QSC PLX Series Technical & Service Manual page 72

8 7
THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATION WHICH IS THE PROPERTY
OF QSC AUDIO PRODUCTS, THAT MAY NOT
BE DISCLOSED, REPRODUCED OR USED
INPUT AND FILTER SECTION, CH A
WITHOUT EXPRESS WRITTEN CONSENT FROM
QSC AUDIO PRODUCTS.
N8 C5
100pF-50V-5%
SH 4, EURO-INPUTS
-IN_CH-A +IN_CH-A -IN_DPA ^C_0805
D
N4
R5 NEG INPUT R9 R12
75 5.60K-.1% 5.60K-.1% A1
N1
J3:3 J4:3
^R_0805
3 3
J1 +14VIC SIGNAL
R RING
J3:2 J4:2 POLARITY
N10
TIP INVERTED
T 2 2
U1:1
S
MC33078-SMT
J3:1 J4:1 N6
3
+
1 1
A1 1
J3:4 J4:4
2
-
2 4 4
3
A-1 GND
1 A-4, GND
N9
J2 A-2 +A
-14VIC
A-3 -A
POS INPUT
R6 R8 R13
C195
75 5.60K-.1% 5.60K-.1%
^R_0805
.001-5%
C6
^C_1206
+IN_DPA
DATAPORT CONNECTED TO INPUT
100pF-50V-5% 6
AS USUAL TO MINIMIZE CROSSTALK
WHEN USING REGULAR INPUTS ^C_0805 A1
+13IN
DP-PAR-F
SW1:4
J3:10 J4:10 C7
14 4 10 10
SH 4
DIP-10
A-10, LED-PAR
N25
+XLR_B -XLR_B
C
47-10NP-10%
N27
INPUTS IN PARALLEL J3:20 J4:20
- SH 3 20 20
2 POLE CASCADED ROLLOFF
-0.15dB, 20Hz. -0.4dB, 10Hz.
+13VCL
A-20, +13V
N28 J5:12 J6:12 N26
R-parallel, 7.5K, 10K, 4.7K, = 2.24K
12 12
R15
7.50K
N31 J5:4 J6:4 N34
^R_0805
4 4 R14
12.7K
N32 J5:3 J6:3 N35
^R_0805
W 3 3
GAIN
3
N33 J5:1 J6:1
R11
1 1 2
J5:2 J6:2
4.75K
2 2
^R_0805
A1
N29
N37
PARALLEL
INPUT SW.
STATUS LED
B
LED-SIGNAL DISPLAY
SH 3 SH 4
N110 +14_DISP +14VIC
J5:8 J6:8
8 8
Q1
3906
^Q_BJTP_SOT-23
Q2
3906
D1
^Q_BJTP_SOT-23 N115 N116
R3
4.75K
4148
^R_0805
^D_SOT-23
Q3
3906 Q5
3904 LM13600M
^Q_BJTP_SOT-23
N118
^Q_BJTN_SOT-23
7
Q4
3906
A
^Q_BJTP_SOT-23
^U_LM13600
D2 N130
PWR GND 4148
^D_SOT-23
CLIP
J5:5 J6:5
5 5
J5:7 J6:7
P
LD5
7
RED N119 N120
J5:6 J6:6
6 6
8 7
68
6
DIP SWITCH TABLE, 10-POS
1 - CLIP LIM, CH-A
2 - LF FILT, CH-A
3 - 30 HZ LF, CH-A
4 - PAR INPUT LED
5 - PAR INPUTS, +
6 - PAR INPUTS, -
7 - BR MONO
8 - 30 HZ LF, CH B
9 - LF FILT, CH B
10- CLIP LIM CH B
N12 N13
R25
15.0K
^R_0805
C8 C12 N17
5 U1:2
+
.1-5% .1-5% 7
6
-
MC33078-SMT
N16
R17
4.75K
SIGNAL
^R_0805 AMP LOOP GAIN -- 32DB REVISION
POLARITY USE SAME VALUE AS PLC-2
INVERTED
NTCBUS
SW1:3
13 3 THERMAL
DIP-10
N230
AND BIAS
SW1:2
J4:6 J3:6 N49
6 12 2
DIP-10 SENSING
A-6, GND
N463
N45
R41 R101
1.50K 1.50K
^R_0805 ^R_0805
P
N473
250
N44 VR43
DISCUSS STAR GND CCW
ROUTE TO SPKR OUTPUT.
