JBL LS120P free download

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LSTM Series LS120P Amplifier/Subwoofer SERVICE MANUAL JBL Consumer Products 250 Crossways Park Dr. Woodbury, New York 11797 Released 2008 Discontinued XXXX Rev0 4/2008 LS120P - CONTENTS BASIC SPECIFICATIONS ...1 DETAILED SPECIFICATIONS ...2 PACKING...4 CONTROLS/CONNECTIONS...5 OPERATION ...7 EXPLODED VIEW/PARTS LIST...8 TEST SET-UP AND PROCEDURE...9 AMPLIFIER BLOCK DIAGRAM...10 DETAILED TROUBLESHOOTING... ...12 P.C.B. DRAWINGS...13 ELECTRICAL PARTS LIST ...18 IC/TRANSISTOR PINOUTS...22 SCHEMATICS...23 LS120P SPECIFICATIONS Amplifier Power (RMS): Peak Dynamic Power *: Driver: Inputs: Low-Pass Frequency: 400 Watts 700 Watts 12" (305mm) PolyPlasTM Line Level (switchable to LFE) Variable from 50Hz to 150Hz (24dB/octave, continuously variable) Frequency Response: Dimensions (H x W x D): (with feet, controls, grille, etc.) Weight: 25Hz ­ 150Hz (or Low-pass crossover setting) 20-1/16" x 14-3/4" x 17-1/4" (510mm x 375mm x 438mm) 57 lb/25.8kg JBL 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. * The Peak Dynamic Power is measured by recording the highest center-to-peak voltage measured across the output of a resistive load equal to minimum impedance of the transducer, using a 50Hz sine wave burst, 3 cycles on, 17 cycles off. 1 LS120P JBL LS Sub 250W Powered Sub Amp LINE VOLTAGE US 120vac/60Hz EU 230vac/50-60Hz Yes/No Yes Yes Hi/Lo Line 108-132 207-253 Nom. 120 230 Unit Vrms Vrms Notes Normal Operation Normal operation, MOMS Parameter Amp Section Type (Class AB, D, other) Load Impedance (Driver min) System average impedance from 20 to 500 Hz Driver size Rated Output Power (120VAC) Rated Output Power (230VAC) Specification D 4 8.65 12 250 269 Unit n/a Ohms Ohms inches Watts Watts QA Test Limits n/a n/a n/a n/a 240 250 Conditions Notes Nominal Reference Reference Domestic version only 120 EU Version only 230 VAC-50-60 Hz Average RMS power, 3/20 Cycles 50 Hz, Driven 6dB above its input sensitivity sensitivity, average of the first 22k filter 22k filter @ Speaker Outputs Measured at Measured at the speaker amplifier board cable. 150 Watts @ THD < AVG RMS Dynamic Power THD @ Rated Power THD @ 1 Watt DC Offset Damping factor Input Sensitivity Input Frequency L&R LFE input System Gain System Gain in dB Signal to Noise SNR-A-Weighted SNR-unweighted SNR rel. 1W-unweighted 210 0.5 0.2 50 >50 Watts % % mV-DC DF 270 1 0.5 50 20 50 22 22