QSC EX-4000 Schematic

4.3 (3)

SCHEMATIC, AMPLIFIER CHANNEL, EX 4000-B

U 906

HIGH RAIL

+142 V RAIL

J 901

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

IC-000008-00

J 904

SCHMIDTT COMPARATOR

C 933

J 903

GATE

R 901

22 FP

C 934

18 Vac

D 938

1N4004

+24 V UNREG

+24 V

D 937

15000-50V

LOSS-OF-SAT

1N4004

B 901

GATE DRIVER

2 PL

D 942

1N4004

+15 V REG

U 904

7815

SHUTDOWN

R 902

22 FP

Q 901

+15 V

D 941

1N4004

-15 V REG

C 954

C 945

18 Vac

SOURCE REF

Q 902

-15 V

100

D 940

2200

D 947

1N4004

-24 V UNREG

25 V

1N4746, 18V

35V

-24 V

C 901

R 903

REF VOLT

LOW RAIL

SHUTDOWN

SLEW

NEG SUPP

BOOTSTRAP CAP

.10

2.7-2W

D 939

D 936

C 953

C 946

1N4746, 18V

1N4004

100

2200

XF PTC

25 V

35V

C 903 47-50V

R 911 22K-1W

D 901

XF PTC

MUR1510

C 941

R 982

U 905

7915

10-25V

470-1W

J 902

+94 V RAIL

GND

-24 V

U 907

HIGH RAIL

RELAY DR

IC-000008-00

MUTING INPUT CAP.

U 910

SCHMIDTT COMPARATOR

ON-OFF MUTING DELAY

GATE

R 906

22 FP

T 1

IC-000010-00

THERMAL

C 931

C 943

C 932

SHUTDOWN MUTING

47-35V

LOSS-OF-SAT

TIMING CAP.

