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Summary of Contents for Infinity ENTRA SUB TWO
- Page 1 ENTRA SUB TWO POWERED SUBWOOFER SERVICE MANUAL Infinity Systems, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev 1 4/2003...
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Page 2: Table Of Contents
TABLE OF CONTENTS SPECIFICATIONS ..... . ……....2 DETAILED SPECIFICATIONS . - Page 3 17" x 15-3/8" x 19-3/8" (432mm x 391mm x 492mm) Weight: 47 lb (21.4kg) 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.
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Page 4: Specifications
Entra Sub Two INFINITY ENTRA SUB TWO 150W 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 Limits... - Page 5 Entra Sub Two QA Test Parameter Specification Unit Limits Conditions Notes Efficiency Efficiency Nominal Line voltage 120 VAC Maximum allowable input power under nominal Input voltage and frequency, HOT or COLD Stand-by Input Power Watts @ nom. line voltage operation.
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Page 6: Controls And Connections
Entra Sub Two ONTROLS AND ONNECTIONS Rear Panel ª ¡ Subwoofer-Level Control Green: On Line/LFE Selector Red: Stand-By ™ NORMAL Phase Switch £ 0º 180º Crossover Frequency Control 80Hz Line-Level/LFE Input ¢ High Speaker-Level Inputs 50Hz 150Hz High Speaker-Level Outputs Power Switch ∞... - Page 7 Entra Sub Two YSTEM ONNECTIONS If your receiver/processor does not have If you have a Dolby* Digital or DTS ® receiver/processor subwoofer outputs for the left and right with a low-frequency-effect (LFE) or subwoofer output: channels or an LFE output:...
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Page 8: Operation
Entra Sub Two PERATION Crossover Adjustments Power On Low-Pass-Frequency Adjustment control – The Low-Pass Plug your subwoofer’s AC cord into a wall outlet. Do not use the control determines the highest frequency at which the subwoofer outlets on the back of the receiver. -
Page 9: Mechanical/Packaging Parts List
Entra Sub Two Entra Sub Two Mechanical/Packaging Parts List MECHANICAL PARTS LIST AMPLIFIER Not For Sale WOOFER, 12” (305mm) C.M.M.D. SHIELDED 336056-001 DCR = 3.4 ohms ±10% GRILLE CUP (6) 333249-001 GRILLE 339615-001 FRONT BAFFLE 339616-001 FOOT (4) 330163-001 PORT TUBE 336805-001 SCREW, #6 x .75, BLK, PB PPH (16) AMPLIFIER, BAFFLE... -
Page 10: Exploded View/Service Access
HIGH LEVEL TO REMOVE REAR COVER AND ACCESS AMPLIFIER + – TO SERVICE THE ENTRA SUB TWO HIGH LEVEL 1) Remove the grille. 2) Extract (6) rubber grille retainers as shown in the illustration above; this can be accomplished by carefully pulling them out of... -
Page 11: Test Procedures
Entra Sub Two ENTRA SUB II TESTING PROCEDURE A. Power Amp Section Resistance Resistance from S+ (SPK O/P) to GND should be >1M W (NO LOAD) Check Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k W Resistance from V+ (C6 P+) to S+ (SPK O/P) should read >1MW... - Page 12 Entra Sub Two - Voltage measurements OP AMP SPEAKER U2(1) U2(14) U2(8) U3(7) U3(1) U3(14) U3(8) U5(7) U5(1) 306.9mV 461mV 460mV 658mV 628mV 598mV 2.326V 2.02V 3.57V 23.33V 2. High Level Input Sensitivity -Set up Turn level, X’OVER FREQ POT Fully CW and LFE switch off Set Generator at 1.3V@50Hz...
- Page 13 Entra Sub Two ENTRA SUB II POWER MODULE TESTING FLOW CHART CAUTION : SPEAKER 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 S - and REFERENCE LEAD TO S+.
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Page 14: Tech Tip Inftt2003-02
In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use ONLY the Infinity part# FE106401110 or only the brands: International Rectifier, or Fairchild. Replace both Q18 and Q22 MOSFET’s in the circuit, even if only one seems to be damaged. -
Page 15: Pcb Drawings
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Page 21: Block Diagram
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Page 22: Electrical Parts List
Entra Sub Two ENTRA II SUB Electrical Parts List Part Number Description Q'ty Reference Designator Resistors 020-220497-120 Film Resistor 2K2 1/4W J TAPING 021-100401-120 MOF Resistor 1K 1W J KINK MO-100 R103 021-220202-120 22R 2W(S) J MB TYPE 15x8 021-240405-020... - Page 23 Entra Sub Two Part Number Description Q'ty Reference Designator 026-500495-252 VR 5KA PN:RK163111R52B-5KA (EJ) Capacitors 031-100244-100 Ceramic 0u01/50V K 0805 X7R TAPING C33,45,51,66,67,5,10 031-100343-100 SMD Capacitor 100pF/50V J 0805 NPO TAPING C16,36,58 031-100344-100 SMD Capacitor 0u1/50V K 0805 X7R TAPING...
- Page 24 Entra Sub Two Part Number Description Q'ty Reference Designator Miscellaneous 025-010300-000 Thermo Switch TSE-103 K L:50mm 041-115001-000 BEAD COIL YT-10911 042-010053-003 X'fmr YT-10616-4 043-300101-000 INDUCTOR 30uH YT-10033 043-324300-000 INDUCTOR 324uH YT-10778 043-560200-000 INDUCTOR 56uH YT-10779 043-700101-000 TOROIDAL INDUCTOR 70uH YT-10682...
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Page 25: Integrated Circuit Diagrams
Entra Sub Two Integrated Circuit Diagrams 2N2907A, 2N5401 MOSFET IRF640 OPAMP, QUAD Q1, 19, 23 Q18, 22 TL074CDR U2, 3 3 Collector 1. G Base 2. D 3. S 1 Emitter MPSW06RLRA, MPSW56RLRAMPQ, MPS2222ARLRA, OPAMP, DUAL 2N5551 TIP31C TL072CDR SO-8,... -
Page 26: Schematics
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