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BASS20

MECHANICAL PARTS LIST

REF. NO.

PART NO.

DESCRIPTION

QTY

1

BR1187

ALUM. BAR 4.8mmx12.7mmx40m

2

BR1387

ALUMINUM BAR 1.9"x0.5"x0.1

1

2

HS1102

HEAT SINK ASSY.

1

3

FH1002

FUSE HOLDER 1/4x1-1/4 (120V)

1

FH1003

FUSE HOLDER 5x20mm (230V)

1

4

SEE FUSES

5

LB1269

LABEL FOR HEATSINK (120V)

1

LB1298

LABLE FOR HEATSINK (230V)

1

7

MS1004

SILICONE GREASE #340 DOW

8

PM1366

GASKET FOR BASS20

1

9

TE1125

TERMINAL ULTRA FAST INS.

9

10

WI1637

WIRE #18 BLUE/WHITE TRACER

3"

11

SC1192

Sc 6-32x7/8 TAPT-THR HEX W

2

12

WA1049

WASHER EXT. TOOTH #6 ZINC

6

13

XX1250

STRAIN RELIEF SPT-1 BLACK

1

15

SC1215

SCREW M3x1.25x10 plas-Thr Pan

5

17

XX1174

AC CORD. 6FT UL/CSA APRO. (120V) 1

WI1597

AC CORD. 6FT UL/CSA APRO. (230V) 1

18

SP1020

SIL. FOAM 3/8"Lx1/4"Wx3/16

2

19

SP1073

SIL PAD TO-3P 1.0"x0.75"

4

20

XX1257

COVER PLASTIC

1

21

XX1259

KNOB BLACK CUSTOM

1

22

WA1032

WASHER PLAIN #6 ZINC FINISH

4

23

SC1194

Sc 6-32x3/8 TAPT-THR HEX

4

331364-001

GASKET

1

61868

Sc #8x3/4" Blk Pan Head Phillips

12

305718-001

FOOT

4

63868

INSERT THREADED (for foot)

332246-001

SUBWOOFER

2

900101-016

SCREW #8x1" Blk Pan Head

8

C01076

RCA JACK DUAL GOLD RED/WHT

1

C01256

JACK SPEAKER QUAD PC

2

CT, LINE 1

TE1175

TRMNL MALE TAB 0.32"x0.25" PI

3

LINE 2

ELECTRICAL PARTS LIST

Capacitors

C1, C2

CP1635

CAP ALUM EL 4700uF 20% 63v

2

C3, 20

CP1473

CAP CERAMIC 220 pF 50V P

2

C4, 24, 30

CP1415

CAP ALUM EL. 2.2uF 20% 50V P

6

31, 32, 33

C5

CP1439

SMD CAP 33nF 10% 100V X7R PI

1

C7

CP1633

CAP CERAMIC 0.033uF 5% 50 PI

1

C8, 10, 13

CP1552

SMD CAP 0.1uF 20% 100V Z5U P

3

C9, 12, 27, 29 CP1417

CAP ALUM EL. 22uF 20% 16V P

4

C11

CP1178

CAP POLY FILM 22nF 5% 63V P

1

REF. NO.

PART NO.

DESCRIPTION

QTY

C14, 16

CP1426

SMD CAP 0.1uF 20% 50V Z5U P

2

C15

CP1479

SMD CAP 3300pF 10% 100V X PI

1

C19, 28

CP1645

CAP AL EL 22uF 20% 63V 85 PI

2

C21

CP1478

SMD CAP 330pF 5% 100V NPO P

1

C22

CP1475

SMD CAP 33pF 5% 50V NPO 12 P

1

C23

CP1411

CAP ALUM EL. 100uF 20% 16V P

1

C1P

CP1426

SMD CAP 0.1uF 20% 50V Z5U P

1

C2P, C3P

CP1480

SMD CAP 470pF 5% 100V NPO

2

C4P

CP1552

SMD CAP 0.1uF 20% 100V Z5U P

1

C5P, 6, 17

CP1579

33

µ

F 16V NPE

3

CX

CP1808

0.1

µ

F 250V

1

CX1, CX2,

CP1844

0.01

µ

F 200V SMD

4

CX3, CX4

Diodes

CR1, 2, 3, 4

DI1005

1N5401 DIODE 3A/200V P

4

D1, 2, 3, 4, 5 DI1132

SMD DIODE 1N4148 LL-34 PKG T P 5

Z1, 2

DI1150

SMD ZENER 15V 5% CP PKG T P

2

Fuses

F1 (120V)

870-0052

FUSE Fast Blow 5A 250V 3AG

1

F1 (230V)

870-0017

FUSE Fast Blow 2A 250V 3AG

1

F2

FS1073

FAST BLOW 8A 250V ACG

1

(early versions)

