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BU-120/HTS-20 rev. A ELECTRICAL PARTS LIST

Resistors

R1

40705

4.7M 1/4W 5% carbon film

1

R2

40426

24k 1/4W 5% carbon film

1

R3

40412

33.2k 1/4W 1% metal film

1

R4

40406

100k 1/4W 5% carbon film

1

R4a/b/c

40105

0.1 1/2W 5% 3pcs.

3

R5, 6

40420

1k 1/4W 5% carbon film

2

R7

40409

10k 1/4W 5% carbon film

1

R8

40406

100k 1/4W 5% carbon film

1

R9

40421

3.9k 5W 5%, 3W can be used

1

R14

40409

10k 1/4W 5% carbon film

1

R15

40406

100k 1/4W 5% carbon film

1

R16, 17

40101

820 2W 5% carbon film

2

R18

40407

220k 1/4W 5% carbon film (LED sens) 1

R19

40422

1k 1/2W 5% carbon film

1

R20

40405

4.7k 1/4W 5% carbon film

1

R21

40409

10k 1/4W 5% carbon film

1

R22

40410

2.2k 1/2W 5% carbon film

1

R24

40417

47k 1/4W 5% carbon film

1

R25

40406

100k 1/4W 5% carbon film

1

R26

40701

1.0M 1/4W 5% carbon film

1

R27

40428

8.2k 1/4W 1% metal film

1

R29

40103

470 1/4W 5% METAL FILM

1

Safety part

R30, 31

40429

16.4k 1/4W 1% metal film

2

R32

40415

470k 1/4W 5% carbon film

1

R33

40100

332 1/2W 5% carbon film

1

R35

40422

301k 1/4W 1% metal film

1

R36

40427

23.7k 1/4W 1% metal film

1

R37, 38

40417

47k 1/4W 5% carbon film

2

R39

40430

36.5k 1/4W 1% metal film

1

R40

40431

68k 1/4W 5% metal film

1

R42, 43

40406

100k 1/4W 5% carbon film

2

R44

40409

10k 1/4W 5% carbon film

1

R45

40409

10k 1/4W

1/4W

5% carbon film

1

R46

40111

47 ohms

5% carbon film

1

R48

40432

6.98k 1/4W 1% metal film

1

R49

40415

470k 1/4W 5% carbon film

1

R50

40100

332 1/4W 5% carbon film

1

R51

40417

47k 1/4W 5% carbon film

1

R52

40404

1k 2W 5% carbon film

1

R53, 54, 55, 56

40106

100 2W 5% carbon film

4

R57

40404

1k 2W 5% carbon film

1

R58

40435

8.06k 1/4W 1% metal film

1

R59

40405

4.7k 1/4W 5% carbon film

1

R60

40701

1.0M 1/4W 5% carbon film

1

R23

40438

20K

0.25W 1% metal film

1

Crossover

40425

50k 1/4W 10% Double Log Pot

1

Level

40402

5k 1/4W 10% Single Linear Pot

1

Capacitors

C1, 2

30706

4700uF 50V -4% Electrolytic Radial

2

Safety part

C3

30514

47nF 50V -4% Mono-ceramic axial

1

C4

30504

100nF 50V -4% Mono-cer rad

1

0.2"/ax 0.3"

C5

30504

100nF 50V -4% Mono-cer rad

1

0.2"/ax 0.3"

C6

30705

10uF 50V -4% Electrolytic Radial NP

1

Safety part (See Service Bulletin

INF2000-01 page 15)

C7

30510

33nF 50V 10% Mono-ceramic axial

1

C7a/b

30505

100nF 100V 20% Metal Polyester Rad

1

C8, 9

30504

100nF 50V +80/-20% Mono-ceramic axial 2

C11

30702

100uF 35V -4% Electrolytic Radial

1

C13

30507

10nF 50V 20% Mono-ceramic axial

1

C14

30511

330nF 50V 10% Mono-ceramic axial

1

C15, 16

30707

220uF 50V 20% Electrolytic Radial

2

C17

30502

100nF 50V -4% Mono-ceramic radial

1

C18, 19, 20

30504

100nF 50V 10% Mono-ceramic axial

3

C24

30502

100nF 50V -4% Mono-ceramic axial

1

C26

30512

22nF 50V 10% Mono-ceramic axial

1

C27

30513

3.3nF 50V 10% Mono-ceramic axial

1

C28

30507

10nF 50V 20% Mono-ceramic axial

1

C29

30703

4.7uF 50V -4% Electrolytic Radial

1

C31

30514

47nF 50V 10% Mono-ceramic axial

1

temp stable

Diodes

D1

50101

ZENER 1N5256B 30V 5% 0.5W

1

LED 1 or 2

50106

Dual Cir LED (2 legged)

