61
D
C
B
A
D
C
B
A
87654321
87654321
QSC AUDIO PRODUCTS.
WITHOUT EXPRESS WRITTEN CONSENT FROM
BE DISCLOSED, REPRODUCED OR USED
OF QSC AUDIO PRODUCTS, THAT MAY NOT
INFORMATION WHICH IS THE PROPERTY
THIS DOCUMENT CONTAINS PROPRIETARY
SIZE FSCM NO. DWG NO.
SCALE CAD FILE NO. SHEET
REV
D
DWG NO.
REV SH
PRI_LO
N444
R331
20.0K
^R_0805
6
-
7
+
1
LM339
U13:2
N446
10
-
11
+
13
LM339
U13:4
R330
4.75K
^R_0805
R369
1.00K
^R_1206
C192
10-35V
PRI_LO
C128
.0027
^C_0805
N418
R323
39.2K
^R_0805
R325
24.9K
^R_0805
8
-
9
+
14
LM339
U13:3
C108
.0027
^C_0805
C109
.0027
^C_0805
R322
487K
^R_1206
C107
.1-400V
N417
N416
MURS160T3
D58
^D_SMB
R321
487K
^R_1206
R326
487K
^R_1206
.001-5%
^C_1206
C120
R328
487K
^R_1206
N409N410
N411
PRI_LO
C114
10-35V
+VREF
N419
D91
4148
^D_SOT-23
PRI_LO
C119
470pF-50V-5%
^C_1206
R332
39.2K
^R_0805
N471
R340
392K
^R_0805
N420
R345
100K
^R_1206
D60
MURS160T3
^D_SMB
C121
470pF-50V-5%
^C_1206
.0022-250VAC
C127
R376
10.0K
^R_0805
PRI_HI
R344
100K
^R_1206
N421
C125
.1-50V-10%
^C_1206
4
-
5
+
2
LM339
U13:1
312
+16V N424
4148
^D_SOT-23
D67
10V-.3W
^D_ZEN_SOT-23
D66
N422
XF-PRI
Q99
3906
^Q_BJTP_SOT-23
R375
10.0K
^R_0805
R374
536
^R_0805
N453
R349
39.2
^R_1206
P2P1
T1:1
N423
PRI_LO
R348
2.21K
^R_0805
1
S
2
N/C
3
N/C
4
C
5
D
6
N/C
7
N/C
8
S
U16
TOP 210
R356
10.0
^R_1206
100-25V
C142
N476
R346
20.0K
^R_0805
D61
^200V-.2A-50NS
^D_SOT-23
R337
12.7K
^R_0805
R338
10.0K
^R_0805
PRI_LO
C124
.001-5%
^C_1206
3 4
L6:2
R341
100K
^R_1206
N448
AVERAGE LIMITING HAS
SEVERAL SECOND TIME
CONSTANT TO REACH
2.4V THRESHOLD,
AVE CURRENT 20-25A
3
1
2
6
4
5
NC
NC
U15
PRI_LO
+16V
R336
10.0K
^R_0805
N445
N447
N470
V-STBY
N450
R347
2.21K
^R_0805
+16V
C135
.1-50V-10%
^C_1206
DC-OFF
10.0
^R_1206
R353
N454
D68
^200V-.2A-50NS
^D_SOT-23
ISOL WINDING - 6V
S7 S8
T1:3
N455
PRI_LO
C131
470-16V
Q95
3904
^Q_BJTN_SOT-23
3
1
2
6
4
5
NC
NC
U17
N449
N451
PS-OL
+6 V
PRI_LO
4148
^D_SOT-23
D59
Q92
3904
^Q_BJTN_SOT-23
Q93
3904
^Q_BJTN_SOT-23
N406
N373
N371
2
1
J20
N372
24
L3:2
C115
.0033 250VAC
N309
E11
C118
.0033 250VAC
N377N375
24
L4:2
+VREF
+VREF
^Q_BJTP_SOT-23
Q94 3906
R327
4.75K
^R_0805
R329
12.7K
^R_0805
R334
100
^R_0805
147
N407
N412
N413
N414
N415
R333
150K
^R_1206
R335
150K
^R_1206
N368
EH1
EH2
N378
INRUSH LIMITING RELAY.
