Panasonic TH-42PX20U-P Service Manual page 174

PA-BOARD TXNPA1QKSU (2/3)
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1
2
3
R2303
4
5
6
7
8
MUTE SW
R2396
R2393
0
0
R2394
Q2312 R2391
Q2311 6.8k
6.8k
2SD0601A0L
2SD0601A0L
R2395 C2339
R2392
50V
R2389 27k 27k
10u
560
R2390
1k
C2342 C2344
50V 16V R2348 R2347
R2387 R2386 10u R2375
220u 10k 47k
Q2310 560 1k 10k
2SD0601A0L R2398
C2352 R2376
R2368
1k
16V
22k
47k
100u Q2309
R2346
47k
2SD0601A0L Q2305
2SD0601A0L
Q2306
2SD0601A0L
9
10
11
12
13
TH-42PX20U-P PA-BOARD (2 of 3) Schematic Diagram
10 11
IC2301
WOOFER AMP-L
C2331
25V
R2301 0.1u C1BA00000278
100k
100
1 HP IN HP OUT 28
C2315
50V
C2303 C2301 6dB
2 H/P LIPPLE 27 0.047u
16V 16V 1u
STB SW FILTER
C2317
1u C2305 R2309
=
35V 3 LIPPLE 26 35V 1/2W
L NC
FILTER 220u
10
47u
4 AMP 25
SW GND
STB SW R2333
SW REG.PART
SW 0
5 NC 24 Q2301 R2331
SW B
HLS 0
2SD1266AQ0LB
SW
6 NC 23
E
L2301 D2301
SW
7 ON TIME 22 220uH
B0JCME000025
OUT
C2307 Vcc(SW) C2321
8 NC 21
50V
50V
22u
L 2.2u
9 20
PRE GND Vcc
C2323 =
C2309 C2325
50V R2311
10 19
R2307 50V NC 25V
2.2
2.2u Thermal 1000p
1k 470u
Pad
11 IN 18 1/2W
NP
BEEP
R2305 12 OUT- 17
C2311
2.2k
50V
OUT+
13 16
6800p POWER GND
C2327
C2329
14 15 50V
POWER GND POWER GND 50V
C2313 0.1u
0.1u
50V
2.2u R2313
R2315
1/2W
2.2
2.2
1/2W
= =
IC2302
C2332
WOOFER AMP-R
25V
C1BA00000278
0.1u
R2304 R2302
100
100k
HP IN HP OUT
1 28
C2316
C2302
C2304 6dB 50V
16V 1u H/P LIPPLE
2 27 0.047u
16V
C2306 STB SW FILTER
C2318 R2310
1u
35V LIPPLE 35V =
3 26 1/2W
R NC
FILTER 10
220u
47u
4 AMP 25
STB SW SW GND R2334
0
SW REG.PART
5 SW 24 Q2302 R2332
NC
SW B
HLS 0
2SD1266AQ0LB
6 SW 23
NC
E
L2302 D2302
SW
7 ON TIME 22 220uH
B0JCME000025
OUT
C2308 Vcc(SW) C2322
8 NC 21
50V 50V
R
22u 2.2u
9 PRE GND 20
Vcc
=
C2310 C2326
R2312
R2308 50V 10 NC 19
25V
C2324 1/2W
1k 2.2u Thermal
470u 2.2
Pad 50V
NP 11 IN 18
1000p
R2306 BEEP
12 OUT- 17
2.2k C2312
50V
13 OUT+ 16
6800p POWER GND
C2328
C2330
14 15 50V
POWER GND POWER GND 50V
C2314 0.1u
0.1u
50V
2.2u
R2314 R2316
1/2W
2.2
2.2
1/2W
= =
IC2305
SQUAWKER AMP-L
C1BA00000278
1 HP IN HP OUT 28
R2321
6dB
H/P LIPPLE
100k 2 27
C2345 STB SW FILTER C2387
R2329
35V 47u LIPPLE 35V
20k 3 L NC 26
FILTER 220u
AMP
4 25
SW GND R2337
STB SW
SW REG.PART 27
5 NC SW 24 Q2313 R2335
SW B
HLS 0
B1BBCF000013
6 SW 23
NC
E
L2307
D2303
7 SW 22
ON TIME 220uH
OUT B0JCME000025
C2347
8 Vcc(SW) 21 C2391
NC
L 50V
50V
22u
2.2u
9 20
PRE GND Vcc
C2395
C2349
C2393 R2323
50V
R2317 50V 10 NC 19
25V 1/2W
2.2u
270 Thermal 1000p
470u = 2.2
Pad
NP 11 IN 18
R2319 BEEP OUT-
12 17
2.2k C2383
50V OUT+
13 16
POWER GND
6800p
C2397
C2399
14 15 50V
POWER GND POWER GND 50V
0.1u
C2385
0.1u
50V
R2325
R2327
2.2u
1/2W
2.2
2.2
=
= 1/2W
IC2306
SQUAWKER AMP-R
