Panasonic KX-NT553RU-B / KX-NT556RU-B Service Manual ▷ View online
49
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
6
5
8
7
A
B
C
K
X
-NT553
58
/ K
X
-NT55
6
58
M
A
IN BO
A
RD No.1
RE
S
ETOUT
R
X
RD
Y
U
S
B1_CTRL/TR
A
CE_D[
6
]
U
S
B1_DET/TR
A
CE_D[5]
MLCD_
A
0
MLCD_C
S
I2
C1_
S
D
A
I2
C1_
S
CLK
AS
IC_CLK
LCD_CLK
LCD_CLK
LCD_D0
LCD_D0
MLCD_
A
0
MLCD_C
S
MLCD_R
S
T
U
S
B1
V
BU
S
DGND
R51
6
1M
V
DD1
2V
C5
2
5
0.1u
10
C5
2
8
10p
50
C5
2
91
2
p
50
X
501
2
5M
1
2
4
3
R515
4
7
0
R513
1M
V
DD1
2V
C5
2
4
0.1u
10
DGND
E_T
X
CLK
00
2
:3
A
R509
100
E_T
X
D[
2
]
00
2
:3
A
E_T
X
D[0]
00
2
:3
A
E_T
X
D[1]
00
2
:3
A
R50
6
10
0
1
2
3
4
5
6
7
8
E_T
X
D[3]
00
2
:3
A
R508
100
E_MDIO
00
2
:1C
E_MDCLK
00
2
:1C
R50
7
100
E_R
X
D
V
00
2
:3
A
E_R
X
CLK
00
2
:3
A
E_R
X
D[0]
00
2
:3
A
E_R
X
D[1]
00
2
:3
A
E_R
X
D[
2
]
00
2
:3
A
E_R
X
D[3]
00
2
:3
A
V
DD33
V
V
DD33
V
V
DD1
2V
CL
6
15
ETE
S
T
TE
S
T
L50
2
C55
6
1u
CN50
2
1
E
S
D-
VSS
2
S
CL
3
S
D
A
4
A
0
5
6
/C
S
7
8
V
D1
9
VSS
10
11
1
2
V
O
13
XV
O
14
V
G
15
E
S
D-
VSS
C545
1u 10
C558
1u
16
C559
1u
D501
C557
1u
DGND
DGND
R
X
RD
Y
001:
7
E
RE
S
ETOUT
001:
7
E
U
S
B1_CTRL/TR
A
CE_D[
6
]
001:
2
E
E_CR
S
00
2
:4
A
R5
6
4
1
k
V
DD33
V
R5
6
3
1
k
R5
6
54
7
0
S
PI
2
DI
001:
7
E
S
PI
2
CK
001:
7
E
S
PI
2
DO
001:
7
E
R54
6
4
7k
1
R541
100
DGND
R540
NC
DGND
E_T
X
EN
00
2
:3
A
DGND
R54
8
10
0
1
2
3
4
5
6
7
8
IC50
2
U9
KE
Y
_COL0
T9
KE
Y
_COL1
R4
MDIO
W9
KE
Y
_COL
2
N4
MDC
V
9
KE
Y
_COL3
T3
MIICOL/U
2R
X
T10
KE
Y
_COL4
R
2
MIICR
S
_D
V
/RGMIIR
X
_CTL
R10
KE
Y
_COL5
T
2
P
7
KE
Y
_COL
6
W
7
KE
Y
_COL
7/
S
PI
2C
S
R1
MIIR
X
CK/RGMIIR
X
C
T8
KE
Y
_ROW0
U
2
MIIT
X
D0/RGMIITD0
U8
KE
Y
_ROW1
U1
MIIT
X
D1/RGMIITD1
W8
KE
Y
_ROW
2
V2
MIIT
X
D
2/RGMIITD
2
R9
KE
Y
_ROW3
V
1
MIIT
X
D3/RGMIITD3
V
8
KE
Y
_ROW4
T1
V
10
KE
Y
_ROW5
N3
MII_T
X
ER/
S
PI1C
S
1
U10
R3
MIIR
X
D0/RGMIIRD0
P10
P1
MIIR
X
D1/RGMIIRD1
P9
KE
Y
_ROW8
P3
MIIR
X
D