QSC-COM, 30A, COIL 24V
MIN VOLT 18V, OK
N376N374N369
2
1
J19
10-OHM-20%
R324
13
L3:1
13
L4:1
R339
750K-1/2W
.47-250VAC
C117
C110
1.0 250VAC
C112
1.0 250VAC
R371
750K-1/2W
F1
25A-125V
1
2
4
6
5
3
NC
NO
{Value}
K1
N382
N383
N380
AC-SW
ES1
ES2
C126
.1-250V-X
E120B
N379
PRI_HI
C132
2200-200V
N381
R351
30K-2W
P5
P6
P7
P3
P2
P1
T2:1
XF-79
12
11
8
10
9
13
COMP
FLIP-FLOP
COMP
THRESHOLD
CONTROL_V
OUTPUT
TRIGGER
RESET
DISCHARGE
U14:2 LM556-SMT
PRI_LO
0V - RUN
5V - SHUTDOWN
E120A
E240
EL1
N384
N458
R373
5.6-2W
N370
PRI_LO
E14
C133
2200-200V
C122
.0022-250VAC
R352
30K-2W
C123
.1-400V
+18V
N428 N427
N426
PRI_LO
100-25V-105C
C138
N117
4148
^D_SOT-23
D65
4148
^D_SOT-23
D64
4148
^D_SOT-23
D63
D62
MURS120T3
S3 S4
T1:2
N429
N430
D74
200V-15A
D71
MUR440
^200V-.2A-50NS
^D_SOT-23
D79
N392
R355
5.6-2W
N389
C146
330p-500V
C113
.0033
R372
56-2W
N472
G
CE
Q97
IRG4PC40
1
LO
7
HO
2
COM
3
VCC
5
VS
6
VB
9
VDD
10
HIN
11
SD
12
LIN
13
VSS
14
8
4
U18
IR2110
PRI_LO
R358
^R_1206
10.0
N393
N395
1 2
L9
6UH-BEAD
N435
N436
N437
.47-400V
C144
N386
C145
330p-500V
N387
D70
MUR440
N388
R354
5.6-2W
^200V-.2A-50NS
^D_SOT-23
D78
1 2
L6:1
N394
N391
N390
D86
MURS160T3
^D_SMB
+16V
R359
^R_1206
10.0
C155
.1-50V-10%
^C_1206
C163
.1-50V-10%
^C_1206
PRI_LO
+VREF
+16V
+VREF
N397
N400
N401
N402
C183
.1-50V-10%
^C_1206
C185
.1-50V-10%
^C_1206
+MID-RAIL
N440
N439
Q98
3906
^Q_BJTP_SOT-23
R362
4.75K
^R_0805
R363
10.0K
^R_0805
N404
PRI_LO
PRI_LO
^R_0805
100
R364
12
GND
15
VIN
16
VREF
14
OUTB
13
VC
11
OUTA
10
SHTDWN
9
COMP
8
SFT-SRT
7
DISCHG
6
RT
5
CT
4
OSC.OUT
3
SYNC
2
+IN
1
-IN
SG3525AN
U19
N398
N399
N403
C184
1-50V
^C_E_ALUM_B
C186
470pF-50V-5%
^C_1206
N405
+VREF
PRI_LO
R366
10.0K
^R_0805
^C_1206
C116
.1-50V-10%
C148
470pF-50V-5%
^C_1206
D77
MURS120T3
D82
MURS120T3
D83
MURS120T3
^D_SMB
R357
39.2
^R_1206
N456
C156
.1-250V
C157
.1-250V
-15V
P1
C143
100-25V
P
N452
100-25V-105C
C149
100-25V-105C
C150
15V-SW
D76
MURS120T3
N433
N431
N432
N434
S16
S15
S14
S13
S12
S11
S17
S20
S19
S18
T2:2
XF-79
4148
^D_SOT-23
D69
D80
200V-15A
D75
200V-15A
D81
200V-15A
P1
PRI_LO
C139
100-25V
N425
1 2
L10
6UH-BEAD
N438
C152
470-100V
C153
470-100V
C159
470-100V
C160
470-100V
C165
470-100V
C166
470-100V
C169
470-100V
C170
470-100V
+15V
PRI_LO
C181
470pF-50V-5%
^C_1206
C182
470pF-50V-5%
^C_1206
R360
7.87K
^R_0805
R361
536
^R_0805
2
3
6
4
5
1
COMP
FLIP-FLOP
COMP
THRESHOLD
CONTROL_V
OUTPUT
TRIGGER
RESET
DISCHARGE
U14:1 LM556-SMT
N441
N442
N443
P1
-MID-RAIL
-HI-RAIL
4V NOM
OFF-BUS VOLTAGESRISES
ONLY AFTER V-BIAS > 10V.
ENSURES THAT 556-TRIG
PIN STARTS LOW.
SET NOM PEAK AT 13V, 120VAC
DECLINES ABOUT 30% EVERY 35 MS
REACHES 8.7V IN 40 MS, (2 AC CYCLES)
974K - 24.9K RES DIVIDER
340V NOM BUS = 8.67V
200V MIN BUS = 5.1V UV
NOM BUS VOLTAGE340V (120-240VAC)
MIN BUS VOLTAGE 200-220V (75-150 VAC)
N408
NON CRIT BYPASS
TIME DELAY
3 SECONDS
UNDERVOLTAGE SHUTDOWN
TRIGGERS AT 5.1 V-REF
RESETS AT 5.6V (10% HYST)
5V NOM
0.5-1 MA TO TRIGGER
5V NOM
600V TRACE
100PF @ 15KV ESD
100NF @ 15V BYPASS
+6 V
R343
100K
^R_1206
PARALLEL WINDING ON
RESONANT INDUCTOR
R342
100K
^R_1206
FROM DC SHUTDOWN,
SHEET 4
TO SH 4
SH 4
RELAY 25MA
+18V
AC-LO
X-CAPS, 3 PL
CH-GND
STUD
RELAY STARTS OFF LOW. 5V LINE
SETTLES HIGH BEFORE 16V > 8V,
BECAUSE TRIG IS LOW UP TO 10V
AC-HI
120, 240V
LINE FILTER SHIELD
2
AC1
1
+
4
-
3
AC2
BR1
600V-50A
N385
TRANSFORMER
QUIET END
J120
120V, PAR
RECT DIODES
240V, FULL
WAVE RECT
120V, VOLT
DOUBLER
IGBT HEAT SINK
XF-BIAS
+16V
C162
.1-50V-10%
^C_1206
USE THRU HOLE,
HIGHER WATTAGE
2 BEADS IN PAR HI RAIL
1 BEAD LO RAIL
G
CE
Q96
IRG4PC40
+18V
+HI-RAIL
R365
15.0K
^R_0805
SMT-B PKG OK
NEW, LO-ESR, 2PL
TO TURN-OFF MUTING
SHEET 4 (FAN SPEED)
NONE
SH-001203-00
SH-001203-00
5OF5
5
B
B
plx1202a.sch
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