F2

312004

FAST BLOW 4A 250V ACG

2

(later versions)

Integrated Circuits

IC1, 2, 3,

IC1041

IC SMD DUAL J-FET NJM072B

5

4, 5

OP AMP

Resistors

J1, 2, 3, 4, 5, RS1779

SMD RES ZERO

JUMPER 12 P

8

6, 7, 10

P1

RS1794

POT, 50K

20% LOG TAPER

1

R1, 2, 4, 5,

RS1702

SMD RES 100K

5% 1/8W 12 P

8

24, 42,

57, 58

R3, 8, 14, 18 RS1701

SMD RES 10K

5% 1/8W 120 P

15

21, 23, 27,

32, 38, 39,

45, 50, 52,

53, 54

R6, 7, 31, 48 RS1700

SMD RES 1K

5% 1/8W 12 P

4

R9, 10

RS1720

SMD RES 200K

1% 1/8W 1 PI

2

R11

RS1872

SMD RES 51K

5% 1/8W 120 P

1

R12

RS2101

SMD RES 24K

5% 1/8W 120 PI

1

R13, 15

RS1704

SMD RES 22K

5% 1/8W 120 P

2

R16, 49

RS1715

SMD RES 5.6K

5% 1/8W 1 P

2

R17

RS1883

SMD RES 1.5K

5% 1/8W 12 P

1

R19

RS1878

SMD RES 10

5% 1/8W 120 P

1

R20, 40

RS1829

SMD RES 160

5% 1/8W 12 P

2

R22, 33, 34

RS1705

SMD RES 4.7K

5% 1/8W 12 P

3

R25

RS1831

SMD RES 7.5K

5% 1/8W T/ P

1

BASS 20 PARTS LIST

Summary of Contents for JBL BASS20

Page 1: ...ERVICE MANUAL SERVICE MANUAL Powered Subwoofer JBL Consumer Products Inc 80 Crossways Park West Woodbury N Y 11797 1 800 336 4JBL in the USA A Harman International Company Part No 1112 JBLBASS20 BASS2...

Page 2: ...nputs Line Level and Speaker Level Outputs Full Range Speaker Crossover Frequency 120Hz Frequency Response 40Hz 120Hz 3dB External Dimensions Inches Height 17 3 4 Width 10 Depth 24 External Dimensions...

Page 3: ...methods and design refinements are introduced into existing models without notice as a routine expression of our design philosophy For this reason Bass Series loudspeakers may differ in some respect...

Page 4: ...TO position and turn LEVEL control full clockwise 9 Green LED should light immediate bass response should be heard and felt from port tube opening Sweep Function 1 Follow steps 1 4 above using a sweep...

Page 5: ...blies for easier access Circuit board does not have to be removed from heatsink 2 R36 See drawing cut trace connecting Q4 collector and main C1 pad 3 Create solderable surface on PCB on Q4 side of cut...

Page 6: ...5 Powered Subwoofer BASS20 BASS 20 120v US 230v European Versions BLOCK DIAGRAM...

Page 7: ...6 Powered Subwoofer BASS20 BASS20 120V 230V versions AMPLIFIER EXPLODED VIEW...

Page 8: ...7 Powered Subwoofer BASS20 BASS20 CABINET ASSEMBLY EXPLODED VIEW...

Page 9: ...P 3 C9 12 27 29 CP1417 CAP ALUM EL 22uF 20 16V P 4 C11 CP1178 CAP POLY FILM 22nF 5 63V P 1 REF NO PART NO DESCRIPTION QTY C14 16 CP1426 SMD CAP 0 1uF 20 50V Z5U P 2 C15 CP1479 SMD CAP 3300pF 10 100V X...

Page 10: ...96 1 Increment And Transistor Voltage To 140v 6 19 96 2 R11 changed from 27K to 51K R12 changed from 51K to 24K R9 changed from 20K to 200K R10 changed from 33K to 200K R29 changed from 11K to 33K R5...

Page 11: ...1 0 Powered Subwoofer BASS20 BASS20 PACKAGING VIEW MUSIC20 SCS120...

Page 12: ...1 1 Powered Subwoofer BASS20 PRINTED CIRCUIT BOARDS TOP VIEW...

Page 13: ...1 2 Powered Subwoofer BASS20 PRINTED CIRCUIT BOARDS BOTTOM VIEW...

Page 14: ...1 3 Powered Subwoofer BASS20 INTEGRATED CIRCUIT DIAGRAM...

Page 15: ...1 4 Powered Subwoofer BASS20 120V SCHEMATIC DIAGRAM...

Page 16: ...1 5 Powered Subwoofer BASS20 230V SCHEMATIC DIAGRAM...

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