QSC EX-4000 Schematic

SCHEMATIC, AMPLIFIER CHANNEL, EX 4000-B

SCHEMATIC, AMPLIFIER CHANNEL, EX 4000-B

REV U, 2-15-95, FOR PC-004200-00 REV K

J 903

D 938

C 941
10-25V

220-16NP

10K-2W

J 905-1

R 1000
10K-2W

J 905-2

10K-2W

D 942
D 941
D 947

C 952

R 994

R 988

R 992

470-1W

A

R 987
330K

1N4004
1N4004
1N4004
1N4004

R 996

27K

D 936
1N4004

R 982

470-1W

C 943

47-35V

C 944

47-35V

TO +15V

R 989

60.4K

TO +15 V

TO -15 V

SPEAKER BUS

MUTING INPUT CAP.

T 1

TIMING CAP.

T 2

GROUND

T 3

RELAY
DRIVER

T 4

MUTE BUS

T 5

THERM ADJUST, 0.5-8.5V

T 6

THERMAL SENSE, 0-8V

T 7

THERMAL BUS, 0-8V

T 8

OP-AMP OUT - HF PROTECT

T 9

DC PROTECT SENSE

T10

THERMAL LIMITING

T11

OP-AMP OUT

T12

OPTOCELL

T13

CLIP BUS

T14

+15 V

T15

-15 V

T16

NEGATIVE BYPASS, -7.5V NORMAL, -2.5V SHORT

T17

NEGATIVE CURRENT FEEDBACK, -3V PEAK

T18

NEGATIVE TRIMMER

T19

OUTPUT VOLTAGE FEEDBACK

T20

POS CURRENT TRIMMER

T21

POSITIVE CURRENT FEEDBACK +3V PEAK

T22

POSITIVE BYPASS, +7.5V NORMAL, +2.5V SHORT

T23

NEGATIVE DRIVER, -0.6V IDLE

T24

POSITIVE DRIVER, +0.6V IDLE

T25

+24 V
+15 V

-15 V

-24 V

MUTE

THERMAL

CLIP

GND
GND
GND

SPKR SIG

470-10V

VR 902

C 959

470-10V

1

3

4

2

10

8

11

C 960

VR 903
5K
+CURR LIM

+CURR LIM

5K

-CURR LIM

-CURR LIM

6

5

12

13

A

+INPUT

AUDIO INPUT STAGE

HEAVY LINE SHOWS
MAIN SIGNAL PATH

14

U 903
VTL 5C4

RN 909
10K-4

BA

U 901-B

5532

A

9

GND REF

PWR-ON

R 923

47K-1W

7

TO +46 V RAIL

NOTES: UNLESS OTHERWISE SPECIFIED

C 951

47-16NP

A R 990 R 993

6.8K 412

+15 V

8

5

6

4

-15 V

DC

C 957
68 p

+24 V UNREG

+15 V REG

-15 V REG

-24 V UNREG

C 954
100

25 V

C 953
100

25 V

ON-OFF MUTING DELAY

SHUTDOWN MUTING

RELAY
MUTE -24V
RUN +15V

THERMAL SENSING
PROCESSING BUFFER

THERMAL
HIGH FREQ
DC RECTIFIER

MUTING BUS
MUTE +8V
RUN 0V

LIMITING THRESHOLD +4.5V

4.5-6.5Vac CLIPPING PEAKS MUTE +4.5V

LOAD IMPEDANCE

SENSING

18p

C 914

R 940

30.0K-.5W

R 942

C 916

75K

.15

A

3

U 901-A

R 991

2

1

590

C 962

10 pF

7

7815U 904

D 940

1N4746, 18V

D 939

1N4746, 18V

32

1

50C +O.5V

90C +8V

SHUTDOWN DETECTORS

CLIP RECTIFIER-BUFFER

IDLE -1.2V
CLIP +3V PEAKS0-3Vac NORMAL AUDIO

NEGATIVE BIAS
CONTROLLER

POSITIVE BIAS
CONTROLLER

R 941

47

C 915

J 905-4

.0022

D 952

D 954

1N4735

1N4148

6.2 V

D 955

1N4735

D 953

1N4148

321

TO MUTING

BIAS ENABLE

6.2 V

J 904

1

D 937

1N4004

C 945

2200

35V

C 946
2200

35V

7915U 905

U 910

IC-000010-00

R 931

50 OHM

25 C

C 911

.01

BIAS NETWORK

B 901

R 1007
PTC-60C

BH-100

THERMALLY
CONNECTED
TO Q 911

J 902

2

3

4

5

1

4

3

2

VR 901
100
BIAS

BIAS

D 903

1N4004

C 961

D 904

1N4004

18 Vac

18 Vac

CT

XF PTC
XF PTC

GND

-24 V
RELAY DR
THERMAL

.0033

SCHEDULE OF TEST POINTS J 905-1 THRU J 905-8

J 905-1 NEGATIVE LIMITING VOLTAGE
J 905-2 POSITIVE LIMITING VOLTAGE
J 905-3 SWITCHING THRESHOLD REFERENCE VOLTAGE
J 905-4 AMPLIFIER LOOP OPAMP OUTPUT
J 905-6 SWITCHED POS AMPLIFIER RAIL--HIGH VOLTAGE
J 905-8 SWITCHED NEG AMPLIFIER RAIL--HIGH VOLTAGE