2

D2, 4

50104

1N4148 100V 0.1A

4

D3

50102

ZENER 1N4749A 24V 5% 1W

1

D6

50103

ZENER 1N5234B 6.2V 5% 0.5W

1

D9, 10

50105

ZENER 1N4744A 15V 5% 1W

2

DBR

50100

Bridge Rect 200V 4A Safety part

Transistors

Q1

60151

MPS A13 30V NPN (Darl)

1

Q2

60152

2N3906 40V PNP, 2N4402 alternate

1

Q3

60153

2N3904 40V NPN, 2N4401 alternate

1

Q4, 5

60154

MPS A56 80V PNP

2

IntegratedCircuits

U1

60100

LM324 Quad OpAmp +/-15

1

U2

60101

TLO 82 Dual OpAmp +/-15

1

60301

S53AMI Power Amp module

1

SAFETY PART

Inductors

CMC1

80100

mc4438 Safety part

1

L1

80101

mc4436 Safety part

1

L2

80102

BL02RN2-R62 Ferrite Bead

1

2 4

Amplifier/Subwoofer

BU-120/HTS-20

REF#

PART#

DESCRIPTION

QTY

REF#

PART#

DESCRIPTION

QTY

Summary of Contents for HTS-20

Page 1: ...Infinity Systems Inc 250 Crossways Park Drive Woodbury N Y 11797 1 800 553 3332 A Harman International Company Rev G 6 2001 BU 120 HTS 20 Powered Subwoofer SERVICE MANUAL...

Page 2: ...re due to internal cabinet pressure and vibration C6 10uF 50V electrolytic radial BU120 and HTS 20 rev A only S53AMI or CN1 Power output module Use only factory replacement Faceplate Faceplate Use onl...

Page 3: ...5 TECH TIPS 16 BU 120 HTS 20 PACKING CABINET ASSEMBLY 17 BU 120 HTS 20 AMPLIFIER ASSEMBLY EXPLODED VIEW 18 BU 120 HTS 20 rev A PCB revision 3 52 Component Side Trace 20 BU 120 HTS 20 rev A PCB revisio...

Page 4: ...minal Freq 1 input driven Line Input 63 mVrms 2dB To Rated Power Vol Max 1 input driven AP source Z 600 ohms Speaker Hi Level Input 4 8 Vrms 2dB To Rated Power Vol Max 1 input driven AP source Z 25 oh...

Page 5: ...zero ohms source impedance Signal Present LED Yes Bi Color LED green signal red no signal Signal Present Input Freq 100 Hz functional Nominal 200uF Series Cap on PCB Signal Present Level 35 mV functi...

Page 6: ......

Page 7: ...of each stereo pair of leads to the preamplifier s left and right outputs and connect the other end to the corresponding left and right LOW LEVEL INPUTS 1 on the subwoofer If you are using a tube pre...

Page 8: ...air See Figure 3 Figure 3 Use this method when using a single subwoofer output or two subwoofers The subwoofer may be connected to your system using the HIGH LEVEL INPUTS 4 on the plate located on the...

Page 9: ...ting one subwoofer to satellites Depending on whether you are using one or two subwoofers connecting your satellites can be accomplished in one of two ways If you are using a single subwoofer with a p...

Page 10: ...trol depends on the low frequency capabilities of your satellite speakers Adjust this knob to the lowest frequency that you satellite speakers were designed to reproduce refer to Operation step 7 1 0...

Page 11: ...djustment for your system Room Placement 8 The room placement of the subwoofer is the most critical aspect of its installation It will be necessary for you to try various locations in your listening r...

Page 12: ...NOTE When testing the BU120 HTS 20 amplifier a load must always be connected to the output terminals whether the woofer or a 4 to 8 ohm resistive load...

Page 13: ...1 3 Amplifier Subwoofer BU 120 HTS 20 BU 120 HTS 20 POWER AMP MODULE TESTING FLOW CHART HTS 20 rev A only...

Page 14: ...should be able to remove the amplifier far enough out of the cabinet to service it without removing the woofer wires 4 Locate the Power Amp Module it is the large gray component with a metal case On...

Page 15: ...47 1 4W resistor R23 20k 1 2W resistor used only on models BU120 HTS 20 revA BU80 HTS 10 BU120 HTS 20 General reference for location only not all parts or designators may conform to these drawings FO...

Page 16: ...e all knobs nuts and Philips screws from the outer control section of the amplifier faceplate 5 Locate the sealed cover on the inside of the amplifier faceplate see illustration the bead of adherent m...

