Harman Infinity BU-80 Service Manual Download

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Infinity Systems Inc.

250 Crossways Park Drive

Woodbury, N.Y. 11797

1-800-553-3332

A Harman International Company

Rev

/2000

BU-80/HTS-10

Powered Subwoofer

SERVICE MANUAL

Summary of Contents for Infinity BU-80

Page 1: ...Infinity Systems Inc 250 Crossways Park Drive Woodbury N Y 11797 1 800 553 3332 A Harman International Company Rev D 11 2000 BU 80 HTS 10 Powered Subwoofer SERVICE MANUAL...

Page 2: ...ly factory replacement Main PCB Use only factory replacement R29 470 25W METAL OXIDE non flammable Leakage Resistance Check Before returning the unit to the customer perform a leakage or resistance te...

Page 3: ...W Driver 8 Woofer Crossover Frequency 50Hz 150Hz continuously variable Dimensions H x W x D 11 29 2cm x 11 29 2cm x 11 29 2cm Add 1 4 5cm for feet Weight 26 lbs 11 8 kg Refinements may be made on occa...

Page 4: ...led w Line Spkr Input Select Switch Line Outputs L C R L R functional Buffered Output Pre Volume control Line Out Adj X over no Hz n a n a n a Spkr Hi Level In L C R mono L R functional Enabled w Line...

Page 5: ...ECTRIC SHOCK DO NOT OPEN 120VAC 60Hz 100W R R L L Power SPKR IN SPKR OUT Low Level In BU 80 HTS 10 or Digital Technology 1 2 3 5 4 CONTROLS AND THEIR FUNCTION 1 High Level input and Output terminals 2...

Page 6: ...d 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 pr...

Page 7: ...fer pair See Figure 3 Figure 3 Use this method when using single subwoofer or two subwoofers The subwoofer may be connected to your system using the HIGH LEVEL INPUTS 4 on the plate located on the rea...

Page 8: ...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 9: ...er has a variable frequency control that can be used to block unwanted frequencies between 50 150Hz from being reproduced by the subwoofer When you set this control depends on the low frequency capabi...

Page 10: ...the Volume control UP by about the same amount This will increase low bass while leaving the mid bass sounding the same as it did before the adjustment To reduce low bass without changing midbass turn...

Page 11: ...NOTE When testing the BU80 HTS 10 amplifier a load must always be connected to the output terminals whether the woofer or a 4 to 8 ohm resistive load...

Page 12: ...R ATTACHES THE PROBE TIP TO SPK and REFERENCE LEAD TO SPK Reading 100kHz 10 1Vpp B Pre Amp Section 1 Low Level Input Sensitivity Set up Turn level and Low Pass Pot Fully CW Generator set at 50mV 43Hz...

Page 13: ...C2 Use scope to check switching frequency from the load 100KHz 10 1Vpp Check input of module wrt GND 0V D C Power up with no signal input LED RED OK OK OK OK OK OK OK OK Check C12 and Pre AMP Use scop...

Page 14: ...outer perimeter of the amplifier faceplate 3 Remove amplifier assembly you should be able to remove the amplifier far enough out of the cabinet to service it without removing the woofer wires 4 Locat...

Page 15: ...output and capacitor C6 10uf 50v NPE is damaged in the amplifier replace with the following part Infinity part 30712 10uf 100v NPE BU80 HTS 10 BU120 HTS 20 General reference for location only not all...

Page 16: ...CAUTION All parts must be replaced at the same time do NOT attempt to just replace original fuse F1 0 5A with the new 1 0A rated fuse alone without replacing original power transformer 4300 This bulle...

Page 17: ...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 must be...

Page 18: ...1 8 Amplifier Subwoofer BU 80 HTS 10 BU 80 HTS 10 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 80 HTS 10 Amplifier Assembly Exploded View...

