Read Panasonic KX-NT630RU-B Service Manual online
12
KX-NT630 Series
4.2.4.
PoE Circuit
The IC2002 integrates a PD(Powered Device) controller and a DC-DC CONVERTER.
PD CONTROLLER
• a resistance(R2046:26.7Kohm) for signature detection.
• classification currents (R2045:90.9Kohm 1%) for power classification(NT630 supports Class 3)
• classification currents (R2045:90.9Kohm 1%) for power classification(NT630 supports Class 3)
DC-DC CONVERTER
• Current limit/ Current Sense(R2030)
• Output voltage feedback(R2027,Q2001,R2028,R2029)
• Output voltage feedback(R2027,Q2001,R2028,R2029)
4.2.5.
Analog Circuit
1. Speaker phone call
Transmitting signal is input from microphone MIC4001 (differential amplifier circuit)
input to IC1001-pin L19, M19 A/D
conversion, Gain adjustment and echo cancel by built-in DSP of IC1001.
Receiving signal input from IP Line
Receiving signal input from IP Line
Gain adjustment and D/A conversion by DSP of IC1001 output from IC1001-pin V18,
V19
output to Speaker.
DC Power
C2043
C2042
R2032
C2047
PoE_DC
C2063
C2039
R2026
C2060
PoE_G_Q
PoE_G_Q
C2058
PoE_G_N
R2043
D2002
L2008
R2030
Q2002
IC2002
1
VAUX
2
CT1
6
VDD48I
3
CT2
4
SP1
5
SP2
7
GND1
8
VDD5
9
RCURR
10
RCLASS
11
LVMODE
12
FB
13
COMP
14
CSS
15
CS
21
GND2
20
VDD48O
19
PDRV
18
VBP
17
VBN
16
NDRV
C2048
Q2001
R2029
R2027
R2040
R2028
R2034
R2033
R2045
C2041
C2040
C2064
D2003
R2046
C2051
C2052
C2050
C2049
PoE_G_N
PoE_G_Q
PoE_G_Q
PoE_G_Q
PoE_G_N
C2054
R2031
C2053
C2046
DG
LAN port (JK2001)
Signature
Detection
Detection
Classification
Current Sense
Output
Voltage
Feedback
Voltage
Feedback
R4029
R4030
IC1001
C4039
R4022
C4037
C4038
C4028
NC
NC
R4023
C4024
C4025
C4013
NC
DG
DG
DG
DG
R4020
C4034
C4033
R4021
R4019
MICBIAS
D4010
D4011
CL_MICP
CL_MICM
C4030
C4031
C4029
R4018
R4017
DG
DG
DG
DG
DG
DG
MIC4001
C4010
D4004
D4005
C4007
C4003
C4004
DG
DG
DG
DG
SPP
SPM
CL_SPP
CL_SPM
L4001
L4002
L4005
L4006
C4011
C4012
DG
DG
L4007
L4008
V19
PAOUTP
V18
PAOUTN
L19
DIFFIN1P
M19
DIFFIN1N
1
2
SP
MIC
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