Infinity HTS-20 Service Manual Download | Manualshive

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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.

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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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