KX-HDV330RU, KX-HDV330RUB - Panasonic PBX Service Manual Supplement (repair manual). Page 11

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11
KX-HDV330 Series 
4.2.4.
PoE Circuit
The IC202 integrates a PD(Powered Device) controller and a DC-DC CONVERTER.
PD CONTROLLER
• a resistance(R209:26.7Kohm) for signature detection.
• classification currents (R211:90.9Kohm 1%) for power classification(HDV330 supports Class 3)
DC-DC CONVERTER
• Current limit/ Current Sense(R207)
• Output voltage feedback(R204,R213,R201)
4.2.5.
Analog Circuit
1. Speaker phone call
Transmitting signal is input from microphone MIC1 (differential amplifier circuit) 
 input to IC101-pin L19, M19  A/D conver-
sion, Gain adjustment and echo cancel by built-in DSP of IC101.
Receiving signal input from IP Line 
 Gain adjustment and D/A conversion by DSP of IC101  output from IC101-pin V18,
V19 
 output to Speaker.
LAN port(JK201)
C202
R209
C201
PoE_G
C207
R210
C203
R211
C205
C206
R212
C208
PoE_DC
R213
C220
C219
R214
R206
C217
C216
R205
C215
C214
PoE_G
PoE_G
C213
R204
C211
PoE_G
C210
R202
DG
D218
L202
R201
C221
R208
R207
Q202
IC202
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
C293
Q203
UVLO=36V
Signature
Detection
Classification
Current Sense
<- DC Power 
Output voltage
feedback
IC101
AG
C469
AG
C470
L19
M19
V19
V18
L420
L421
C444
NC
R419
2.2k
R423
3.3k
C441
0.1u
10
R421
220
C440
0.1u
10
C442
NC
C443
NC
R420
2.2k
R424
3.3k
C436
NC
R422
220
AG
AG
AG
AG
AG
AG
AG
AG
AG
R418
330
AG
MICBIAS
C437
10u 10
C438
1000p
C439
1000p
50
C432
330p
50
C433
330p
50
D413
D414
CL_MICP
CL_MICM
R401
220
C401
NC
R414
220
MIC401
1
2
DIFFIN1P
DIFFIN1N
SPP
SPM
C429
D411
D412
CL_SPP
CL_SPM
C431
C428
C427
C426
L407
L408
C430
L405
L406
DG
DG
DG
DG
DG
DG
L410
L411
PAOUTP
PAOUTN

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