2/RGMIIRD
2
P8
KE
Y
_ROW9
P5
W1
U
S
B
2N
W
2
U
S
B
2P
P
6
U
S
B1
V
BU
S
N
6
U
S
B1
V
RE
S
N5
M
6
U11
U3
U
S
B1N
V
3
U
S
B1P
M5
V
CC_U
S
B
2
T11
R11
P11
U1CT
S
/DIGMIC_D
A
TA
R1
2
F14
G14
E15
E1
7
D18
D1
7
C19
F1
7
E18
D19
F15
V
11
S
D_D0
W11
W10
F18
TR
S
T
H15
TM
S
H1
6
TDO
G1
6
TDI
G15
TCK
M
7
N
7
W4
X
O1
2M
W3
X
I1
2M
J
1
2
J
13
F19
X
O
25M
E19
X
I2
5M
G19
M
A
IN_CLK_OU
T
F1
6
TE
S
T
H14
ETE
S
T
E1
2
E_
V
DD
Q
P1
2
DGPIO31
N11
DGPIO30
R
7
V7
E
X
TINT
2/CLK_OUT
R8
E
X
TINT1/IIC1
S
CL
U
7
E
X
TINT0/IIC1
S
D
A
L5
V
DDIO_RGMII
P4
MIIR
X
CR
S
/U
2T
X
P
2
MIIR
X
D3/RGMIIRD3
N
2
MIIR
X
ER/E
X
TINT1
2
R5
62
4.
7k
R55
6
4.
7k
V
DD33
V
C543
22u
6.3
R519
4
7
R545
4.
7k
2
5MOUT
00
2
:1C
R518
0
R5
2
10
DGND
CL
6
19
L50
6
R533
22
0
R53
6
100
L50
7
U
S
B1N
001:
2
F
U
S
B1P
001:
2
F
X
50
2
1
2
M
C546
NC
OPE_33
V
JA
BR
A
_R
X
001:4E
JA
BR
A
_T
X
001:4E
TCK
TDI
TDO
TM
S
TR
S
T
C541
NC
DGND
U
S
B
2
N
U
S
B
2
P
R51
2
4.
7k
DGND
T1
SS
CL
K
U
S
B1_DET/TR
A
CE_D[5]
001:
2
F
U
S
B1
V
BU
S
001:
2
F
R589
4.
7k
R5
67
33
R5
6
83
3
L503
0
L504
0
C53
2
18p
50
C533
18p
50
0:NOR FL
AS
H
1:
A
ccordin
g
to
Boot str
a
p
0:50 MH
z
1:
2
5 MH
z
0: CLK_M
A
IN_CLK
1: IF_CLK_PLL
PCB RE1
O
S
C
25M_
V
DD1
2
O
S
C
25M_
VSS
O
S
C1
2M_
V
DD1
2
O
S
C1
2M_
VSS
MIIT
X
EN/RGMIIT
X
_CTL
KE
Y
_ROW
6/IIC
2S
CL
KE
Y
_ROW
7/IIC
2S
D
A
V
DD
A
_U
S
B1
V
DDL_U
S
B1
E
X
TINT8/DR
V
_V
BU
S
U1T
X
U1R
X
U1RT
S
/DIGMIC_CLK
S
PI1C
S
0
S
PI1DI
S
PI1CK
S
PI1DO
S
PI
2CK
S
PI
2DI
S
PI
2DO
T1
S
CLK
F1
SY
NC
D1R
X
D1T
X
S
D_CMD
S
D_CLK
E
X
TINT3/CLK_REF_OUT
U
S
B1ID
MIIREFCK/RGMIIT
X
C
To M
a
in LCD
DGND
V
DD1
/RE
S
V
DD
A
V
M
(19)
(18)
(1
(1
7)
(1
6)
(15
(14)
(14)
(13)
(1
(1
2)
(11)
(2
)
(5)
(3)
50
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
DDR_ODT0
NFLD[0]
NFLD[1]
NFLD[
2
]
NFLD[3]
NFLD[4]
NFLD[5]
NFLD[
6
]
NFLD[
7
]
NFLRD
NFLCLE
NFLRE
A
D
Y
NFLC
S
0
NFL
A
LE
NFLD[0]
NFLD[1]
NFLD[
2
]
NFLD[3]
