Read Panasonic KX-DT521RU Service Manual Supplement online
22
(1)
(2)
(3)
(4)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
KX-DT521 MAIN BOARD NO.1 (2/2)
(11) DPT - PBX signal (Receiving signals)
(12) DPT - PBX signal (Transmitting signals)
(12) DPT - PBX signal (Transmitting signals)
(12) DPT - PBX signal (Transmitting signals)
(12) DPT - PBX signal (Transmitting signals)
(16) DXDP signal (Receiving signals)
(17) DXDP signal (Transmitting signals)
(17) DXDP signal (Transmitting signals)
(17) DXDP signal (Transmitting signals)
(17) DXDP signal (Transmitting signals)
+
!A
-
!A
6
5
8
7
A
B
C
D
E
F
JK300
1
2
3
4
5
L301
L302
T300
1
2
4
5
6
7
10
9
8
DG
R301
270
R302
22
R303
22
D301
1
2
3
VDD33
VDD33
DG
VDD33
VDD33
DG
R309
1.2k
R310
120
R311
1.8k
DG
DG
Q303
Q304
1
E1
2
B1
3
C2
4
E2
5
B2
6
C1
C303
1000p 50
C302
1000p
50
VCC33
VDD33
VCCA33
C301
NC
L
H
T
R
H-D
L-D
C305
1u
10
C304
1u
10
R306
8.2k
R307
5.6k
R308
12k
C306 0.1u 10
C310 0.1u 10
C311 0.1u 10
Q301
1
E1
2
B1
3
C2
4
E2
5
B2
6
C1
R319
8.2k
R320
5.6k
R305
1.8k
R304
1.8k
C312
1000p
C313
1000p
C307
1000p
C308
1000p
C325 1u
10
R322
5.6
DG
DG
C557 0.1u 16
C556
0.1u
50
3.3V
L222
NC
L220
NC
L221
NC
D315
C551 0.1u 50
3.3V
DG
R321
27
PG
PG
C309
1u
50
PG
PG
PG
C332 1u 50
C331
1u
50
R342
560
R343
330
VDD33
DG
DG
DG
C330 0.1u 10
R340
100
R341
100
R312
1.2k
R313
1.2k
Q332
1
E1
2
B1
3
C2
4
E2
5
B2
6
C1
DG
C337
1u
50
R348
330
R349
560
DG
VDD33
DG
C333
0.1u
10
DG
C334
NC
VDD33
VDD33
C335 0.1u 10
DG
C336 0.1u 10
DG
DG
R350
4.7k
R351
4.7k
R352
15k
R353
5.6k
R354
6.8k
R355
10k
DG
C533
8200p
IC510
1
BOOT
2
VIN
3
EN
4
SS/TR
5
RT/CLK
6
PWRGD
7
VSENSE
8
COMP
9
GND1
10
PH
11
GND2
D532
D533
C552
0.015u 16
C554
100p
R538
28k
R537
620k
R556
750k
L303
L304
Q331
1
B1
2
E
3
B2
5
C1
4
C2
DG
JK301
1
2
3
4
5
Q330
R552
100k
C550
220u
50
R345
470
R346
4.7
R347
4.7
R541
10k
R547
30.9k
C589
NC
R554
7.5k
R542
NC
R545
NC
R546
NC
C558
100u
16
D300
1
2
3
4
L309
220u
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