Harman Infinity BU-80 Service Manual
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Harman Infinity BU-80 Service Manual

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

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Summary of Contents for Harman Infinity BU-80

  • Page 1: Bu-80/Hts-10 Rev. A,B Pcb (Version 5.1)

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

  • Page 2: Safety Information

    BU-80/HTS-10 Amplifier/Subwoofer SAFETY INFORMATION Warning Leakage/Resistance Check Any person performing service of this unit will be exposed to Before returning the unit to the customer, perform a leakage hazardous voltages and the risk of electric shock. It is or resistance test as follows: assumed that any person who removes the amplifier from this Leakage Current.

  • Page 3: Table Of Contents

    BU-80/HTS-10 Amplifier/Subwoofer TABLE OF CONTENTS SAFETY INFORMATION ..........2 TECH TIPS ..............17 DETAILED SPECIFICATIONS .........3 BU-80/HTS-10 AMPLIFIER ASSEMBLY EXPLODED VIEW ............18 GENERAL SPECIFICATIONS..........3 BU-80/HTS-10 PACKING & CABINET PARTS .....19 CONTROLS AND THEIR FUNCTION ......5 BU-80/HTS-10 rev. A,B PCB (version 5) ....... 20 BU-80/HTS-10 CONNECTIONS........6 BU-80/HTS-10 rev.
  • Page 4 BU-80/HTS-10 Amplifier/Subwoofer Signal to Noise SNR-A-Weighted Relative to rated output A-Weighting filter SNR-unweighted Relative to rated output 22k filter SNR rel. 1W-unweighted relative to 1W Output 22k filter Residual Noise Floor mVrms Volume @max, using 22k filter required due to 100kHz switching RMS reading on A/P noise present at speaker output Input Impedance...

  • Page 5: Controls And Their Function

    BU-80/HTS-10 Amplifier/Subwoofer CONTROLS AND THEIR FUNCTION Crossover Low-Level In Volume Frequency SPKR Power SPKR Digital Technology BU-80 HTS-10 “or” 120VAC 60Hz 100W CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE THE RISK OF ELECTRIC SHOCK. DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE High-Level input and Output terminals Low-Level Input Jacks: connect to preamplifier outputs Crossover Frequency: controls upper-corner roll-off points.

  • Page 6: Bu-80/Hts-10 Connections

    BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 CONNECTIONS When connecting your subwoofer make sure you turn all the power off. There are several ways to connect your subwoofer. Read this section carefully to determine which method is best suited for your installation. The subwoofer may be fed directly with a low-level signal taken from a preamplifier's output by using the second set of output jacks on the rear of the preamplifier (See Figure 1).
  • Page 7 BU-80/HTS-10 Amplifier/Subwoofer When using a single subwoofer, you MUST use a pair of stereo low-level leads from your preamplifier's outputs. When using two subwoofers, one for the left and another for the right channels, connect the left preamplifier output to BOTH the left and right LOW-LEVEL INPUTS of the subwoofer used for the left channel by using a Female-to-Male “Y”...
  • Page 8 BU-80/HTS-10 Amplifier/Subwoofer Figure 5. - Use this method when using two subwoofers. Figure 6. - Use this method when connecting 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 pair of satellites, connect them as shown in Figure 6.
  • Page 9 BU-80/HTS-10 Amplifier/Subwoofer Figure 7. - Use this method when c o n n e c t i n g t w o s u b w o o f e r s t o satellites. If you are using two subwoofers as a stereo pair with a pair of satellites, connect them as shown in Figure 7.

  • Page 10: Operation

    BU-80/HTS-10 Amplifier/Subwoofer OPERATION Setting the Controls Room Placement 1. Initially set the subwoofer's Volume control to the minimum 8. The room placement of the subwoofer is the most critical position. aspect of its installation. It will be necessary for you to try various locations in your listening room before you choose 2.