R22 R29 R226 = 5.90K for PLC-2
C9
A1 P1
536 5.90K
^R_0805 ^R_0805 N43
100pF-50V-5% +14VIC
^C_0805
A1
N40 U2:2
5 NE5532
U2:1 + N42
NE5532 7
+ SIGNAL N41
POLARITY
1 6
INVERTED -
- C14
U_OPAMP_DUAL1
C11
10pF-50V-5%
47-10NP-10%
R16 ^C_0805
-14VIC
12.7K
SPKR_BUS_A
^R_0805
R23 R31
1.50K 16.5K-1/2W-1%
^R_0805
BR MONO FEED, SH 3
C16
CH_A_SIG
15pF
SW1:1
+13IN
1 11
DIP-10
R106
J3:5 J4:5
5 5
12.7K
A-5, CLIP A
+13VCL
^R_0805
N126
Q12
3906
N136
N127 ^Q_BJTP_SOT-23
N128
Q6
Q13
3906
3904
^Q_BJTP_SOT-23 Q9
^Q_BJTN_SOT-23
3904
^Q_BJTN_SOT-23
U3:1
N124
3 Q10
+
3906
5 2
^Q_BJTP_SOT-23
4 R44
- Q7
N133
3904
383
^Q_BJTN_SOT-23 Q8 ^R_0805
3904
P
R18
^Q_BJTN_SOT-23
20.0K N134
P
^R_0805
CLIP-LIMIT
N121
7
PROCESSOR
-13VCL
6
5 4
N56
POS STEP DRIVER
R66 N57
392K
R52 R55
^R_0805
150K 4.75K U4
^R_1206 ^R_0805
1
GND
2
POSREF
3
BAL/STR
N55 4
V-
D7 ^LM311-SMT
R54 R56
150K 4.75K 10V-1N4740A
^R_1206 ^R_0805
.36W at full clip
POS OUTPUT SECTION
Q14 N66
3906
TH-SUBC-A N67
Q24
^Q_BJTP_SOT-23
3906
^Q_BJTP_SOT-23
Q18
+15NTC
N48
N64 3904
^Q_BJTN_SOT-23
N477
+15NTC
P
R381
Q19
2SC4793
100
^R_0805
P
N50 Q20
CW 2N3904
FULL MUTE, 5.7V
Q16
MUTE+
N90
300V-.2A
SEE SH 3
^Q_BJTN_SOT-23
N91
N92
Q17
300V-.2A
P
^Q_BJTP_SOT-23
N88
Q21
2N3906
N478
N94
P
C20
Q22
2SA1837
R382
.0027 P
-15NTC 100
^C_0805
^R_0805
R48 -15NTC
Q23
3906
2.00K
N96 ^Q_BJTP_SOT-23
N97
^R_0805
N87 D89 MUTE_HI
SH 4
Q25
4148 3904
^D_SOT-23
^Q_BJTN_SOT-23
Q15
3904
N99
^Q_BJTN_SOT-23
N98
PROT
SH 3
DC_SENSE
R50
SH 4
N396 C187
R2
30.1K N139
^R_1206
DATAPORT, SH 4, CLIP A 47.5K
47pF-50V-5%
^R_0805
^C_0805
CLIP_A
N138
NEGREF
N141 R69
392K
R57 R63
^R_0805
150K 4.75K
1
^R_1206 ^R_0805 GND
2
P 3
4
V-
^LM311-SMT
R58 R64
150K 4.75K
NEG STEP DRIVER
^R_1206 ^R_0805
5 4
3 2
C30 N63
47pF-50V-5%
Q41
N61 N62
R110
^C_0805
RFZ44
47.5
Q30 ^R_0805
D15
3904
4148 ^Q_BJTN_SOT-23
^D_SOT-23
8
V+
R79
N60
7
3.01K
6 N59 Q31
^R_0805 3906
5
BAL
^Q_BJTP_SOT-23
N58
P D22
15A-200V
R76
39.2K R115 N75
^R_0805 N68
1.5-2W .1-250V
D9
4148 2SA1302 2SA1302 2SA1302 2SA1302
Q26
N71
^D_SOT-23
MJE15033
D14
Q28 Q34 Q36 Q39
4148
^D_SOT-23
I-MON SH 4
L-Z_A1
N78
N80
D16
D
N81
L1
200V-.2A-50NS
1 2
^D_SOT-23
2UH-14GA-AIR
SPKR-A
SPKR_BUS_A
R98
N84
N461
5.6-2W
E9A E9B
N86
N85 C27
R367
15-2W
.022 E10A E10B
R80
5.6-2W
P P1
PWR-GND, TO SUPPLY CT
N93
D13
200V-.2A-50NS
^D_SOT-23
N95
Q27
N104
MJE15032
N101 D12
Q29 Q35 Q37 Q40
4148
^D_SOT-23
N102
2SC3281 2SC3281 2SC3281 2SC3281
N103
N100 R77
39.2K
^R_0805 N108
R116
D8
1.5-2W .1-250V
4148
^D_SOT-23
D21
15A-200V
NEG OUTPUT SECTION
N145
N146 C29
V-NEGSTEP
47pF-50V-5%
^C_0805
Q32
N144
D17
3904
U5
Q38
4148 ^Q_BJTN_SOT-23
R100
8
V+ ^D_SOT-23
RFZ44
7
47.5
Q33 N147
R84
6
BAL/STR 3906 ^R_0805
5
BAL 2.21K
^R_0805 ^Q_BJTP_SOT-23
-HI-RAIL
3 2
1
+HI-RAIL
D
+MID-RAIL
C34
C
N459
EMI_G
E9C BR-POS
FROM CH B
SHEET 3
BR-NEG
E10C
B
C35
N109
-MID-RAIL
A
SIZE FSCM NO. DWG NO. REV
SH-002403-00
D C
SCALE CAD FILE NO. SHEET
NONE plx2402.sch 2 OF 5
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