PCB NUMBER DESCRIPTION CH 1 PARTS CH 2 PARTS PARTS IN COMMON
PC-004001-00
PC-004002-00
PC-004003-00
PC-004004-00
PC-004200-00

DISPLAY PCB
INPUT PCB
AC PCB
SPKR PCB
AMP CHANNEL

101-199 201-299 1-29
301-399 401-499 31-49
501-599 601-699 51-69
701-799 801-899 71-99
901-UP (SAME BOARD FOR CH 1, CH2)

D 951

7.5V

U 902-B

D 965

7.5V

J 905-3

U 906
IC-000008-00

SCHMIDTT COMPARATOR

REF VOLTT2LOW RAIL

T1

U 907
IC-000008-00

SCHMIDTT COMPARATOR

REF VOLTT2LOW RAIL

T1

C 956

220p

+15 V
8

5

6

4

-15 V

R 995 C 955

A

2.7K

T1

REF VOLT

SCHMIDTT
COMPARATOR

U 908
IC-000009-00

T1

REF VOLT

SCHMIDTT
COMPARATOR

U 909
IC-000009-00

SPEAKER BUS

7

SWITCHING THRESHOLD

.0022

T2

T2

HIGH RAIL

T9

GATE

SOURCE REF

HIGH RAIL

GATE

SOURCE REF

T8

T7

T9

T8

T7

2SA1302

AUDIO OUTPUT STAGE

+94 V RAIL

+46 V RAIL

U 902-A

5532

R1001
15K

REFERENCE

1

C

D

RN 910

1K-4

LOSS-OF-SAT

SHUTDOWN

T3

LOSS-OF-SAT

SHUTDOWN

T3

3

2

B

A

SHUTDOWN

SHUTDOWN

C 963

.0022uF
200V

R 947

332

R 943
750K

R 944
750K1K1K

R 948

332

GATE DRIVER

SLEW NEG SUPPT6BOOTSTRAP CAP

T4

T5

GATE DRIVER

SLEW NEG SUPPT6BOOTSTRAP CAP

T4

T5

J 905-6

200 V

D 922

R 1002
47

D 923

1N4148

D 921

1N5956B

R 945

1N4148

R 946

D 924
1N5956B
200 V

C 903 47-50V

C 904 47-50V

R 927
22-1W

Q 905 Q 906 Q 907 Q 908 Q 909 Q 910
Q 933

2SC3298B

R 937

4.7-1W

R 938 R 939

4.7-1W

Q 934
2SA1306B
Q 911 Q 912 Q 913 Q 914 Q 915 Q 916

22-1W

J 905-8

-46 V RAIL

T3

LOW RAIL

-94 V RAIL

LOW RAIL

SHUTDOWN

LOSS-OF-SAT

SHUTDOWN

T3

SHUTDOWN

LOSS-OF-SAT

SHUTDOWN

NOTES.

1. ALL RESISTORS 1/4-WATT, 5% UNLESS NOTED.

2. ALL CAPACITORS 100V UNLESS NOTED.
TOLERANCE 20% FOR ELECTROLYTIC TYPES, 10% ON OTHER TYPES.

3. BRIDGE RECTIFIER B 901, 1.5A, 100V.

4. R 1007 IS POSITIVE TEMPERATURE COEFFICIENT RESISTOR MOUNTED TO HEAT SINK.
RESISTANCE 100 OHM COLD, RISING AT 55 C. QSC P/N RE-000006-PTPART NUMBERING SCHEDULE FOR PCBS USED IN EX-4000:

5. Q 901-904, 917-920 ARE SWITCHING FETS. QSC P/N QD-000013-QD OR QD-000031-QD.
125 W, 60 V MINIMUM, ON-RESISTANCE 0.030 OHMS MAX.