C1BA00000278
1 HP IN HP OUT 28
R2330
R2322
20k 6dB
100k 2 H/P LIPPLE 27
STB SW FILTER C2388
C2346
35V
35V 47u 3 LIPPLE R 26
NC
FILTER
220u
4 AMP 25
SW GND
STB SW R2338
SW REG.PART
SW 27 Q2314
5 NC 24 R2336
SW
B
HLS 0
B1BBCF000013
SW
6 NC 23
E
L2308
D2304
SW
7 ON TIME 22 220uH
OUT B0JCME000025
C2348 Vcc(SW) C2392
8 NC 21
50V 50V
R
22u
2.2u
9 20
PRE GND Vcc
C2396 =
C2394
C2355
R2318 10 19 50V 1000p R2324
NC 25V
50V 1/2W
270 Thermal
2.2u 2.2
Pad 470u
11 IN 18
NP
BEEP
R2320 12 OUT- 17
2.2k C2384
50V
OUT+
6800p 13 16
POWER GND
C2398 C2400
14 15 50V 50V
POWER GND POWER GND
C2386
0.1u 0.1u
50V
R2326 R2328
2.2u
1/2W
2.2
2.2
= = 1/2W
12 13
+12Vs
R2339
3.9k
C2338
16V
100u
+ TO
PF-BOARD
<
(PF10)
PA10
TPB7521
1
NR_21V
L2303
2
EXCELDR35V NR_21V
3
C2333 GND
25V
4
GND
470u
5
NR_14V
TPB7523
6
GND
7
STB_5V
8
GND
9
PF_AC_ON/OFF
10
GND
C2337
16V
100u
HP_R
+ 6
R2397
GND
0 5
HP_L
4
R2399
GND
0
3
HP_SUB
2
L2304
GND
EXCELDR35V
1
TO
C2334
PA9
25V
G-BOARD
470u
(G5)
PA1 TO WOOFER
(W-R & W-L)
1
W_R+
2
W_R-
3
NC
4
W_L+
5
W_L-
TO
P-BOARD
PA7 (P7)
1
+15Vs
D2305
R2340 2
+15Vs
B0HAPM000037
3.9k
3
GNDs
4 GNDs
<
L2309
0
C2389
25V
470u
TO SQUAWKER
PA3
(SP-R & SP-L)
1
SP_R+
2
SP_R-
3 SP_L+
4
SP_L-
L2310
0
<
C2390
25V
470u
14
IC7501
C0DAAZG00006
SUB_9V1
TPB7522
L7501
G0C101K00023
1%
C7535
R7501
16V
C7501 1%
820
R7502 0.47u
25V
1.87k
L7502 L7503
470u
100u 33u
C7502
C7503
D7501
25V 50V
MA2Q73700L
470u 0.01u
IC7502
C0DAAZG00006
SUB_9V2
L7504
G0C101K00023
1%
C7536
C7505 R7503
1% 16V
25V 806 R7504
0.47u
470u
L7505 3.92k L7506
100u 33u
SUB9V2
C7506
C7570
D7504
25V 50V D7505
MA2Q73700L
0.01u MAZ21200A0LS
470u
IC7503
C0DAAZG00006
SUB_5V
L7507
R7588
G0C101K00023
0
1%
C7537
R7507
1% 16V
C7511
820
R7508
0.47u
25V
1.87k
L7508
470u
100u
SUB5V
L7509
C7512 C7513
22u
D7507 25V 50V
MA2Q73700L 470u 0.01u
Q7541
Q7543
R7543
2SB0709A0L 2SB0709A0L
1k
C7542
R7541
R7544
16V
2.2k
R7539 2.2k
0.1u
2.2k
R7525
D7541
4.7k R7532
MA2J11100L
470
R7540
4.7k
C7541
D7542 R7533
16V
MA2J11100L 470
0.1u
D7543 R7534
MA2J11100L 470
Q7504
D7544 R7535
UNR221400L MA2J11100L 220
D7545 R7536
MA2J11100L 470
D7537
R7537 MA2J11100L
10k
Q7544
D7538
2SD0601A0L R7538 MA2J11100L
10k
15 16
TPB7501
SUB9V1
D7502 C7530
MAZ20680A0LS 16V
330u
C7531
Q7501 16V
330u
TPB7502 TPB7508
B1DHDD000013
MAIN9V
C7509 R7505
50V
22k
10u
R7506
2.2k
Q7502
UNR221400L
TV-ON
TPB7503
D7508
MAZ20680A0LS C7532
16V
330u
Q7542
R7547
2SB0709A0L
1k
R7545 C7544
R7548
2.2k 16V
1% 0.1u
2.2k
R7546
D7549
1% R7559
2.2k MA2J11100L
8.2k
1% 27
D7547 R7542
C7543
MA2J11100L 470
0.1u
D7546
MA3X152E0L
D7539
D7540
MAZ30620HL MAZ30390HL
R7526
R7527
R7549
4.7k
4.7k
100k
TH-42PX20U-P
PA-BOARD (2 of 3) Schematic Diagram
17 18
21
22
23
24
25
26
28
29
30
31
32