NFLD[4]
NFLD[5]
NFLD[
6
]
NFLD[
7
]
AS
IC_CLK
I2
C1_
S
D
A
I2
C1_
S
CLK
NFLWR
DGND
C519 0.1u
DGND
V
DDIO_DDR
C515
0.1u
C52
1
0.1u
DGND
C517
0.1u
C516
0.1u
C52
0
0.1u
C514
0.1u
10
R503
10
k
DGND
R504
0
R505
0
V
DD33
V
C56
1
22u
6.3
C585
0.1u
10
R52
9
NC
DGND
V
DD33
V
L505
DGND
C584
100p
50
C583
100p
50
C58
2
0.1u
10
DGND
R52
8
4.7k
R526
4.7k
R52
5
NC
R52
4
NC
DGND
DGND
C586
0.01u
25
U
S
B1_DET/TR
A
CE_D[5]
001:8B
IC504
1
NC1
2
NC
2
4
6
NC
27
4
7
NC
2
8
3
NC3
48
NC
2
9
4
NC4
45
NC
26
5
NC5
44
I/O
7
6
NC
6
43
I/O
6
7
R/*B
4
2
I/O5
8
*RE
41
I/O4
9
*CE
40
NC
2
5
10
NC
7
39
NC
2
4
11
NC8
38
NC
2
3
1
2
V
CC1
3
7
V
CC
2
13
VSS
1
3
6
VSS2
14
NC9
35
NC
22
15
NC10
34
NC
2
1
1
6
CLE
33
NC
2
0
1
7
A
LE
3
2
I/O3
18
*WE
31
I/O
2
19
*WP
30
I/O1
2
0
NC11
2
9
I/O0
2
1
NC1
2
2
8
NC19
22
NC13
27
NC18
2
3
NC14
26
NC1
7
2
4
NC15
2
5
NC1
6
C4
DDR_RTT
A
1
2
DDRODT0
C11
DDRODT1
C18
DDR_REF0
A
11
DDR_REF1
A
4
DDR_REF
2
E
7
V
DDIO_DDR1
E10
V
DDIO_DDR
2
F5
V
DDIO_DDR3
F
6
V
DDIO_DDR4
F
7
V
DDIO_DDR5
F8
V
DDIO_DDR
6
F9
V
DDIO_DDR
7
F10
V
DDIO_DDR8
G11
V
DDIO_DDR9
N8
R
6
W
6
NFLD
6
/Q
C
S
1
T
7
NFLD5/
Q
C
S
0
T
6
NFLD4/
Q
D
Q
3
V
4
NFLD3/
Q
D
Q2
V6
NFLD
2
/Q
D
Q
1
U
6
NFLD1/
Q
D
Q
0
W5
NFLD0/
Q
CLK
CL501
CL50
2
CL503
R534
NC
R535
NC
CN501
1
2
3
4
5
6
7
8
9
10
11
1
2
13
14
C527
1000p
C526
0.1u
HE
A
D
S
ET_IN
004:
2
D
HE
A
D
S
ET_OUT
004:
2
D
OPE_33
V
DGND
U
S
B1P
001:8C
U
S
B1N
001:8B
R531
33
R54
2
33
CL504
A
GND
L501
CL505
CL508
CL50
6
CL50
7
JA
BR
A
_R
X
001:
7
C
JA
BR
A
_T
X
001:
7
C
L509
5
V
DGND
R5
76
300
DGND
R539
NC
R577
NC
DGND
5
V
U
S
B1_CTRL/TR
A
CE_D[
6
]
001:8B
R585
NC
DGND
DGND
U
S
B1
V
BU
S
001:8B
R53
7
NC
C544
1u
DGND
C547
1u
DGND
R538
100
DGND
C550
1000p
C551
1000p
DGND
R558
NC
R586
0
DGND
R58
7
100
1
2
3
4
5
6
7
8
DGND
R588
100
1
2
3
4
5
6
7
8
C548
330p
C549
330p
U
S
B Port
for Test
m
ode
To Oper
a
tion PCB
NFLD
7/MEM
XA2
1
V
DDIO_NFL
QS
PI
(10)
(9)
