)
LCD_BACKLIGHT
(White)
(White)
(POWER)
TO RF BLOCK
FLASH:1.8V / ROM:1.2V
To Color LCD Unit
NC: No Components
IC1
IC3
IC4
(1)
(2)
(3)
(4)
(6)
(5)
(8)
(9)
(10)
(11)
(12)
(7)
Charge Current
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