  • Page 11: Bu-80/Hts-10 Test Set Up And Procedure

    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: Bu-80/Hts-10 Power Amp Test Procedure Flow Chart

    BU80/HTS-10 rev. "A,B" A. Power Amp Section 1. Resistance Check Resistance from O/P of the module to GND should be >30K (NO LOAD) Resistance from V+ of the module to V- of the module should read >5k Resistance from V+ of the module to O/P of the module should read >30K Resistance from V- of the module to O/P of the module should read >30K 2.
  • Page 13 BU80/HTS-10 rev. "A,B" CAUTION : MODULE OUTPUT IS FLOATING AND IS NOT PROTECTED AGAINST A SHORT TO GROUND. ALL TEST INSTRUMENTS CONNECTED TO THE OUTPUT MUST BE FLOATING. ATTACH THE SCOPE PROBE TIP TO SPK - and REFERENCE LEAD TO SPK+. START Resistance check (no load)

  • Page 14: Service Bulletin Inf9902 - April 1999

    BU-80/HTS-10 Amplifier/Subwoofer SERVICE BULLETIN INF9902 - APRIL 1999 This is considered a Minor repair To: All Infinity Service Centers Models: BU-80/HTS-10 (rev. "A,B") Subject: Check Solder Joints in Event of Failure Some performance related complaints in the BU-80 powered Subwoofers may be caused by cold solder connections between the 28 pins of the Power Amp Module and the main circuit board.

  • Page 15: Service Bulletin Inf2000-01 - January 2000

    Service Bulletin Service Bulletin INF2000-01 Rev1 - November 2000 Warranty labor rate: MINOR repair All Infinity Service Centers Models: BU80, BU120, HTS-10, HTS-20 subwoofers Subject: Failure of C6 In the event you receive a BU80, BU120, HTS-10 or HTS-20 subwoofer with the complaint “no 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...

  • Page 16: Service Bulletin Inf2000-02 - March 2000

    BU-80/HTS-10 Amplifier/Subwoofer SERVICE BULLETIN INF2000-02 - MARCH 2000 Warranty labor rate: MINOR repair To: All Infinity Service Centers Model: BU-80/HTS-10 (rev. "A,B") Subject: Blowing fuses Early versions of the BU80 subwoofer, if driven near maximum output for an extended period of time, may repeatedly blow the internal line fuse.

  • Page 17: Tech Tips

    BU-80/HTS-10 Amplifier/Subwoofer TECH TIPS Troubleshooting tips and solutions to common service problems For models: BU80/HTS-10 TIP# INFTT2000-01 Complaint: How do you replace or service any of the front panel components on the Subwoofer faceplate for model BU80/HTS-10. Probable Cause: The High level Input terminals, potentiometers and RCA jack are behind a sealed cover to protect the air-tight integrity of the cabinet enclosure.

  • Page 18: Bu-80/Hts-10 Amplifier Assembly Exploded View

    BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 AMPLIFIER ASSEMBLY EXPLODED VIEW BU-80/HTS-10 Amplifier Assembly Exploded View...
  • Page 19 Ref# Part# Description 70170 #4x0.5" screws to secure input jacks 70171 #10 x 1" machine screw bolts for 4transformer 4 per unit 70172 #10 keps nuts for transformer 70173 #6 x 0.5" screws for fuse PCB 70301 Hum Shield Metal bracket mounted on transformer BU-80 and HTS-10 rev "A,B"...

  • Page 20: Bu-80/Hts-10 Packing & Cabinet Parts

    BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 PACKING & CABINET PARTS FEET (SET OF 4) BU-80/HTS-10 BU-80/HTS-10 CABINET ASSEMBLY (rev. "A,B") 200210 HTS-10 (rev. "C") 061-403005-000 SCREWS (4) SCREWS (4) 8" WOOFER BU-80/HTS-10 (rev. "A,B") 200200 HTS-10 (rev. "C") 090-308000-000 CABINET NOT FOR SALE BOTTOM STYROFOAM RAIL PADS AMPLIFIER...
  • Page 21 BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 (rev. A,B) PCB The PLAIN 5 PCB was used in early 120V versions only PLAIN 5 - Component Side Trace PLAIN 5 - Solder Side Trace Layer as viewed through the board...

