QSC EX-1600 Schematic

SCHEMATIC, 2-CH POWER AMPLIFIER, EX 1600

REV K, FOR PC-004105-00 REV D

DOC NO. SH-004101-00

SHEET 1, HOUSEKEEPING SUPPLY AND FAN SPEED CONTROL

+24 V

1

3

+15 V

4

-15 V

2

-24 V

SCHEDULE OF TEST POINTS ETCJ 502-1

CH-1 CH 2

J 502-1 J 602-1 NEGATIVE LIMITING VOLTAGE
J 502-2 J 602-2 POSITIVE LIMITING VOLTAGE
J 502-3 J 602-3 SWITCHING THRESHOLD REFERENCE VOLTAGE
J 502-4 J 602-4 AMPLIFIER LOOP OPAMP OUTPUT
J 502-6 J 602-6 SWITCHED POS AMPLIFIER RAIL--HIGH VOLTAGE
J 502-8 J 602-8 SWITCHED NEG AMPLIFIER RAIL--HIGH VOLTAGE

PART NUMBERING SCHEDULE FOR PCBS USED IN EX-1600:

PCB NUMBER DESCRIPTION CH 1 PARTS CH 2 PARTS PARTS IN COMMON
PC-004001-00
PC-004002-00
PC-004105-00
PC-004105-00
PC-004105-00

DISPLAY PCB
INPUT PCB
AMP PCB
SPKR PCB
AC PCB

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)

+24 V UNREG

+15 V REG

-15 V REG

-24 V UNREG

+23V 0N/OFF ENABLE TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL

U 52

7815

321

100
35 V

C 55
100 2200

35 V

D 53

1N4746, 18V

D 52

1N4746, 18V

32

1

U 51

C 53C 56

2200

C 54

7915

+23V 0N/OFF ENABLE TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL

TO SHEET 2

R 53

AUDIO AND POWER GROUNDS

J 51

XF PTC

5

4

XF PTC

18 Vac

D 51

1N4004

35V

35V

BR 51

TO SHEET 3

1

18 Vac

2

CT

3

D

C

RN 51

2.7K

2.7K

-24 V

180K

R 52

C 52

47-10NP

Q 52
2N2907

Q 53

2N4410

2.7K

A

2.7K

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 BR 51, 1.5A, 100V.

4. R 598, 698 IS POSITIVE TEMPERATURE COEFFICIENT RESISTOR MOUNTED TO HEAT SINK.
RESISTANCE 100 OHM COLD, RISING AT 55 C. QSC P/N RE-000006-PT

5. Q 503, 504, 603, 604 ARE SWITCHING FETS. QSC P/N QD-000031-QD.
125 W, 60 V MINIMUM, ON-RESISTANCE 0.030 OHMS MAX.

6. ZENERS D 503, 504, 603, 604 MARKED 7.5 V TESTED FOR LOW LEAKAGE, QSC P/N QD-0007.5-ZT.

7. ZENERS D 509, 513, 609, 613, 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.

R 51

47K

C 57
.01

B

2SC3298B

C 51
100-35V

Q 51

J 52-1

FAN RED

24 V BRUSHLESS FAN

FAN BLACK

J 52-4

3.3-1W

HEAT SINK GROUND

A

LAST USED REF. DESIGN.
BR 51, BR 502, 602

C51 - 57, C534, 634
D51 - 53, D513, 613
F504, 604
J51, 52, J503, 603
K501, 601
L501, 601
Q51 - 53, Q510, 610
R51 - 53, R544, 644, R598, 698, R599, 699
RN51, RN502, 602
U51, 52, U506, 606
VR503, 603

NOTES: UNLESS OTHERWISE SPECIFIED

WP-004101-00

APPLICATION

EX 1600

USED ONNEXT ASSY

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

TOLERANCES ARE:

DECIMALS

.XX .XXX

DEBURR EDGES .XXX R MAX

+

+

-

-

SH-004101-00

1
K

AUDIO PRODUCTS, INC.