GATE DRIVER

15000-50V

T 2

RELAY

MUTING BUS

SHUTDOWN

R 904

22 FP

C 944

2 PL

GROUND

Q 903

47-35V

MUTE -24V

MUTE +8V

SOURCE REF

T 3

RUN +15V

RUN 0V

R 1007

Q 904

RELAY

PTC-60C

DRIVER

R 910

C 902

T 4

BH-100

REF VOLT

LOW RAIL

SHUTDOWN

SLEW

NEG SUPP

BOOTSTRAP CAP

2.7-2W

.10

MUTE BUS

THERMALLY

MUTE

T 5

CONNECTED

D 902

TO +15V

TO Q 911

C 904 47-50V

THERM ADJUST, 0.5-8.5V

R 917 22K-1W

MUR1510

R 987

T 6

D 951

330K

R 989

THERMAL SENSE, 0-8V

THERMAL SENSING

50C +O.5V

7.5V

60.4K

PROCESSING BUFFER

90C +8V

+46 V RAIL

T 7

THERMAL BUS, 0-8V

SPEAKER BUS

C 963

+46 +94 +142 V SWITCHED BUS

THERMAL

T 8

J 905-3

.0022uF

J 905-6

200V

R 996

OP-AMP OUT - HF PROTECT

SHUTDOWN DETECTORS

R 927

R 924

R 925

R 928

R 926

R 930

R 929

C 929

C 952

T 9

THERMAL

22-1W

27K

.22-3W

C 930

220-16NP

DC PROTECT SENSE

HIGH FREQ

VR 901

6 PL

TO MUTING

T10

DC RECTIFIER

100

U 902-A

R 1002

D 907

2 PL

TRANSFORMER

BIIAS

5532

R 931

D 921

Q 905

Q 906

Q 907

Q 908

Q 909

Q 910

15000-50V

CENTER TAP

R 994

THERMAL LIMITING

C 956

1N5402

1N5956B

10K-2W

T11

CLIP RECTIFIER-BUFFER

50 OHM

220p

U 902-B

R 947

200 V

Q 933

25 C

+15 V

R1001

2SA1302

L 901

2uH

OP-AMP OUT

LIMITING THRESHOLD +4.5V

332

IDLE -1.2V

15K

2SC3298B

6 PL

T12

0-3Vac NORMAL AUDIO

CLIP +3V PEAKS

SPEAKER

4.5-6.5Vac CLIPPING PEAKS

MUTE +4.5V

SWITCHING THRESHOLD

R 943

R 945

R 937

OPTOCELL

AUDIO OUTPUT STAGE

R 933

C 911

OUTPUT

REFERENCE

750K

4.7-1W

HEATSINK

T13

D 923

.01

-15 V

GROUND

D 922

1N4148

R 934

CLIP BUS

1N4148

10-2W

R 935

CLIP

T14

D 903

R 938

R 939

R 995

C 955

R 944

R 946

4 PL

1N4004

4.7-1W

4.7 FP

R 932

R 936

+15 V

BIAS NETWORK

2.7K

.0022

750K

TO +15 V

3.9-2W

T15

RN 910

Q 934

2SC3281

C 913

J 905-1

C 961

R 948

SPEAKER

-15 V

1K-4

2SA1306B

6PL

C 912

.10

TO -15 V

COMMON

.0033

332

D 924

C 960

T16

1N5956B

Q 911

Q 912

Q 913

Q 914

Q 915

Q 916

470-10V

D 904

D 908

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

200 V

1N4004

IN5402

T17

NEGATIVE CURRENT FEEDBACK, -3V PEAK

NEGATIVE BIAS

C 935

R 955

R 949

R 950

R 952

R 951

R 953

R 954

C 936

R 976

T18

R 1000

CONTROLLER

22-1W

.22-3W

15000-50V

3K-2W

10K-2W

NEGATIVE TRIMMER

6 PL

J 905-8

2 PL

T19

-46 -94 -142 V SWITCHED BUS

D 965

VR 903

OUTPUT VOLTAGE FEEDBACK

LOAD IMPEDANCE

7.5V

-46 V RAIL

D 905

T20

BIAS ENABLE

R 956

MUR1510

+CURR LIM

SENSING

3K-2W

POS CURRENT TRIMMER

VR 902

T21

R 958

C 917

2.7-2W

.10

POSITIVE CURRENT FEEDBACK

+3V PEAK

POSITIVE BIAS

GATE PWR

-CURR LIM

T22

CONTROLLER

REF VOLT

LOW RAIL

SHUTDOWN

SLEW

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

T23

R 959

22 FP

NEGATIVE DRIVER, -0.6V IDLE

GATE

Q 917

J 905-2

T24

SCHMIDTT

C 959

LOSS-OF-SAT

C 937

COMPARATOR

GATE DRIVER

R 960

22 FP

470-10V

POSITIVE DRIVER, +0.6V IDLE

SHUTDOWN

Q 918

C 938

T25

15000-50V

C 924

D 906

SOURCE REF

GND

U 908

470-10V

MUR1510

2 PL

GND

IC-000009-00

GND

C 920

R 961

.10

2.7-2W

-94 V RAIL

R 988

10K-2W

SPEAKER BUS

R 962

SPKR SIG

3K-2W

GATE PWR

C 914

18p

REF VOLT

LOW RAIL

SHUTDOWN

SLEW

R 963

22 FP

Q 919

R 992

470-1W

C 951

R 940

Q 920

47-16NP

R 964

22 FP

GATE

30.0K-.5W

SCHMIDTT

LOSS-OF-SAT

C 939

COMPARATOR

GATE DRIVER

SHUTDOWN

C 921

C 940

R 990

R 993

C 916

R 942

SOURCE REF

470-10V

15000-50V

6.8K

412

75K

U 909

2 PL

.15

SCHEDULE OF TEST POINTS

J 905-1

THRU

J 905-8

HEAVY LINE SHOWS

RN 909

R 941

IC-000009-00

-142 V RAIL

MAIN SIGNAL PATH

10K-4

J 905-1 NEGATIVE LIMITING VOLTAGE

+INPUT

C 915

J 905-2 POSITIVE LIMITING VOLTAGE

J 905-4

NOTES.

.0022

J 905-3 SWITCHING THRESHOLD REFERENCE VOLTAGE

+15 V

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

U 903

J 905-4 AMPLIFIER LOOP OPAMP OUTPUT

VTL 5C4

U 901-A

2. ALL CAPACITORS 100V UNLESS NOTED.

U 901-B

J 905-6 SWITCHED POS AMPLIFIER RAIL--HIGH VOLTAGE

TOLERANCE 20% FOR ELECTROLYTIC TYPES, 10% ON OTHER TYPES.

