Panasonic KX-NT553RU-B / KX-NT556RU-B Service Manual ▷ View online
65
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
G
R
G
R
G
R
G
R
G
R
G
R
G
R
G
R
G
R
G
R
G
R
G
R
G
R
LED
STB5
LED_STB6
LED_STB0
LED_STB1
LED_STB2
LED_STB3
LED_STB4
LED_STB5
I2C_SDA
I2C_SCL
ASIC_RST
_R
_G
LED_STB4
LED_STB5
LED_STB6
LED_STB7
LED_BELL_R
LED_BELL_G
INT0
LED_STB7
LED_STB0
LED_STB1
LED_STB2
LED_STB3
LED_COM0LED_COM0
LED_COM1
LED_COM2
LED_COM3
LED_COM4
LED_COM5
LED_COM5
LED_COM4
LED_COM3
LED_COM2
LED_STB0-R
LED_STB2-R
LED_STB2-R
LED_STB1-R
LED_STB0-R
LED_STB4-R
LED_STB2-R
LED_STB2-R
LED_STB4-R
LED_STB0-R
D222
CO9
3
4
1
2
D230
CO7
3
4
1
2
D227
CO1
3
4
1
2
D214
CO11
3
4
1
2
D219
CO3
3
4
1
2
D211
CO5
3
4
1
2
D218
CO10
3
4
1
2
D226
CO8
3
4
1
2
D223
CO2
3
4
1
2
D210
CO12
3
4
1
2
D215
CO4
3
4
1
2
D233
CO6
3
4
1
2
0.1u
C243
10n
C201
0.1u
3.3V
IC205
1
CLKIN
12
KEYIN2
13
KEYIN3
23
LED_COM3
34
LED_COM6
14
KEYIN4
15
KEYIN5
16
KEYIN6
17
KEYIN7
18
VSS2
19
VDD2
20
LED_COM0
21
LED_COM1
22
LED_COM2
24
LED_STB0
25
LED_STB1
26
LED_STB2
27
LED_STB3
28
LED_STB4
29
LED_STB5
30
LED_STB6
31
LED_STB7
32
LED_COM4
33
LED_COM5
35
LED_COM7
36
VDD3
37
VSS3
38
INT_OUT0
39
INT_OUT1
40
TEST
41
RESET
42
SCS
43
SCLK
44
SDI
2
CLKOUT
3
VDD1
4
VSS1
5
SDO
6
GKEYIN0
7
GKEYIN1
8
PSBIN
9
PSBOUT
10
KEYIN0
11
KEYIN1
D234
SP-PHONE
A
RA201
4.7k
1
2
3
4
5
6
7
8
6
7
8
C211
4.7u
4.7u
D249
D248
3.3V_L
Q204
R202
220
R255
1k
R203
68
L211
3.3V_L
R256
NC
D254
INT'COM
3
4
1
2
D251
STORE
D250
MUTE
D253
FWD
D252
CONF
DG
DG
DG
RA202
4.7k
1
2
3
4
5
6
7
8
6
7
8
DG
R257
1k
R258
1k
DG
Q207
Q205
Q206
Q208
DG
R212
NC
R213
NC
R214
NC
J287
J288
J289
J286
J290
J291
J292
J293
J294
J297
R241
56
R242
56
R243
56
R244
56
R245
56
R246
56
(7
)(
8)
(9
)(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(32)
(31)
(30)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
C
B
A
6
5
8
7
2/4
KX-NT553
58
/ KX-NT556
58
OPERATION BOARD 2/4
66
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
EHS_DATA
Vraw
R221
NC
3.3V
C223
18p
C224
18p
EHS_RX
R210
10k
IC204
1
2
3
4
R208
10k
EHS_DET
R220
330
JK202
1
Q202
R201
1k
R230
22
R231
22
C226 330p
C205
1000p
AG_PAD
R228
0
5V
R226
330
MIC-
MIC+
R2
220
C1
NC
R1
220
MIC1
1
2
R254