(8)
(7
)
(6
)
(5)
(4)
(3)
(2
)
(1)
(2
4)
(2
3)
(22
)
(2
1)
(2
0)
3/4
E
D
F
3
2
1
4
K
X
-NT553
58
/ K
X
-NT55
6
58
M
A
IN BO
A
RD No.1 3/4
(4)
(10)
(7
)
51
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
S
LCD_C
S
S
LCD_
A
0
LCD_CLK
LCD_D0
S
LCD_C
S
S
LCD_
A
0
S
LCD_R
S
T
AS
IC_R
S
T
INT0
S
LCD_R
S
T
MLCD_R
S
T
AS
IC_R
S
T
INT0
V
DD18
V
DGND
C501
0.1u
10
3.3
V
G18
RF_R
A
DIO_EN/E
X
TINT9
J
1
7
RF_
S
CLK/
S
D_D
2
IF_D
A
T
A
_D
A
H1
7
RF_
S
D
A
TA
_IN/
S
D_D3
IF_D
A
T
A
_A
D
J
18
J
1
6
RF_
S
EN/
S
D_WR_PROT
H19
RF_
S
LOT_CTRL/
S
D_DETECT
IF_INT_
A
N
A
H18
RF_TR_D
A
TA
/E
X
TINT10
G1
7
E
X
TINT15/
SY
NCPORT
IF_ML
S
E
IF_T_D
A
T
A
M14
R532
NC
R550
NC
DGND
R552
NC
R553
NC
R554
NC
R555
4.7k
R551
4.7k
R530
0
RE
S
ETOUT
S
PI
2
DO
001:8C
R5
27
NC
0.01u
2
5
S
PI
2
DI
001:8C
R517
33k
C530
R
X
RD
Y
R511
1
k
OP_DET
001:
6
D;004:
6
C
S
PI
2
CK
001:8C
RE
S
ETOUT
001:8B
R52
0
NC
DGND
DGND
CN505
1
E
S
D-
VSS
2
V
G
3
4
V
O
5
V
M
6
7
8
9
10
11
1
2
A
O
13
14
15
E
S
D-
VSS
C581
NC
C592
1u
DGND
C580
22u
6.3
C591
16
1u
C589
1u
1u 10
L51
0
C590
C588
1u
R54
9
100
1
2
3
4
5
6
7
8
R
X
RD
Y
001:8B
DGND
C531
NC
DGND
C534
NC
R54
7
100
CN50
6
1
2
3
4
5
6
7
8
9
10
11
1
2
R544
4
7
0
C535
0.1u16
1
2V
D50
2
R5
66
100
DGND
DGND
C536
0.1u16
3.3
V
R543
C542
NC
DGND
DGND
R580
NC
DGND
R581
NC
DGND
R5
7
9
NC
DGND
R58
2
NC
R584
NC
DGND
DGND
C552
1000p
DGND
Cloc
k out str
a
p
Boot str
a
p
Fro
m
/To D
SS
To
S
el
f-L
a
belin
g
LCD
S
PI_DI
OP_DET
RF_
S
D
A
TA
_OUT/
S
D_D1
L15
K1
7
L14
J
19
K14
K15
K1
6
J
15
J
14
IF_EN_
A
D
IF_EN_D
A
IF_N
A
RE
S
IF_R
X
1
V
DDIO_RF
A
PU
IC50
2
S
PI_CK
S
PI_DO
DGND
DGND
S
CL
S
D
A
/RE
S
/C
S
V
DD1
V
D1
VSS
V
DD
A
XV
O
R583 NC
DGND
DGND
DGND
DGND
D503
4/4
6
5
8
7
D
E
F
K
X
-NT553
58
/ K
X
-NT55
6
58
M
A
IN BO
A
RD No.1 4/4
(2
4)
(2
3)
(22
)
(2
1)
(2
0)
(19)
(18)
(1
(1
7)
(1
6)
(15)
(14)
(14)
(13)
(1
(1
2)
(11)
(2
4)
(5)
52
