Panasonic KX-NT551RU-B Service Manual ▷ View online
5
KX-NT551RU/KX-NT551RU-B
3 Specifications
Item
Display
KX-NT551
58
1 line with backlight
Flexible Buttons
8
VoIP Connection Method
MGCP
VoIP Audio Codec
G.722, G711, G.729A
Ethernet Interface
10Base-T/100Base-TX / 1000Base-T
IP Address Mode
Automatic (DHCP), Manual (static)
Speaker
1
Microphone
1
Headset Jack
1 (ø 2.5 mm)
EHS Jack
Dimensions
(W x D x Hmm)
(W x D x Hmm)
205 mm x 150 mm x 170 mm
Weight
(with handset, handset cord
(with handset, handset cord
and stand)
850 g
(842 g)
PoE
Stand-by: approx. 1.9 W (ECO mode off), approx. 1.4 W (ECO mode on)
Talking: approx. 2 W (ECO mode off), approx. 1.6 W (ECO mode on)
Talking: approx. 2 W (ECO mode off), approx. 1.6 W (ECO mode on)
AC Adaptor
Stand-by: approx. 1.8 W (ECO mode off), approx. 1.2 W (ECO mode on)
Talking: approx. 2 W (ECO mode off), approx. 1.5 W (ECO mode on)
Talking: approx. 2 W (ECO mode off), approx. 1.5 W (ECO mode on)
6 W
Power Consumption
Maximum Power Consumption
Operating Environment
Ethernet Port (LAN)
2 (RJ45)
IEEE 802.3af compliant
PoE
0 to 40
Main
6
KX-NT551RU/KX-NT551RU-B
4 Technical Descriptions
4.1.
Block Diagram
Main PCB
Power Supply
Ethernet I/F
RJ45
RJ45
5V DC/DC
Plug
JK301
L2SW
JK402
LAN port
PC port
JK401
PoE
BBIC
IC501
MII
memory
controller
SDRAM
128Mbits
SPI
FLASH
128Mbits
15pin connector
LCD
12pin
connector
Ope PCB
12pin
connector
3.3V
DC/DC
Backlight
Class D
Amp
JTAG
2.2V
DC/DC
25MHz
IC503
IC504
IC303
IC301
Q505
IC401
IC402
GPIO
AFE
SP
MIC
HAND
SET
JACK
ASIC
IC205
I2C
HEAD
SET
JACK
EHS
JACK
LED
KEY
JK202
JK203
CN205
CN101
CN504
USB
IC101
JK101
X501
Analog I/F
CPU, MEMORY
LCD
LED,KEY
12V
9V
3.3V
2.2V
7
KX-NT551RU/KX-NT551RU-B
4.2.
Circuit Operations
4.2.1.
LCD Circuit (Main LCD/Selflabeling LCD)
LCD data are output from pin E17 of IC502 to LCD module.
LCD contrast is set by electronic volume in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
MainLCD : Approx 6.5v (MainLCD)
The driving voltage is observed between Pin 12 (V0) and Pin 13(XV0) of CN502 (Main LCD).
The driving voltage is observed between Pin 4 (V0) and Pin 3 (XV0) of CN505 (Self-Laeling LCD).
The back light for Self-Labeling is controlled by Q102.
LCD contrast is set by electronic volume in LCD module.
+3.3V of the power supply voltage is pressurized about four/three times in the LCD module and used as LCD driving voltage
MainLCD : Approx 6.5v (MainLCD)
The driving voltage is observed between Pin 12 (V0) and Pin 13(XV0) of CN502 (Main LCD).
The driving voltage is observed between Pin 4 (V0) and Pin 3 (XV0) of CN505 (Self-Laeling LCD).
The back light for Self-Labeling is controlled by Q102.
The lighting of the backlight is controlled by Q101 (Main LCD).
The PWM (Pulse Width Modulation) signal is output from IC502-U13 (Main), IC502-V13 (Self) pin and the brightness is changed
according to its duty ratio.
The PWM (Pulse Width Modulation) signal is output from IC502-U13 (Main), IC502-V13 (Self) pin and the brightness is changed
according to its duty ratio.
(Main LCD)
8
KX-NT551RU/KX-NT551RU-B
4.2.2.
Reset Circuit
Reset Signal is output from IC101 and input into IC502-pin V12.
4.2.3.
Ethernet Circuit
The PHY IC (IC401) is used for the Ethernet interface.
It is connected from IC401 to the Ethernet port (JK401) through a transformer and so is isolated.
Also, LAN port (JK402) gets power from the Ethernet line for PoE (Power over Ethernet) as shown below.
It is connected between IC401 and the BBIC (IC501) by high-speed bus called MII (Media Independent Interface) bus operating
with 25MHz.
It is connected from IC401 to the Ethernet port (JK401) through a transformer and so is isolated.
Also, LAN port (JK402) gets power from the Ethernet line for PoE (Power over Ethernet) as shown below.
It is connected between IC401 and the BBIC (IC501) by high-speed bus called MII (Media Independent Interface) bus operating
with 25MHz.
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