TABLE OF CONTENTS
Amplifier/Subwoofer
BU-80/BU80E/HTS-10
3
SAFETY INFORMATION/VERSION DIFFERENCES....2
GENERAL SPECIFICATIONS........................................3
DETAILED SPECIFICATIONS........................................4
CONTROLS AND THEIR FUNCTION............................5
BU80/BU80E/HTS-10 CONNECTIONS ........................6
OPERATION ................................................................10
BU80/BU80E/HTS-10 TEST SET UP PROCEDURE...11
BU-80/HTS-10 POWER AMP TEST PROCEDURE
FLOW CHART..............................................................13
SERVICE BULLETIN INF9902 - APRIL 1999 ..............14
SERVICE BULLETIN INF2000-01rev2 -
FEBRUARY 2001 ........................................................15
SERVICE BULLETIN INF2000-02 - MARCH ..............16
TECH TIPS ..................................................................17
BU80/BU80E/HTS-10 AMPLIFIER ASSEMBLY
EXPLODED VIEW........................................................18
BU80/BU80E/HTS-10 PACKING & CABINET PARTS...20
BU-80/HTS-10 rev. A, B PCB (version 5) ....................21
BU-80/HTS-10 rev A, B PCB (version 5.1) ..................22
BU-80/HTS-10 rev A, B ELECTRICAL PARTS LIST....23
BU80/BU80E/HTS-10 INTEGRATED CIRCUIT/
TRANSISTORS DIAGRAM ..........................................24
BU-80/HTS-10 rev A, B SCHEMATIC 1 of 2................25
BU-80/HTS-10 rev A, B SCHEMATIC 2 of 2................26
BU80E/HTS-10 REV C
ELECTRICAL PARTS LIST ...27
BU80E/HTS-10 REV C CIRCUIT BOARDS ...............29
BU80E/HTS-10 REV C SCHEMATIC .........................32
BU80E/HTS-10 REV C POWER AMP
MODULE SCHEMATIC ................................................33
GENERAL SPECIFICATIONS
Frequency Response (± 3 db)..............45Hz - 150Hz
Output (RMS) ......................................75W
Driver....................................................8” Woofer
Crossover Frequency ..........................50Hz ~ 150Hz (continuously variable)
Dimensions (H x W x D) ......................11½” (29.2cm) x 11½” (29.2cm) x 11½” (29.2cm)
Add 1¾” (4.5cm) for feet.
Weight ..................................................26 lbs/11.8 kg,
Refinements may be made on occasion to existing products without notice,
but will always meet of exceed original specifications unless otherwise stated.
IMPORTANT SERVICE NOTES: When testing the BU Series amplifier, a load must always
be connected to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load.
All AC powered test instruments (meters, oscilloscopes, etc.) must have a floating
ground, i.e. be connected to an isolation transformer.
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