ANGLESDECIMALS

+

-

SCHEMATIC DIAGRAM

EX 1600

D

SH-004101-00

SH4101K1.FCDNONE

K

SCHEMATIC, EX-1600, SHEET 2, AMPLIFIER CHANNEL ASCHEMATIC, EX-1600, SHEET 2, AMPLIFIER CHANNEL A

C 516 R 531

470-1W

D 512
1N400410-25V

TO -24 V

MUTE

THERMAL

GND
GND
GND

SPKR SIG

GND REF

PWR-ON

14-PIN RIBBON

J 503

CLIP

+INPUT

AUDIO INPUT STAGE

10

R 543
330K

8

C 517

220-10NP

R 527

10K-2W

11

C 518

470-10V

R 529
10K-2W

VR 502
5K
+ CURR LIM+ CURR LIM

VR 503

5K

- CURR LIM- CURR LIM- CURR LIM

C 513

470-10V

6

5

12

13

HEAVY LINE SHOWS
MAIN SIGNAL PATH

14

9

7

J 502-1

J 502-2

R 528

7.5K-2W

R 533

47K-1W

R 530

470-1W

A

U 504
VTL 5C4

R 544
27K

A

TO +15V

R 532, 47K

TO +54 V RAIL

C 514

47-50V

C 515

47-50V

TO +15 V

TO -15 V

SPEAKER BUS

A

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

C 524

47-10NP

A

RN 501
10K-4

U 506-B

R 597

5532

1.5 K

BA

1K

+15 V

8

5

6

4

-15 V

DC

68 p

ON-OFF MUTING DELAY

SHUTDOWN MUTING

THERMAL
HIGH FREQ
DC RECTIFIER

MUTING BUS
MUTE +8V
RUN 0V

RELAY
MUTE -24V
RUN +15V

THERMAL SENSING
PROCESSING BUFFER

CLIP RECTIFIER-BUFFER

LIMITING THRESHOLD +4.5V

4.5-6.5Vac CLIPPING PEAKS MUTE +4.5V

LOAD IMPEDANCE

SENSING

C 522

18p

R 540

21.5K-.5W

R 538R 536 R 537

C 521

75K

.12

C 520

.0022

R 539

47

3
2

1

C 526
15 p

D 509
1N 4148

7

C 525

464

A

U 506-A

R 541

590

50C +O.5V

90C +8V

SHUTDOWN DETECTORS

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

NEGATIVE BIAS
CONTROLLER

BIAS ENABLE

POSITIVE BIAS
CONTROLLER

D 510

D 513

1N4735

6.2 V

1N 4148

D 511

1N4735

TO MUTING

6.2 V

U 503

IC-000010-00

J 502-4

+23V 0N/OFF ENABLE

TO SHEET 1

U 501
IC-000008-00

SCHMIDTT COMPARATOR

REF VOLTT2LOW RAIL

T1

D 504

7.5V

J 502-3 J 502-6

VR 501
100

BIAS

BIAS

R 599

50 OHM

25 C

C 504
.01

D 505

1N4004

BIAS

NETWORK

C 512

.0033

D 506

1N4004

R 598
PTC-60C

THERMALLY
CONNECTED
TO Q 508

TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL

U 505-B

D 503

7.5V

C 519

+15 V
8

5

6

4

-15 V

R 534 C 523

2.7K

A

T1

REF VOLT

SCHMIDTT
COMPARATOR

U 502
IC-000009-00

680p

7

SWITCHING THRESHOLD

.0022

T2

REFERENCE

-54 V RAIL

LOW RAIL

+54 V RAIL

U 505-A

5532

R 535
15K

C

D

1

RN 502

1K-4

LOSS-OF-SAT

SHUTDOWN

3

2

A

T3

LOSS-OF-SAT

SHUTDOWN

SHUTDOWN

T3

SPEAKER BUS

B

SHUTDOWN

GATE DRIVER

SLEW NEG SUPPT6BOOTSTRAP CAP

T4

R 508

332

R 503 R 506

1.5K

750K

R 501 R 505

1.5K

750K

R 507

332

T4

SLEW

GATE DRIVER

T5

J 502-8

R 519
22-1W

R 518
22-1W

HIGH RAIL

GATE

SOURCE REF

C 502 47-50V

R 513 22K-1W

R 520 R 521 R 522

Q 508 Q 509 Q 510

Q 502

2SC3298B

R 504

4.7-1W

R 502

4.7-1W

Q 501
2SA1306B

AUDIO OUTPUT STAGE

Q 505 Q 506 Q 507

R 516 R 515 R 517

GATE PWR

GATE

SOURCE REF

SOURCE REF

+108 V RAIL

T9

T8

T7

+54 +108 V SWITCHED BUS

2SA1302

3 PL

2SC3281

3 PL

-54 -108 V SWITCHED BUS

T5

T6

T7

-108 V RAIL

.22-3W

3 PL

.22-3W

3 PL

R 514
3K-2W

C 505
470-10V

R 511

R 510

22 FP

22 FP

D 508

1N5402

D 507
IN5402

D

GS

R 512 C 503

2.7-2W .10

HEATSINK
GROUND

C 507

.10

R 509 C 501

2.7-2W

D

GS

Q 504

D 502

MUR 810

D 501

MUR 810

Q 503

R 524

3.9-2W

.10

C 509

12000-63V

C 511

12000-63V

L 501

R 525

5.6-2W

C 510

12000-63V

C 508
12000-63V

C 527

.047-400A

C 529 C 530

.047-400A .047-400A

C 531 C 532

.047-400A .047-400A

C 533 C 534

.047-400A .047-400A

2uH

TO -24 V

R 523

5.6-2W

C 506
.10

R 526
3K-2W

TO RECT BR 501

R 542
47K-1W

TO -15V

TO RECT BR 502

TO -108 V RAIL

TO -54 V RAIL

K 501

BR 502

BR 501

C 528

.047-400A

NO

NC

SPEAKER
OUTPUT

SPEAKER
COMMON

15A-125V

15A-125V

15A-125V

15A-125V

F 502

F 504

F 501

F 503

J 52-5

J 501

6-PIN MATE-LOK

3

4

6

1

TRANSFORMER
CENTER TAP

2

5

J 52-6

SH-004101-00

2
K

D

SH-004101-00 K

SH4101K2.FCD

+24 V
+15 V

-15 V

-24 V

J 603

1

3

4

2

14-PIN RIBBON

N.C.

N.C.

N.C.

N.C.