AUDIO INPUT STAGE

5532

D 952

J 905-8 SWITCHED NEG AMPLIFIER RAIL--HIGH VOLTAGE

D 954

R 991

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

1N4735

1N4148

590

6.2 V

4. R 1007 IS POSITIVE TEMPERATURE COEFFICIENT RESISTOR MOUNTED TO HEAT SINK.

-15 V

PART NUMBERING SCHEDULE FOR PCBS USED IN EX-4000:

RESISTANCE 100 OHM COLD, RISING AT 55 C. QSC P/N RE-000006-PT

GND REF

D 955

PCB NUMBER

DESCRIPTION

CH 1 PARTS

CH 2 PARTS

PARTS IN COMMON

5. Q 901-904, 917-920 ARE SWITCHING FETS. QSC P/N QD-000013-QD OR QD-000031-QD.

1N4735

D 953

PC-004001-00

DISPLAY PCB

101-199

201-299

1-29

125 W, 60 V MINIMUM, ON-RESISTANCE 0.030 OHMS MAX.

6.2 V

C 962

R 923

1N4148

UNLESS OTHERWISE SPECIFIED

PC-004002-00

INPUT PCB

301-399

401-499

31-49

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

10 pF

47K-1W

DIMENSIONS ARE IN INCHES.

C 957

PC-004003-00

AC PCB

501-599

601-699

51-69

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

PWR-ON

TO +46 V RAIL

DIMENSIONS PER ANSI Y14.5-1982

68 p

PC-004004-00

SPKR PCB

701-799

801-899

71-99

8. PARTS MARKED WITH TRIANGLE

MUST BE REPLACED WITH EXACT TYPE ONLY.

TOLERANCES ARE:

PC-004200-00

AMP CHANNEL

901-UP (SAME BOARD FOR CH 1, CH2)

9. PARTS ENCLOSED WITHIN DOTTED OUTLINE

HAVE VOLTAGES GREATER THAN 42V.

DECIMALS

10. Q 933 AND Q 934 MUST BE INSULATED FROM THIER HEATSINK (WHICH ARE CONNECTED TO GROUND).	.XX + .02	.XXX + .010
	-	-

DEBURR EDGES .XXX R MAX

ANGLES

+- 1/2

LG.

AUDIO PRODUCTS, INC.

SCHEMATIC EX 4000B

	WP-004202-01	SVC CH MOD	SGM	11-01-91		AMPLIFIER CHANNEL
			SGM	11-01-91

	WP-004202-00	EX 4000B	SG MORALES	6-22-94	D	SH-004000-00	U
NOTES: UNLESS OTHERWISE SPECIFIED			SG MORALES	6-22-94
NOTES: UNLESS OTHERWISE SPECIFIED	NEXT ASSY	USED ON
	APPLICATION		SH4000T1.FCD		NONE	SH4000U1.FCD

U 1 00-0040000-SH

THIS DOCUMENT CONTAINS PROPRIETARY

REVISIONS

INFORMATION WHICH IS THE PROPERTY

ZONE

REV

DESCRIPTION

DATE

APPROVED

OF QSC AUDIO PRODUCTS

, THAT MAY NOT

A PROD RELEASE PER ECO 2297 WR

BE DISCLOSED, REPRODUCED OR USED

WITHOUT EXPRESS WRITTEN CONSENT FROM

QSC AUDIO PRODUCTS.

TAB BLOCK

DASH NO.

DESCRIPTION

USED ON

-00

CHAN 1 & 2

MPA1100, MPX1200, EX 4000

-01

CHAN 1

MPA750, EX 2500

-02

CHAN 2

MPA750, EX 2500

PARTS LIST

UNLESS OTHERWISE SPECIFIED

CONTRACT NO.

AUDIO PRODUCTS, INC.

DIMENSIONS ARE IN INCHES.

DIMENSIONS PER ANSI Y14.5-1982

COSTA MESA, CALIFORNIA

TOLERANCES ARE:

DECIMALS

ANGLES

.XX + .02

.XXX

+ .010

1/2 O

APPROVALS

DATE

SCHEMATIC, BRIDGE

DEBURR EDGES .XXX R MAX

DRAWN

Warren R.

5-13-94

RECTIFIER PCB

MATERIAL

CHECKED

FINISH

ISSUED

SIZE

FSCM NO.

DWG NO.

REV

SH-000040-XX

NOTES: UNLESS OTHERWISE SPECIFIED

NEXT ASSY

USED ON

CAD SEED FILE NO.

APPLICATION

DO NOT SCALE DRAWING

SCALE

NONE

CAD FILE NO.

SH0040A1.FCD

SHEET

1 OF 1

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