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

Name: Infinity BU-80
Brand: Infinity
SKU: 2318271
Rating: 4 (1 reviews)

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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 W 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 version is included, and differences are noted in the manual.

Units can be identified for service as follows:

Amplifier faceplate says “Made in Canada” on the “B” version.

Amplifier faceplate says “Made in China” on the “C” version.

BU80E = HTS-10 version, “C”

Amplifier/Subwoofer

TABLE OF CONTENTS

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.