SCHEMATIC, EX-1600, SHEET 3, AMPLIFIER CHANNEL BSCHEMATIC, EX-1600, SHEET 3, AMPLIFIER CHANNEL B

TO -24 V

1N4004

C 616
10-25V

R 631

470-1W

+23V 0N/OFF ENABLE TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL

TO SHEET 1

R 698D 612
PTC-60C

THERMALLY
CONNECTED
TO Q 607

MUTE

CLIP

GND
GND
GND

SPKR SIG

+INPUT

AUDIO INPUT STAGE

GND REF

PWR-ON

10

R 643
330K

8

220-10NP

10K-2W

11

J 602-1

C 618

470-10V

R 629
10K-2W

VR 602
5K
+ CURR LIM+ CURR LIM

VR 603

5K

- CURR LIM- CURR LIM

C 613

470-10V

J 602-2

6

5

12

R 628

7.5K-2W

13

HEAVY LINE SHOWS
MAIN SIGNAL PATH

14

9

47K-1W

7

C 617

R 627

470-1W

A

U 604
VTL 5C4

R 633

R 630

A

TO +15V

R 632, 47K

R 644
27K

TO +54 V RAIL

C 614

47-50V

C 615

47-50V

TO +15 V

TO -15 V

SPEAKER BUS

A

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

C 624

47-10NP

R 636

1.5 K

A

RN 601
10K-4

B

R 697

+15 V

1K

8

5

U 606-B

5532

7

6

4

-15 V

D

C 625
68 p

ON-OFF MUTING DELAY

SHUTDOWN MUTING

THERMAL
HIGH FREQ
DC RECTIFIER

MUTING BUS
MUTE +8V
RUN 0V

RELAY
MUTE -24V
RUN +15V

THERMAL SENSING
PROCESSING BUFFER

CLIP RECTIFIER-BUFFER

LIMITING THRESHOLD +4.5V

4.5-6.5Vac CLIPPING PEAKS MUTE +4.5V

LOAD IMPEDANCE

SENSING

18p

C 622

R 640

A

R 641

U 606-A

590

21.5K-.5W

R 638

75K

3
2

C 626
15 p

C 621

C 620

.0022

.12

R 639

47

1

R 637

464

A

C

50C +O.5V

90C +8V

SHUTDOWN DETECTORS

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

NEGATIVE BIAS
CONTROLLER

POSITIVE BIAS
CONTROLLER

D 613

1N4735

6.2 V

D 609
1N 4148

TO MUTING

BIAS ENABLE

D 610
1N 4148

D 611

1N4735

6.2 V

U 603

IC-000010-00

J 602-4

R 699

50 OHM

25 C

C 604

.01

BIAS NETWORK

VR 601
100
BIAS

BIAS

D 605

1N4004

C 612

D 606

1N4004

.0033

D 604

7.5V

U 605-B

D 603

7.5V

5

6

U 601
IC-000008-00

SCHMIDTT COMPARATOR

REF VOLTT2LOW RAIL

T1

C 619

680p

+15 V
8

7

4

-15 V

R 634 C 623

A

2.7K

T1

REF VOLT

SCHMIDTT
COMPARATOR

U 602
IC-000009-00

+54 V RAIL

U 605-A

5532

1

R 635
15K

SWITCHING THRESHOLD

REFERENCE

C

D

.0022

RN 602

1K-4

-54 V RAIL

T2

LOW RAIL

LOSS-OF-SAT

SHUTDOWN

T3

SPEAKER BUS

3

2

B

A

T3

LOSS-OF-SAT

SHUTDOWN

SHUTDOWN

SHUTDOWN

GATE DRIVER

SLEW NEG SUPPT6BOOTSTRAP CAP

T4

R 608

332

R 603

R 606

1.5K

750K

R 601

R 605

1.5K

750K

R 607

332

T4

SLEW

GATE DRIVER

T5

J 602-6J 602-3

J 602-8

R 619
22-1W

R 618
22-1W

HIGH RAIL

GATE

SOURCE REF

C 602 47-50V

R 613 22K-1W

R 620 R 621 R 622

Q 608 Q 609 Q 610

Q 602

2SC3298B

R 604

4.7-1W

R 602

4.7-1W

Q 601
2SA1306B

Q 605 Q 606 Q 607

R 616 R 615 R 617

GATE PWR

GATE

SOURCE REF

SOURCE REF

+108 V RAIL

T9

T8

T7

+54 +108 V SWITCHED BUS

2SA1302

3 PL

AUDIO OUTPUT STAGE

2SC3281

3 PL

-54 -108 V SWITCHED BUS

T5

T6

T7

-108 V RAIL

R 611 Q 604

22 FP

GS

2.7-2W .10

.22-3W

3 PL

D 608

1N5402

HEATSINK
GROUND

C 607

D 607
IN5402

.22-3W

3 PL

R 614
3K-2W

R 610

22 FP

GS

C 605
470-10V

D

R 612 C 603

D 602

MUR 810

R 624

3.9-2W

.10

D 601

MUR 810

R 609

2.7-2W

C 601

.10

D

Q 603

C 609

12000-63V

C 611

12000-63V

L 601

R 625

5.6-2W

C 610

12000-63V

C 608
12000-63V

C 627 C 628

.047-400A

C 629 C 630

.047-400A .047-400A

C 631 C 632

.047-400A .047-400A

.047-400A .047-400A

2uH

TO -24 V

R 623

5.6-2W

C 606
.10

R 626
3K-2W

TO RECT BR 601

R 642
47K-1W

TO -15V

TO RECT BR 602

BR 602

TO -108 V RAIL

TO -54 V RAIL

K 601

D

BR 601

.047-400A

C 634C 633

NO

NC

SPEAKER
OUTPUT

SPEAKER
COMMON

F 602

15A-250V

F 604

15A-250V

F 601

15A-250V

F 603

15A-250V

J 52-2

J 52-3

J 601

6-PIN MATE-LOK

3

4

6

1

TRANSFORMER
CENTER TAP

2

5

SH4101K3.FCD

SH-004101-00

3
K

KSH-004101-00