Infinity Alpha 1200s Service Manual
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Infinity Alpha 1200s Service Manual

Infinity alpha 1200s powered subwoofer
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Alpha 1200s
Powered Subwoofer
SERVICE MANUAL
Infinity Systems Incorporated
250 Crossways Park Dr.
3/2006
Woodbury, New York 11797
Rev2

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  • Page 1 Alpha 1200s Powered Subwoofer SERVICE MANUAL Infinity Systems Incorporated 250 Crossways Park Dr. 3/2006 Woodbury, New York 11797 Rev2...

  • Page 2: Table Of Contents

    Bass Optimization Test & Measurement Kit Infinity Part Number: 335852-002 Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and construction details in this and related Infinity publications are therefore subject to change without notice.

  • Page 3: Detailed Specifications

    Alpha 1200s Alpha 1200s Powered Sub/ Plate Amp LINE VOLTAGE Yes/No Hi/Lo Line Nom. Unit Notes US 120vac/60Hz 108-132 Vrms Normal Operation EU 230vac/50-60Hz 207-264 Vrms Normal operation, MOMS required QA Test Parameter Specification Unit Conditions Notes Limits Amp Section...
  • Page 4 Alpha 1200s QA Test Parameter Specification Unit Conditions Notes Limits Amp connected and AC on, then ATO Turn-on time seconds functional input signal applied (T) Time before muting, after input Auto Mute/ Turn-OFF Time minutes Auto turn of time (T) must be 10 > T < 17 Minutes...

  • Page 5: Controls

    Alpha 1200s ONTROLS Rear Panel B A S S O P T I M I Z A T I O N S Y S T E M -14.1 49.5 FREQUENCY LEVEL WIDTH LP ON PHASE GREEN: ON RED: STANDBY LP OFF...

  • Page 6: Connections

    Alpha 1200s If your receiver/processor has subwoofer ONNECTIONS outputs for the left and right channels: If your receiver/amplifier does not have subwoofer RECEIVER/PROCESSOR outputs for the left and right channels or an LFE output: RECEIVER/AMPLIFIER Front Speaker Output B A S S O P T I M I Z A T I O N S Y S T E M -14.1...

  • Page 7: Operation

    Alpha 1200s PERATION Crossover Adjustments Power On Plug your subwoofer’s AC cord into a wall outlet. Do not use the The Crossover Adjustment Control determines the highest frequency at which the subwoofer reproduces sounds. If your main outlets on the back of the receiver.

  • Page 8: Bass Optimization System

    • Make sure the loudness contour (if any) on your receiver/ processor/preamp is turned off. Infinity has developed an optional test and measurement kit that allows the user to perform a series of measurements and aids • Set the receiver’s/processor’s tone controls (Bass and Treble) to their center or flat positions.

  • Page 9: Block Diagram

    Alpha 1200s...

  • Page 10: Bulletin Inf2004-01

    Subject: Distortion When Coming Out Of Standby In the event you receive an Alpha 1200s subwoofer with the complaint “There is a brief chirping sound, or short oscillation that occurs when the unit is in the AUTO mode, in Standby, when it’s triggered ON with a music signal”, follow the procedure below to correct this condition:...

  • Page 11: Exploded View

    Alpha 1200s EXPLODED VIEW Alpha 1200s Amplifier - Not For Sale Alpha 1200s Cabinet - Not For Sale (12) ITEM ITEM DESCRIPTION QTY. PART NO. DESCRIPTION QTY. PART NO. 1. Woofer, 12, " C.M.M.D. ™ , Shielded, 336056-001 7. Screw Torx HD, 3.9 x 30mm 9412730 3.4 ohms ±10%...

  • Page 12: Pcb Drawings

    Alpha 1200s...
  • Page 13 Alpha 1200s...
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  • Page 16 Alpha 1200s NOTE: DESIGNATORS ARE WRONG (SWAPPED) FOR L8 AND L11. BOTH DRAWING AND ACTUAL PCB ON MODEL FIFTEEN...