  • Page 22: Bu-80/Hts-10 Electrical Parts List

    BU-80/HTS-10 Amplifier/Subwoofer 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...

  • Page 23: Bu-80/Hts-10 Integrated Circuit/ Transistors Diagrams

    BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 (re A,B ELECTRICAL PARTS LIST REF# PART# DESCRIPTION REF# PART# DESCRIPTION 40416 221k 1/4W 1% metal film Capacitors 40406 100k 1/4W 5% carbon film C1, 2 30701 3300uF 50V ±20% Electrolytic Radial SAFETY PART 40417 47k 1/4W 5% carbon film 30504 100nF 50V...

  • Page 24: Bu-80/Hts-10 Schematic 1 Of 2

    S53AM/S64AMI - Power Amp module SAFETY PART BU-80 and HTS-10 rev “A,B” ONLY +6V 15 NOTE: THE FOLLOWING PROCEDURES MUST BE FOLLOWED WHEN INSTALLING NEW AMP MODULES: FAILURE TO FOLLOW ONE OR MORE OF THESE STEPS MAY RESULT IN THE INSTANT DESTRUCTION OF THE MODULE WHEN POWERED UP.
  • Page 25 BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 (rev. A,B) SCHEMATIC 1 OF 2...
  • Page 26 BU-80/HTS-10 Amplifier/Subwoofer BU-80/HTS-10 (rev. A,B) SCHEMATIC 2 OF 2...

  • Page 27: Hts-10 Rev C Electrical Parts List

    HTS-10 REV C ELECTRICAL PARTS LIST Part Number Description Ref Designator MAIN PCB Semiconductors 050-002400-100 ZENER DIODE 24V D103 050-003000-100 ZENER DIODE 30V D104 050-006200-100 ZENER DIODE 6.2V D002 050-414802-100 1N4148 DIODE D101,102,105,106 050-524500-200 ZENER DIODE 15V/1W D003,004 051-001300-100 TRANSISTOR KSP113 Q102 051-101501-000 TRANSISTOR 2SA1015...
  • Page 28 HTS-10 REV C ELECTRICAL PARTS LIST (cont.) Part Number Description Ref Designator 032-100364-300 mylar capacitor 0u1/100V K R C001,002,003,007,008, 104105106107108, 118 032-180364-300 mylar capacitor 0u18/100V J P:5 C116 032-220163-300 mylar capacitor 0u0022/100V J P:5 C109,111 033-220543-200 elec capacitor 22uF/50V J6R 1020 C117 033-220644-281 NPE capacitor 220uF/50V K10R1326 VIE...
  • Page 29 HTS-10 REV C ELECTRICAL PARTS LIST (cont.) Part Number Description Ref Designator 008-061007-200 GASKET MODULE BLK CR C4305 1x7x80mm 008-061610-201 GASKET PCB PU FOAM SM-55 3x6x200mm 015-161000-102 MAIN PCB;FR-4 REV:F PCB;127x165mm 062-050800-000 PUSH TERMINAL 8P JK101 070-560891-108 SCREW BTS-3 2.6x8m/m 072-010058-000 RCA JACK 2P P/N:052000W1G (Red,Wht) JK102...
  • Page 30 HTS-10 REV C Power Amp Module PCB...

  • Page 31: Hts-10 Rev C Circuit Boards

    HTS-10 REV C CIRCUIT BOARD (cont.)
  • Page 32 HTS-10 REV C CIRCUIT BOARD (cont.)

  • Page 33: Hts-10 Rev C Schematic

    HTS-10 REV C SCHEMATIC...

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