Infinity BU-80, BU-80-E, HTS-10 Service manual

BU80

BU80E

HTS-10

POWERED SUBWOOFER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev H 11/2001

Amplifier/Subwoofer BU-80/BU80E/HTS-10

SAFETY INFORMATION/VERSION DIFFERENCES

Warning

Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock. Therefore, any service procedures are to be performed by qualified service personal ONLY!

Caution

This unit does not have a power switch. Hazardous voltages are present within the unit whenever it is plugged in.

Before the amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is plugged in. Do not exceed rated voltage by more than 10%: operation below 90% of rated voltage will cause poor performance or may shut the unit off.

List of Safety Components Requiring Exact Replacements

F1 ** Fuse SLO BLO 0.50A or 1.0A 250V

5 x 20mm.UL approved

See Bulletin (INF2000-02) page 16.

PWRCORD SPT-2 or better with polarized plug, UL

approved wired with the hot side to fused side. Use with factory replacement panel strain relief only.

T1 ** Transformer. Use only factory

Replacement.

DBR or D001 Bridge diode. Use only factory

replacement.

C1, 2 3300uF, 50V electrolytic filter caps. Be

sure replacement part is at least the same working voltage and capacitance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration.

C6 * 10uF 50V electrolytic radial (BU80 and

HTS-10 version “A”,”B” only) S53AMI Power output module. Use only factory or CON101 replacement Faceplate Use only factory replacement Air leak cover Use only factory replacement CMC1 Use only factory replacement L1 Use only factory replacement Fuse PCB Use only factory replacement Main PCB Use only factory replacement R29 470 ohm 1/4W METAL OXIDE, non

flammable

Leakage/Resistance Check

Before returning the unit to the customer, perform a leakage or resistance test as follows: Leakage Current. Note there is no power switch on this unit. When the power plug is plugged in, the unit is live. Connect the unit to its rated power source. Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test. if leakage current exceeds 0.5mA, the unit is defective. Reverse the polarity of the AC supply and repeat. Resistance. Measure the resistance from either side of the line cord to chassis ground. If it is less than 500k ohms, the unit is defective.

WARNING! DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected.

* See Service Bulletin (INF2000-01) page 15. ** See Service Bulletin (INF2000-02) page 16.

Rev A version of the BU-80/HTS-10 subwoofer uses the following SAFETY PARTS: #80103 - T1 Power Transformer #4300 #80104 - F1 Line fuse 0.5A 250V T type slo-blo Rev B version of the BU-80/HTS-10 subwoofer uses the following SAFETY PARTS: #80127 - T1 Power Transformer #4300F #80111 - F1 Line fuse 1.0A 250V T type slo-blo Either Rev A or Rev B can be identified by: The correct fuse rating will be printed on the amplifier label, also:

BU-80: Rev A version

serial #AM0011-29474 and below; Rev B version serial #AM0011-29475 and above. HTS-10: Rev A version serial #AM0011-07400 and below; Rev B version serial #AM0011-07401 and above.

HTS-10 subwoofer only

There is a third version, “C”, with minor internal differences.

Data for this ver s ion is inc luded, and differences ar e noted in the manual. Units can be identif ied for service as follows: Amplifier fac eplate says “Made in Canada” on the “B ” version. Amplifier fac eplate says “Made in China” on the “C” version.

BU80E = HTS-10 version, “C”

TABLE OF CONTENTS

Amplifier/Subwoofer

BU-80/BU80E/HTS-10

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.