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8 7 6 5 4 3 2 1
REVISIONS
THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATION WHICH IS THE PROPERTY SCHEMATIC, MAIN PCB, POWERLIGHT 1.4 ZONE REV DESCRIPTION DATE APPROVED
OF QSC AUDIO PRODUCTS, THAT MAY NOT FOR FAB SEE PC-000152-00 REV A PROD RELEASE PER ECO 2548
BE DISCLOSED, REPRODUCED OR USED DOC NO. SH-000157-00 REV C A 1-25-95 SGM
(EFF. 1-27-95) AC
WITHOUT EXPRESS WRITTEN CONSENT FROM REVISED PER ECO 2601 AC
+15V B 3-1-95 SGM
QSC AUDIO PRODUCTS. (EFF. 3-1-95) AC
+15VIC CH1
REVISED PER ECO 2755 AC
+V C 7-21-95 SA
R528 (EFF. 6-30-95) AC
4 R563 R530
RN504:1 10K 270
OBSOLETE PER ECO 3244
1K 3 8 15-1/2W D5541N4004 +15VIC CH2
4.7K
C1
2 1 R552
(EFF. 9-27-96) AA
RN506:2
100K R550 RN505:2 RN505:4
5
10K 22K D635 Q515
22K 1N4004
D RN504:3
1K
R549
330K
R567
4.7K
R569
47K
R559
47K
(TO SHEET 3)
C534 D555 4 7
Q521
MPSW51
3 2N4410
D533
J53:1
D
Q513 R554 1N4746 -18V 1
MPS8599 100-35V 1N4148 Q520 +FAN
68K MPS8599 R531
6 A Q516 2 5
D532 2N4410 1.62K
(TO SHEET 3) D556 7.5V R566
390K RN506:1 RN506:3 C530
47-50V
7 D525 ! -15V 4.7K 4.7K
1N4148 1N4148 A
R555 R551 Q512 J53:2
D524 RN504:4 D526 R556 390K 390K MPS8599 LD704 2
-FAN
1N4004 1K 1N4004 PTC-60C D535 1 6
1N4004
D531 Q519 Q514
8 R553 R562 MPS8599 GREEN 7
MPSW01
A A 2.2K 2.2K 2 Q517
1N4148 D636 -15VIC CH1 RN506:4 MJE15030
RN505:1 RN505:3 1N4004 R564
Q511 R529 4.7K
(TO SHEET 2) 2N4410 22K 6 5
1K
C566 C535 15-1/2W A 8
.1 A 4.7-16V 1
22K
-15VIC CH2
A
J503
5
-15V
HIGH RAIL +80V RAIL
U501 ! T9
D
PROTECT
IC-000008-00 R505
22-1W Q504
(TO SHEET 3) SCHMIDTT COMPARATOR
GATE G
T8
4 LOSS-OF-SAT S !
GATE DRIVER
SHUTDOWN
R508 C505
2.7-2W .1-250V
SOURCE REF
T7
REF VOLT LOW RAIL SHUTDOWN SLEW NEG SUPP BOOTSTRAP CAP
R560
7.5K-2W T T T T T T
1 1 2 3 4 5 6
D502
R561 J502:2 R546 MUR810
536 C522 +15VIC CH1 3K-5W C504 TO SHEET 3
47-50V
47pF D510 R509
C A
22K-1W
C
RN502:2 RN502:1 IN4744A-15V
8 4 3 2 1
C526 D521 C506
330-25V R522 R507
10K 10K IN4744A-15V 1K 12K
R545 +15VIC CH1 .001
1K C536 D519
.1 P P
1N4934 +48V RAIL
8 D514
5 A
+ 4.7V
U503:B 7
5532 +40 +80V SWITCHED BUS
13 SIG. GND 6 C537
- J502:6
.1 TRANSFORMER
4
R518 R519 R520 R521
22-1W .22-3W
7 SIG. GND A 3 PL
R568 C519 !
-15VIC CH1 C532
A 953 18pF R548 TP16 TP15 TP14
D508 D513
RN502:4 4.7NP-16V 1N4934 1N5402 (SHEET 1 ZONE A5)
RN502:3 10K 450-5W
HEATSINK
9 5 6 7 8 C520 R538 VR501 GROUND
L501 2uH
47NP-10V C524 100 Q508 Q509 Q510
21.0K-.5W
10K BIAS
Q502 2SA1302
PWR GND CH1 -I LIM 2SC3298B 3 PL
J504
.022 ! C513 1
R524 SPEAKER
C521 P R511 HS GND CH1
P
R543 A VR502 2 OUTPUT CH1
50 OHM C 3.3-1W
47pF R540 R541 R542 25 C 2K 10-2W
11 C518