  • Page 17: Electrical Parts List

    Alpha 1200s Alpha 1200s Electrical Parts List Part Number Description Reference Designator AMP ASS'Y Resistors 021-100401-020 MOF Resistor 1K 1W J FK TYPE R173 021-560305-020 MOF Resistor 560R 5WS J 8x25 KINK 022-005105-020 Cement Resistor PN:SQM 0R05 5W J 25x13...
  • Page 18 Alpha 1200s Part Number Description Reference Designator 054-033904-100 SMD Transistor PN:MMBT3904LT1 SOT23 (ON Q25,28,29 054-033906-100 SMD Transistor PN:MMBT3906LT1 SOT23 (ON Q26,27,30 054-050601-100 SMD ZENER DIODE PN:BZX84C5V6 5.6V SOT-23 C36 D30 054-414803-100 SMD DIODE PN:LL4148 (Wishay) D4-6,13,14,21,22,31,33,38 054-540100-100 SMD Transistor PN:MMBT5401 LT1 SOT-23...
  • Page 19 Alpha 1200s Part Number Description Reference Designator Capacitors 031-100244-101 SMD Capacitor 0u01/50V K 1206 X7R C12,13,224 031-100344-102L SMD Capacitor 0u1/50V K 1206 X7R C227,229,230,232-235 031-100344-104 SMD Capacitor 100pF/50V K NPO 1206 C204,222 031-220244-103L SMD Capacitor 0u022/50V K 1206 X7R C202...
  • Page 20 Alpha 1200s Part Number Description Reference Designator 021-549398-100 MF Resistor 549R 1/8W F R344 021-590498-100 MF Resistor 5K9 1/8W F R382 021-619498-100 MF Resistor 6K19 1/8W F R359,374 021-680398-100 MF Resistor 680R 1/8W F R360 021-698598-100 MF Resistor 69K8 1/8W F...
  • Page 21 Alpha 1200s Part Number Description Reference Designator 024-560598-120 SMD Resistor 56K 1/8W J 0805 024-680498-120 SMD Resistor 6.8K 1/8W J 0805 R135,166 Capacitors 031-100244-100 SMD Ceramic Cap. 0u01/50V K 0805 X7R C108,118,131,140 031-100343-100 SMD Capacitor 100pF/50V J 0805 NPO C81,84...

  • Page 22: Integrated Circuit/Transistor Diagrams

    Alpha 1200s...

  • Page 23: Schematics

    Alpha 1200s HARMAN NEW Design 350089-001 CHANGE:R119,R224,R254 ALPHA-SUB-1200 CHANGE:R76,R244,R249,R254,C221 DEL:D218,R264 ALPHA-SUB-1200-P1F CHANGE:C224 ALPHA-SUB-1200 CHANGE:R78,R119 2002/09/16 CHANGE:R32,R33,R249,C323,C328 ADD:D218,R264 1 of 4 BELLE...
  • Page 24 Alpha 1200s HARMAN NEW Design 350089-001 CHANGE:R119,R224,R254 ALPHA-SUB-1200 CHANGE:R76,R244,R249,R254,C221 DEL:D218,R264 ALPHA-SUB-1200-P1F CHANGE:C224 ALPHA-SUB-1200 CHANGE:R78,R119 2002/09/16 CHANGE:R32,R33,R249,C323,C328 ADD:D218,R264 2 of 4 BELLE...
  • Page 25 Alpha 1200s HARMAN NEW Design 350089-001 CHANGE:R119,R224,R254 ALPHA-SUB-1200 CHANGE:R76,R244,R249,R254,C221 DEL:D218,R264 ALPHA-SUB-1200-P1F CHANGE:C224 ALPHA-SUB-1200 CHANGE:R78,R119 2002/09/16 CHANGE:R32,R33,R249,C323,C328 ADD:D218,R264 3 of 4 BELLE...
  • Page 26 Alpha 1200s HARMAN NEW Design 350089-001 CHANGE:R119,R224,R254 ALPHA-SUB-1200 CHANGE:R76,R244,R249,R254,C221 DEL:D218,R264 ALPHA-SUB-1200-P1F ALPHA-SUB-1200 CHANGE:C224 2002/09/16 CHANGE:R78,R119 CHANGE:R32,R33,R249,C323,C328 ADD:D218,R264 4 of 4 BELLE...

  • Page 27: Package

    Alpha 1200s PACKAGING 11 12 Legend on Page 9 Item Description Part number Qty. Spike Foot Kit 338076-001 Outer Carton 350613-001 Top and Bottom End Pads 350615-001 Owner’s Manual 350614-001 Warranty Card 335841-002...

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