10k
AG
AG
R253
33k
D206
D244
Q203
4.7k
10k
Q201
C207
NC
D1
NC
1
2
L212
AG
HEADGND
HEADGND
HEADGND
HEADGND
IC203
1
2
3
5
4
IC202
1
23
5
4
D256
IC201
1
23
4
Q213
EHS_TX
AG
JABRA_URX
JK204
4
1
3
2
R209
10k
C206
NC
R205
150
JABRA_UTX
D246
1
2
R207
150
R204
0
D100
D101
D102
D103
BKLT1P
BKLT1N
Q214
AG
R260
2.2k
R100
330
R101
330
R102
330
R103
330
Protect circuit recommended by Plantronics
Insulated by secondart circuit
mini PCB
BKLT PCB
(1)
(2)
(3)
(4)
(5)
(6)
(33)
E
D
F
3
2
1
4
3/4
KX-NT553
58
/ KX-NT556
58
OPERATION BOARD 3/4
(22)
(22)
Jabra
Plantronics
67
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
LED_STB0
LED_STB1
LED_STB5 LED_STB4
LED_STB2
LED_STB3
KEYIN3
KEYIN4
LED_STB6
KEYIN2
KEYIN3
KEYIN4
KEYIN5
KEYIN7
LED_STB3
LED_STB3
LED_STB0
LED_STB1
LED_BELL_R
LED_STB1
LED_STB0
HEADSET_MIC
HOOKSW
3.3V
LED_STB2
LED_STB2
HOOKSW
5V
3.3V
INT0
EHS_DET
LED_STB7
KEYIN0
KEYIN2
KEYIN7
KEYIN5
LED_COM2
LED_COM0
LED_COM1
KEYIN1
*
12
FLASH/RECALL
12
SOFT3L
12
9
12
MESSAGE
12
1
12
HOLD
12
ENTER
12
SOFT3R
12
REDIAL
12
0
12
7
12
SOFT4L
12
SOFT2R
12
SOFT1L
12
#
12
5
12
SOFT1R
12
FWD/DND
12
INT'COM
12
3
12
CONF
12
SOFT4R
12
8
12
6
12
SOFT2L
12
TRANSFER
12
4
12
2
12
PAUSE
12
C203
0.1u
CO7
12
CO1
12
CO9
12
CO8
12
CO2
12
CO5
12
CO3
12
CO6
12
CO11
1
2
CO10
12
CO12
12
CO4
12
SP-PHONE
12
D235
D238
D239
D237
D236
D240
D241
J252
J242
J255
J240
J246
J244
J273
J254
J243
J253
J256
J250
J274
J259
J262
J248
J265
J269
J238
J272
J236
RIGHT
12
LEFT
12
UP
12
DOWN
12
J275
J276
D242
AUTOANS/MUTE
12
AUTODIAL/STORE
12
CANCEL
12
DG
RA204
1k
1
2
3
4
5
6
7
8
DG
DG
NEXTPAGE
12
Q209
Q210
Q208
DG
R214
NC
DG
R215
NC
R217
NC
R216
NC
Chip Jumper near JACK
Chip Jumper near FF key
(7
)(
8)
(9
)(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(33)
4/4
6
5
8
7
D
E
F
KX-NT553
58
/ KX-NT556
58
OPERATION BOARD 4/4
68
KX-NT553RU/KX-NT553RU-B/KX-NT556RU/KX-NT556RU-B
12.6. Waveform
12.6.1.
No.(1)-(5)
Main LCD SIGNAL
CS
A0
SCL
SID
A0
SCL
SID
RESET SIGNAL
3.3V
TP PWR-RST
X501 Pin 1
X502 12MHz
X502 Pin 1
NAND Flash(IC504) SIGNAL
CLE
CS
WR
I/0_0
CS
WR
I/0_0
Self-labeling LCD SIGNAL
CS
A0
SCL
SID
A0
SCL
SID
1
2
3
4
5
5
X501 25MHz
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