DOWNLOAD Panasonic KX-NS0290CE Service Manual ↓ Size: 1.85 MB | Pages: 46 in PDF or view online for FREE

4

In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that con-
tains lead.
We will use PbF when discussing the lead free solder used in our manufacturing process which is made from Tin, (Sn), Silver,
(Ag), and Copper, (Cu).
This model, and others like it, manufactured using lead free solder will have PbF stamped on the PCB. For service and repair
work we suggest using the same type of solder. 

• PbF solder has a melting point that is 50

° ~ 70° F, (30° ~ 40°C) higher than Pb solder. Please use a soldering iron with tempera-

ture control and adjust it to 700

° ± 20° F, (370° ± 10°C). 

Exercise care while using higher temperature soldering irons.:
Do not heat the PCB for too long time in order to prevent solder splash or damage to the PCB.

• PbF solder will tend to splash if it is heated much higher than its melting point, approximately 1100

°F, (600°C).

• When applying PbF solder to double layered boards, please check the component side for excess which may flow onto the

opposite side (See figure, below).

5

There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper,
(Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi). Please check the manufac
turer's specific instructions for the melting points of their products and any precautions for using their product with other 
materials. 
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3mm, 0.6mm and 1.0mm.

When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.

6

PRI BLOCK

SLT BLOCK

PRI I/F

NUMBER OF PORT

PRI30 : 30 PORTS

Transfer rate

PRI30 : 2.048Mbit/s

Line code

PRI30 : HDB3

Framing

PRI30 : CRC-Multiframe or SMF(Sub Multiframe)

PRI FRAMER IC

Lantiq PEF2256H VER.2.2

DPLL

Build-in IC

Line i/f circuit

Main frontend parts
 Pulse trans
 Surge protector
 EMC filter
 Termination : 120

Ω

 RJ45 connecter

Line SYNC

Line SYNC clock Freq. : 2.048MHz

LED 

Status information LED : 5

SERR (RED)  OFF NORMAL / ON ALARM
RAI (RED)  OFF NORMAL / ON ALARM
AIS(RED)   OFF NORMAL / ON ALARM
SYNC(GREEN) ON/FLASH Normal
* FLASH = External Clock Master
DLK(GREEN) ON NORMAL / OFF ALARM

Line I/F connector

CO

RJ45 (Selected by SW501)

Extention

Onboard DC/DC circuit

Input : +15V
Output :  +3.3V

Self diagnosing function

Loopback test by FRAMER IC
Local Loopback function by primary Relay

EXT Interface

Number of Ports

2 Ports

Line interface circuit

2chSLIC/2chCODEC
(PEF4365T/PEB3265F) function
-52V/26mA feeding function
Dial Pulse signal detection function
DTMF signal detection function
Bell signal issuing sending
Hook detecting function
Ring trip detecting function
2w/4w converting function
CODEC function
Test function (loopback, Tone generation)
Programmable digital filtering function
Serial interface function
Caller ID(FSK)generator function
Surge protective function

EXT line interface connector

RJ45* Connector x 1

LED display circuit

None

Onboard DC/DC circuit

Input  :  +15V
Output :  +80V / -55V / +3.3V

7

SLC2 BLOCK

+15V

VBATL

VHR

DC/DC

Ringer

and

T/R Voltage

DC/DC

+3.3V

PRI BLOCK

RJ45

LED X 5

SERR RAI AI SYNC DLK

LOOPBACK

RELAY

TRANS.

TX 2.4 : 1

RX 1 : 1

PEF2256H

Ver.2.2

SCLKR / SCLKX

SYPR / SYPX

RDO

XDI

CLK

SYNC

A0-7

D0-7

/CS

/WR

/RD

/RES

nINT0

MCLK

+3.3V
GND

RL1/RL2

XL1/XL2

OSC(16.384MHz)

HW_CLK (2MHz)

HW_FH

UHW
DHW

SLC

/INT1

Reset IC

NET_REF

RJ45

SLIC

2CH

PEF4365

SERIAL I/F

PCM HIGHWAY : 4MHz

/RESET0

/RESET1

/INT0

CODEC

2CH

PEB3265