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
12.2. Main No.2
MDI_LB_P
MDI_L
A
_N
MDI_L
A
_P
MDI_LB_N
L
2S
W_10
V
C303
0.1u
16
C305
0.1u
16
L301
L
2
_
V
DD10
C322
NC
C32
4
NC
C301
10u
10
DGND
IC301
7
AVDDH1
8
P1MDIA
P
9
P1MDIA
N
10
P1MDIBP
11
P1MDIBN
12
AVDDL
2
13
GND2
14
P1MDICP
15
P1MDICN
16
P1MDIDP
17
P1MDIDN
18
PLLV
DDL
19
ATE
STCK
20
PLLGND
21
GND3
22
AVDDH
2
23
P2MDI
AP
24
P2MDI
AN
25
P2MDIBP
26
P2MDIBN
27
AVDDL3
28
GND4
29
P2MDICP
30
P2MDICN
31
P2MDIDP
32
P2MDIDN
33
AV
DDH3
34
P3MDI
A
P
35
P3MDI
A
N
3
6
P3MDIBP
3
7
P3MDIBN
38
AV
DDL4
39
40
P3MDICP
41
P3MDICN
4
2
P3MDIDP
43
P3MDIDN
44
AV
DDH4
45
4
6
4
7
MDIREF
48
AV
DDL5
49
50
51
5
2
AV
DDH5
53
D
V
DDIO1
54
INTERRUPT
55
DI
S
_LPD/BUZZER
5
6
D
V
DDL1
5
7
RE
S
ER
V
ED1
58
RE
S
ER
V
ED
2
59
AV
DDH
6
6
0
6
1
AV
DDL
6
62
AV
DDH
7
6
3
AV
DDL
7
6
4
AV
DDH8
65
RES
ERV
ED3
66
RES
ERV
ED4
67
RES
ERV
ED5
68
RES
ERV
ED6
69
RES
ERV
ED7
70
DV
DDIO2
71
DV
DDIO_1_1
72
GND9
73
E1_CRS
/G1_CRS
/M1M_CRS
74
E1_DO7/G1_T
XD
7
75
E1_DO6/G1_T
XD
6
76
E1_DO5/G1_TX
D5
77
E1_DO4/G1_TX
D4
78
E1_DO3/G1_TX
D3/RG1_TX
D3/M1M_TX
D3/M1P_RX
D3
79
E1_DO2/G1_T
XD
2/RG1_T
XD
2/M1M_T
XD
2/M1P_R
XD
2
80
E1_DO1/G1_TX
D1/RG1_TX
D1/M1M_TX
D1/M1P_RX
D1
81
E1_DO0/G1_TX
D0/RG1_TX
D0/M1M_TX
D0/M1P_RX
D0
82
E1_DOEN/G1_TX
EN/RG1_TX
CTL/M1M_TX
EN/M1P_RX
DV
83
E1_GOCLK/G1_GTX
C/RG1_TX
CLK/M1M_TX
CLK/M1P_RX
CLK
84
E1_DOCLK/G1_TX
CLK
85
GND10
86
E1_DICLK/G1_RX
CLK/RG1_RX
CLK/M1M_RX
CLK/M1P_TX
CLK
87
E1_DIDV
/G1_RX
DV
/RG1_RX
CTL/M1M_RX
DV
/M1P_TX
EN
88
E1_DI0/G1_RX
D0/RG1_RX
D0/M1M_RX
D0/M1P_TX
D0
89
E1_DI1/G1_RX
D1/RG1_RX
D1/M1M_RX
D1/M1P_TX
D1
90
E1_DI2/G1_R
XD
2/RG1_R
XD
2/M1M_R
XD
2/M1P_T
XD
2
91
E1_DI3/G1_RX
D3/RG1_RX
D3/M1M_RX
D3/M1P_TX
D3
92
E1_DI4/G1_RX
D4
93
E1_DI5/G1_RX
D5
94
E1_DI6/G1_R
XD
6
95
E1_DI7/G1_R
XD
7
96
DV
DDIO_1_2
9
7
GND11
98
D
V
DDIO3
99
D
V
DDL
2
100
D
V
DDIO4
101
D
V
DDL3
10
2
P4LED
2/DI
S
_S
PI
S
103
P3LED1
104
P3LED
2/RE
S