Page 17: ...12 WOOFER BU 120 HTS 10 rev A 200300 HTS 20 rev B 090 312000 000 CABINET NOT FOR SALE AMPLIFIER ASSEMBLY SCREWS 8 TOP STYROFOAM RAIL PADS 2 per carton 200360 PLASTIC BAG BOTTOM STYROFOAM RAIL PADS 2...

Page 18: ...er Subwoofer BU 120 HTS 20 BU 120 HTS 20 AMPLIFIER ASSEMBLY EXPLODED VIEW E E D D C C B B A A 7 7 6 6 5 5 4 4 3 3 2 2 1 1 BU 120 HTS 20 Amplifier Assembly Exploded View 6 20 18 6 1 19 20 18 19 20 6 HT...

Page 19: ...and HTS 20 rev A ONLY 12 083 041802 017 Power cord 2 conductor SAFETY PART 1 HTS 20 rev B ONLY 13 80106 Fuse PCB complete with connectors SAFETY PART 1 BU 120 and HTS 20 rev A ONLY 13 011 080203 000 F...

Page 20: ...2 0 Amplifier Subwoofer BU 120 HTS 20 Revision 3 52 Component Side Trace Layer 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G BU 120 HTS 20 rev A PCB Component Side Trace...

Page 21: ...2 1 Amplifier Subwoofer BU 120 HTS 20 Revision 3 52 Solder Side Trace Layer as viewed through the board 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G BU 120 HTS 20 rev A PCB Solder Side Trace...

Page 22: ...2 2 Amplifier Subwoofer BU 120 HTS 20 BU 120 HTS 20 rev A PCB Component Side Trace Revision 3 53 Component Side Trace Layer 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G...

Page 23: ...2 3 Amplifier Subwoofer BU 120 HTS 20 BU 120 HTS 20 rev A PCB Solder Side Trace FANCY 3 53 Solder Side Trace Layer as viewed through the board 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G...

Page 24: ...38 20K 0 25W 1 metal film 1 Crossover 40425 50k 1 4W 10 Double Log Pot 1 Level 40402 5k 1 4W 10 Single Linear Pot 1 Capacitors C1 2 30706 4700uF 50V 4 Electrolytic Radial 2 Safety part C3 30514 47nF 5...

Page 25: ...All AC powered test instruments meters oscilloscopes etc must have a floating ground i e be connected to an isolation transformer 3 Align and position the Amp Module before soldering 4 Attach the amp...

Page 26: ...2 6 Amplifier Subwoofer BU 120 HTS 20 BU 120 HTS 20 rev A SCHEMATIC 1 of 2 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G BU 120 HTS 20 Schematic 1 of 2...

Page 27: ...fier Subwoofer BU 120 HTS 20 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G BU 120 HTS 20 Schematic 2 of 2 See page 15 Service Bulletin INF2000 01 BU 120 HTS 20 rev A SCHEMATIC 2 of 2 Later revs valu...

Page 28: ...esistor 220K 1 4W J R122 1 020 270697 120 Carbon resistor 270K 1 4W J R116 1 020 300497 120 Carbon resistor 3K 1 4W J R16 1 020 330497 120 Carbon resistor 3K3 1 4W J R33 1 020 330597 120 Carbon resist...

Page 29: ...0697 120 Carbon resistor 100K 1 4W J Taping R2 1 020 100797 120 Carbon resistor 1M 1 4W J Taping R10 1 020 220397 121 Carbon resistor 220R 1 4W J Taping R6 1 020 330497 120 Carbon resistor 3K3 1 4W J...

Page 30: ...P N 052000W1G Red Wht JK102 1 072 040032 000 Terminal P 3 96 3P CON3 1 072 040039 000 Terminal PCB TYPE PC205 t 0 8mm T205MA J101 102 2 074 030002 000 Toggle sw P NL101 sw101 102 2 091 000143 000 EMI...

Page 31: ...31 HTS 20 REV B CIRCUIT BOARDS...

Page 32: ...32 HTS 20 REV B CIRCUIT BOARDS cont...

Page 33: ...C119 033u R122 220K R129 47K D121 1N4148 10K 1 4W R124 R126 1K5 1 4W 0033u C130 R130 22K 68K R5 10K R6 R2 820 5W R1 820 5W 4 7R R4 C6 1u 63V 4700u 50V C2 4700u 50V C1 D4 15 3 D3 15 3 C7 1u 6 2V 1N5234...

Page 34: ...3 2 IRF530 Q2 1 3 2 Q3 IRF530 10 R11 1 2 U2 A 74HC14 R12 10 13 12 74HC14 U3 F 1 2 U3 A 9 8 U3 D 6K8 R1 C10 100U 16V R1330K FB 820 R14 ZD2 15V ZD1 15V IN 15V S D 15V 6 5 7 LF353 U1 B C8 1000p 3 4 U2 B...

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