6. ZENERS D 951, 965 MARKED 7.5 V TESTED FOR LOW LEAKAGE, QSC P/N QD-0007.5-ZT.

7. ZENERS D 952, 955, 6.2V-500mW, TESTED FOR LOW LEAKAGE, QSC P/N QD-000024-QD.

8. PARTS MARKED WITH TRIANGLE MUST BE REPLACED WITH EXACT TYPE ONLY.

9. PARTS ENCLOSED WITHIN DOTTED OUTLINE HAVE VOLTAGES GREATER THAN 42V.

10. Q 933 AND Q 934 MUST BE INSULATED FROM THIER HEATSINK (WHICH ARE CONNECTED TO GROUND).

T4

SLEW

GATE DRIVER

T4

SLEW

GATE DRIVER

GATE PWR

GATE

SOURCE REF

SOURCE REF

GATE PWR

GATE

SOURCE REF

SOURCE REF

-46 -94 -142 V SWITCHED BUS

T5

T6

T7

T5

T6

T7

+142 V RAIL

R 901 22 FP

R 902 22 FP

R 911 22K-1W

R 906 22 FP

R 904

R 917 22K-1W

+46 +94 +142 V SWITCHED BUS

6 PL

4.7 FP

2SC3281

6PL

R 956
3K-2W

R 960 22 FP

C 924
470-10V

R 962
3K-2W

R 963

R 964

C 921
470-10V

-142 V RAIL

D

GS

D

Q 901

GS

Q 902

C 901

.10

D

GS

D

22 FP

R 930R 926R 928R 925R 924

22 FPR 959

22 FP

22 FP

GS

R 910

2.7-2W

R 929
.22-3W

6 PL

D 907

1N5402

HEATSINK
GROUND

C 912

D 908

IN5402

R 954R 953R 951R 952R 950R 949R 955
.22-3W

6 PL

MUR1510

R 958 C 917

2.7-2W

GS

D

GS

C 920 R 961

GS

D

GS

Q 903
Q 904

.10

D 905

D

Q 918
D 906

MUR1510

.10 2.7-2W

D

WP-004202-01 SVC CH MOD
WP-004202-00

APPLICATION

R 903

2.7-2W

D 901

MUR1510

D 902

MUR1510

3.9-2W

Q 917

Q 919

Q 920

C 902

R 932

.10

.10

C 933

C 934
15000-50V
2 PL

C 931

C 932
15000-50V
2 PL

15000-50V

L 901

R 933
R 934

C 935

C 936
15000-50V

2 PL

C 937

C 938

15000-50V

2 PL

C 939

C 940

15000-50V

2 PL

EX 4000B

USED ONNEXT ASSY

C 929
C 930

2 PL

2uH

10-2W

4 PL

C 913
.10

UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES.
DIMENSIONS PER ANSI Y14.5-1982

.XX .XXX

DEBURR EDGES .XXX R MAX

R 935
R 936

R 976
3K-2W

+

-

J 901

10

7

4

1

3

8

11

2

5

6

9

12

TOLERANCES ARE:

TRANSFORMER
CENTER TAP

SPEAKER
OUTPUT

SPEAKER
COMMON

DECIMALS

+

-

L

G.

SH-0040000-00

1
U

AUDIO PRODUCTS, INC.

ANGLESDECIMALS

O

1/2.02 .010

+

-

SGM

SG MORALES

11-01-91

6-22-94

D

SCHEMATIC EX 4000B

AMPLIFIER CHANNEL

NONE

SH-004000-00

SH4000U1.FCDSH4000T1.FCD

U

THIS DOCUMENT CONTAINS PROPRIETARY
INFORMATION WHICH IS THE PROPERTY
OF QSC AUDIO PRODUCTS
BE DISCLOSED, REPRODUCED OR USED
WITHOUT EXPRESS WRITTEN CONSENT FROM
QSC AUDIO PRODUCTS.

, THAT MAY NOT

4

3

2

1

REVISIONS

ZONE REV

DESCRIPTION

DATE

APPROVED

A PROD RELEASE PER ECO 2297 WR

D

C

D

C

B

B

TAB BLOCK

DASH NO. DESCRIPTION

-00 CHAN 1 & 2

-01

-02

CHAN 1
CHAN 2

MPA1100, MPX1200, EX 4000
MPA750, EX 2500
MPA750, EX 2500

USED ON

PARTS LIST

UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES.

A

NOTES: UNLESS OTHERWISE SPECIFIED

4

3

XX

USED ONNEXT ASSY

APPLICATION

DIMENSIONS PER ANSI Y14.5-1982

TOLERANCES ARE:

DECIMALS

.XX .XXX

+

-

DEBURR EDGES .XXX R MAX

MATERIAL

FINISH

+

-

DO NOT SCALE DRAWING

2

CONTRACT NO.

ANGLESDECIMALS

1/2.02 .010

+

-

O

APPROVALS

DRAWN

Warren R. 5-13-94

CHECKED

ISSUED

CAD SEED FILE NO.

DATE

SIZE

FSCM NO. DWG NO. REV

C

SCALE

NONE SH0040A1.FCD

AUDIO PRODUCTS, INC.

COSTA MESA, CALIFORNIA

SCHEMATIC, BRIDGE

RECTIFIER PCB

SH-000040-XX A

CAD FILE NO.

SHEET

A

1 OF 1

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