Infinity Reference475a free download

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Reference Series 475a 4,3,2 CHANNEL POWER AMPLIFIER SERVICE MANUAL Infinity Systems, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Released 2007 Discontinued XXXX Rev1 3/2008 475a Reference Series - CONTENTS BASIC SPECIFICATIONS ...1 DETAILED SPECIFICATIONS ...2 PACKING...3 APPLICATIONS...4 INSTALLATION/SETUP...6 BASIC TROUBLESHOOTING...6 EXPLODED VIEW/PARTS LIST...7 NOTE ON TOP COVER...8 AMPLIFIER BLOCK DIAGRAM...9 P.C.B. DRAWINGS...10 ELECTRICAL PARTS LIST ... 16 IC/TRANSISTOR PINOUTS...21 SCHEMATICS...22 Reference 475a Basic Specifications Output Power: (14.4 VDC) Signal-to-noise ratio: Dynamic power: Effective damping factor: Frequency response: Maximum input signal: Maximum sensitivity: Output regulation: Dimensions (L x W x D): Fuse: 75W RMS x 4 @ 4 ohms; 1% THD + N 90W RMS x 4 @ 2 ohms; 1% THD + N 85dBA (reference 1W into 4 ohms) 117W channels @ 2 ohms 6.3 @ 4 ohms 10Hz ­ 100kHz (-3dB) 6.0V 100mV 0.21dB @ 4 ohms 14-3/16" x 9" x 2-11/16" (361mm x 229mm x 69mm) 2 x 35A Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in this and related JBL publications are therefore subject to change without notice. 1 475a Reference Series INFINITY REFERENCE 475a AMPLIFIER SPECIFICATIONS TEST VOLTAGE 14.4 +0.1V Specification Power Output 4ohm loads @1kHz (stereo mode) for each ch @<1.0%THD (Unit:W)(LPF=22K) Power Output 2ohm loads @1kHz (stereo mode) for each ch @<1.0%THD (Unit:W)(LPF=22K) Bridged (Stereo) Mode 4ohm loads @1kHz THD Power 4 ohm loads and 1MD@Reference (Unit:%) LPF=22K THD Power 2 ohm loads and 1MD@Reference (Unit:%) LPF=22K THD Power 4 ohm loads Bridged (Stereo) Mode (Unit:%) LPF=22K Channel Separation @full rated power (+80KHZ) @1kHz Full rated power Distortion 1KHz LPF=22KHz Signal/Noise Ratio a: 1 watt into 4 ohms b: full rated power (dB) Input Sensitivity Low Level Input(v) @:full rated power Frequency response (Unit:-3dB) High-Pass Crossover Frequency limits +20% Low-Pass Crossover Frequency limits +20% Bass Boost:(Unit:dB) @50Hz (±5Hz ) Idle Current ( @ 4ohm) MAX current : rated power (All channel 2 ohm loads) DC Offset: Damping Factor (4ohm): Effective damping factor (4ohm): Dynamic Power @ 2 ohms Output Regulation @ 4 ohms Remote Operating Voltages: Turn on delay time Circuit Protection a. Temperature b. Speaker Short Circuit c. Operating Voltage Range Dimensions (L x W x H): Fuses Rating 75W x 4 Unit Watts Remarks 90W x 4 240W x 2 0.5% @1kHz 0.5%