Panasonic TH-42PX20U-P Service Manual page 213

14.14. PA-Board (2 of 3) Schematic Diagram
PA-BOARD TXNPA1QKSU (2/3)
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1
2
3
4
5
6
7
8
MUTE SW
Q2312
Q2311
2SD0601A0L
2SD0601A0L
R2389
560
R2390
1k
R2387
R2386
560
Q2310 1k
2SD0601A0L
R2398
C2352
R2368
1k
16V
47k
100u
Q2309
2SD0601A0L
9
10
11
12
13
TH-42PX20U-P PA-BOARD (2 of 3) Schematic Diagram
10
R2303
100
C2303
16V
1u
R2307
1k
R2305
2.2k
R2304
100
C2304
16V
1u
R2308
1k
R2306
2.2k
R2396
R2393
0
0
R2394
R2391
6.8k
6.8k
R2395 C2339
R2392
50V
27k 27k
10u
R2321
C2344
C2342
100k
R2347
50V 16V R2348
R2375
10u
220u 10k
47k
10k
R2376
22k
R2346
47k
Q2305
2SD0601A0L
Q2306
2SD0601A0L
R2317
270
R2319
2.2k
R2322
100k
R2318
270
R2320
2.2k
11
IC2301
WOOFER AMP-L
C2331
25V
R2301
C1BA00000278
0.1u
100k
HP IN HP OUT
1 28
C2301 6dB
H/P LIPPLE
2 27
16V 1u
STB SW FILTER C2317
C2305
35V
35V LIPPLE
3 L 26
NC
FILTER 220u
47u
AMP
4 25
SW GND
STB SW
R2333
SW REG.PART
SW
5 24 0
NC
SW
B
HLS
SW
6 23
NC
E
SW
7 22
ON TIME
OUT
C2307
Vcc(SW)
8 21
NC
50V
22u
L
9 20
PRE GND
Vcc
C2323
C2309
50V
10 19
50V NC
1000p
2.2u Thermal
Pad
NP 11 IN 18
BEEP OUT-
12 17
C2311
50V
OUT+
13 16
6800p POWER GND
14 15
POWER GND POWER GND
C2313
50V
2.2u
IC2302
C2332
WOOFER AMP-R
25V
C1BA00000278
0.1u
R2302
100k
1 HP IN HP OUT 28
C2302
6dB
16V H/P LIPPLE
1u 2 27
STB SW FILTER
C2306 C2318
35V LIPPLE
3 26
R NC
FILTER
220u
47u
AMP
4 25
SW GND R2334
STB SW
0
SW REG.PART
SW
5 24
NC
SW
B
HLS
SW
6 23
NC
E
7 SW 22
ON TIME
OUT
C2308 Vcc(SW)
8 21
NC
50V
R
22u
9 20
PRE GND
Vcc
C2310
10 19
50V NC
C2324
Thermal
2.2u
Pad 50V
NP 11 IN 18
1000p
BEEP
OUT-
12 17
C2312
50V
OUT+
13 16
6800p POWER GND
14 15
POWER GND POWER GND
C2314
50V
2.2u
IC2305
SQUAWKER AMP-L
C1BA00000278
HP IN HP OUT
1 28
6dB
H/P
LIPPLE
2 27
STB SW FILTER
C2387
C2345
R2329
35V 47u 35V
3 LIPPLE 26
20k NC
L
FILTER 220u
AMP
4 25
SW GND
R2337
STB SW
27
SW REG.PART
SW
5 24
NC
SW
B
HLS
SW
6 23
NC
E
SW
7 22
ON TIME
OUT
C2347
Vcc(SW)
8 21
NC
L 50V
22u
9 20
PRE GND
Vcc
C2395
C2349
50V
10 19
50V NC
2.2u
Thermal
1000p
Pad
11 IN 18
NP
BEEP
OUT-
12 17
C2383
50V OUT+
13 16
POWER GND
6800p
14 15
POWER GND POWER GND
C2385
50V
2.2u
IC2306
SQUAWKER AMP-R
C1BA00000278
HP IN HP OUT
1 28
R2330
6dB
20k
H/P LIPPLE
2 27
C2346 STB SW FILTER C2388
35V 47u 35V
LIPPLE R
3 26
NC
FILTER
220u
AMP
4 25
SW GND
STB SW
R2338
SW REG.PART
27
5 SW 24
NC
SW B
HLS
SW
6 23
NC
E
SW
7 22
ON TIME
OUT
C2348
Vcc(SW)
8 21
NC
50V
R
22u
9 20
PRE GND
Vcc
C2396
C2355
50V 1000p
10 19
NC
50V
Thermal
2.2u
Pad
NP 11 IN 18
BEEP OUT-
12 17
C2384
50V
OUT+
6800p 13 16
POWER GND
14 15
POWER GND POWER GND
C2386
50V
2.2u
12
+12Vs
R2339
3.9k
C2315
50V
0.047u
R2309
=
1/2W
10
Q2301
R2331
L2303
0 EXCELDR35V
2SD1266AQ0LB
D2301 C2333
L2301
25V
220uH
B0JCME000025
470u
C2321
50V
2.2u
=
C2325
R2311
25V
2.2
470u
1/2W
C2327
C2329
50V
50V
0.1u
0.1u
R2313
R2315
1/2W
2.2
2.2
1/2W
= =
C2316
50V
0.047u
R2310
=
35V
1/2W
10
Q2302 R2332
L2304
0
2SD1266AQ0LB EXCELDR35V
C2334
L2302
D2302
25V
220uH
B0JCME000025
470u
C2322
50V
2.2u
=
C2326
R2312
25V
1/2W
470u
2.2
C2328
C2330
50V
50V
0.1u
0.1u
R2314 R2316
1/2W
2.2
2.2
1/2W
=
=
R2340
3.9k
<
Q2313 R2335
L2309
0
0
B1BBCF000013
C2389
L2307
D2303
25V
220uH
B0JCME000025
470u
C2391
50V
2.2u
C2393 R2323
25V 1/2W
470u 2.2
=
C2397
C2399
50V
50V
0.1u
0.1u
R2325
R2327
1/2W
2.2
2.2
=
= 1/2W
L2310
0
<
Q2314
R2336
0
B1BBCF000013
L2308
D2304 C2390
220uH
25V
B0JCME000025
470u
C2392
50V
2.2u
=
C2394
R2324
25V
1/2W
2.2
470u
C2398 C2400
50V
50V
0.1u
0.1u
R2326 R2328
1/2W
2.2
2.2
= =
1/2W
13
C2338
16V
100u
+ TO
PF-BOA
(PF10)
NR_21
NR_21
G
G
NR_14
G
STB_5
GN
PF_AC_ON/OFF
GN
C2337
16V
100u
HP_R
+
6
R2397
GND
0
5
HP_L
4
R2399
GND
0
3
HP_SUB
2
GND
1
TO
PA9
G-BO
(G5)
TO W
PA1
(W-R &
1
W_R+
2
W_R-
3
NC
4
W_L+
5
W_L-
TO
P-BOA
PA7 (P7)
1
+15Vs
D2305
2
+15Vs
B0HAPM000037
3
GNDs
4 GNDs
TO S
PA3
(SP-R
1
SP_R+
2
SP_R-
3
SP_L+
4
SP_L-
14
76