Page 19: ...1 0A T type slo blo fuse SAFETY PART 1 HTS 10 rev C ONLY 12 80105 Power cord 2 conductor SAFETY PART 1 BU 80 and HTS 10 rev A B ONLY 12 083 041802 017 Power cord 2 conductor SAFETY PART 1 HTS 10 rev C...

Page 20: ...00270 4percarton OWNER S MANUAL BU 80 200230 HTS 10 HTS10GUIDE PLASTIC BAG CARTON BU 80 200220 HTS 10 HTS10CTN BU 80 HTS 10 PACKING BU 80 HTS 10 CABINET ASSEMBLY AMPLIFIER ASSEMBLY FEET PAD 4 STICKERS...

Page 21: ...80 HTS 10 BU 80 HTS 10 rev A B PCB E E D D C C B B A A 7 7 6 6 5 5 4 4 3 3 2 2 1 1 PLAIN 5 Component Side Trace PLAIN 5 Solder Side Trace Layer as viewed through the board The PLAIN 5 PCB was used in...

Page 22: ...2 Amplifier Subwoofer BU 80 HTS 10 BU 80 HTS 10 rev A B PCB PLAIN 5 1 Component Side Trace PLAIN 5 1 Solder Side Trace Layer as viewed through the board E E D D C C B B A A 7 7 6 6 5 5 4 4 3 3 2 2 1...

Page 23: ...7k 1 4W 5 carbon film 1 R21 40409 10k 1 4W 5 carbon film 1 R22 40449 3 3k 1 2W 5 carbon film 1 R26 40701 1000k 1 4W 5 carbon film 1 R27 40411 24 9k 1 4W 1 metal film 1 R28 40409 10k 1 4W 5 carbon film...

Page 24: ...l 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 Mo...

Page 25: ...2 5 Amplifier Subwoofer BU 80 HTS 10 BU 80 HTS 10 rev A B 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 80 HTS 10 rev A B Schematic 1 of 2...

Page 26: ...2 6 Amplifier Subwoofer BU 80 HTS 10 5 5 4 4 3 3 2 2 1 1 A A B B C C D D E E F F G G See page 15 Service Bulletin INF2000 01 BU 80 HTS 10 rev A B SCHEMATIC 2 OF 2 BU 80 HTS 10 rev A B Schematic 2 of 2...

Page 27: ...rbon resistor 4R7 1 4W J R002 1 020 470497 120 Carbon resistor 4K7 1 4W J R117 1 020 470597 120 Carbon resistor 47K 1 4W J R123 1 020 470697 120 Carbon resistor 470K 1 4W J R129 1 020 680597 120 Carbo...

Page 28: ...resistor 220R 1 4W J R6 1 020 330497 120 Carbon resistor 3K3 1 4W J R8 1 020 680497 120 Carbon resistor 6K8 1 4W J R1 1 032 100394 302 MND mylar capacitor 0u1 100V K P 7 5 C9 1 034 100525 303 elec cap...

Page 29: ...x165mm 1 062 050800 000 PUSH TERMINAL 8P JK101 1 070 560891 108 SCREW BTS 3 2 6x8m m 072 010058 000 RCA JACK 2P P N 052000W1G Red Wht JK102 1 072 040032 000 Terminal P 3 96 3P CN001 1 072 040039 000 T...

Page 30: ...30 HTS 10 REV C Power Amp Module PCB...

Page 31: ...31 HTS 10 REV C CIRCUIT BOARD cont...

Page 32: ...32 HTS 10 REV C CIRCUIT BOARD cont...

Page 33: ...02 D101 1N4148 3 2 1 100KB VR102 2n2 C109 13 12 14 TL074 IC101 D 15V 1u C114 4 IN 3 GND 2 15V 5 S D 6 15V 7 V 8 V 9 V 10 O P 11 V 12 V 14 6V 13 V 1 FB 15 LIMIT PWR MODULE CON101 BU120MODEL 15P A 15V 1...

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