ER
V
ED
105
P3LED0/RE
S
ER
V
ED
10
6
P
2LED
2/DI
S
_8051
10
7
P
2LED0/DI
SA
UTOLO
A
D
108
P
2LED1
109
P1LED
2/RE
S
ER
V
ED
110
P1LED0/RE
S
ER
V
ED
111
P1LED1
11
2
P0LED
2/EN_PH
Y
113
P0LED1/LED_D
A
114
P0LED0/LED_CK/
S
MI_
S
EL
115
AV
DDH9
11
6
X
T
A
LO
11
7
X
T
A
LI
118
GND1
2
119
*RE
S
ET
1
2
0
S
PI
S
_C
S
I
1
2
1
S
PI
S
_CK/
S
CK/MMD_MDC
1
22
S
PI
S
_DI/
S
D
A
/MMD_MDIO
1
2
3
S
PI
S
_DO
1
2
4
AV
DDH10
1
2
5
P0MDI
A
P
1
26
P0MDI
A
N
1
27
P0MDIBP
1
2
8
P0MDIBN
1
AVDDL1
2
GND1
3
P0MDICP
4
P0MDICN
5
P0MDIDP
6
P0MDIDN
R310100
1
2
3
4
5
6
7
8
E_RX
D[0]001:
6B
E_RX
D[1]001:
6B
E_RX
D[2
]001:
6B
E_RX
D[3]001:
6B
R308
100
E_RX
DV
001:6A
E_RX
CLK001:
6B
R306
100
E_TX
EN
001:6
B
E_TX
D[3]001:
6B
E_TX
D[2
]001:
6B
E_TX
D[1]001:
6B
E_TX
D[0]001:
6B
E_TX
CLK001:
6B
PH
Y
_nR
S
T
001:5
A
DGND
C410
0.01u
PH
Y
_INT
001:5B
DGND
R311
4.7k
R31
2
4.
7k
R313
4.
7k
DGND
2
5MOUT
001:5C
E_MDCLK
001:
6A
E_MDIO
001:
6A
R30
2
1.5
k
L
2
_D
V
DD
L
2
_
AV
DD
L
2
_
AV
DD
L
2
_
AV
DD10
L
2
_
V
DD10
L
2
_
V
DD10
L304
L
2
_
V
DDPLL10
L
2
_
V
DDPLL10
E_CRS
001:6
B
R315
2
.49
k
R314
4.
7k
DGND
DGND
DGND
R303
1k
1
2
3
4
5
6
7
8
R30
7
1
k
R309
100
CL32
1
CL3
2
3
CL3
22
R338
1.5
k
R342
0
R3430
R3404.
7k
R348
NC
R349
4.7k
R350
4.7k
R362
4.7k
R36
34.
7k
R36
4
NC
R316
NC
R318
NC
R319
4.7k
R32
0
NC
R32
3
4.7k
R327
4.7k
R334
4.7k
R344
4.7k
L
2
_D
V
DD
DGND
R304
0
R3
6
54
.7k
DGND
C30
7
1000p
DGND
R31
7
NC
L305
0
GND8
GND5
RTT
2
GND
7
RTT1
A
GND
GND
6
(1
6)
(15)
(14)
(13)
(14)
(13)
(1
2)
(11)
(10)
(10)
(9)
(8)
(7
(7
)
(6
)
(5)
(4)
(3)
(2
)
(1)
1/4
C
B
A
3
2
1
4
K
X
-NT553
58
/ K
X
-NT55
6
58
M
A
IN BO
A
RD No.
2
1/4
(1
1)
(8)
(14)-(
2
)
(18)-(
2
)
(22
)-(
2
)
(15)-(
2
)
(19)-(
2
)
(1
6
)-(
2
)
(2
0)-(
2
)
(2
3)-(
2
)
(1
7
)-(
2
)
(2
1)-(
2
)
(13)-(
2
)
(13)-(1)
(1
2
)-(1)
(1
2
)-(
2
)
Click on the first or last page to see other KX-NT553RU-B / KX-NT556RU-B service manuals if exist.