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Northridge

™

E-Series

E250P

Powered Subwoofer

Service Manual

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797

Rev

2 2/2004

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Summary of Contents for E250P

Page 1: ...Northridge E Series E250P Powered Subwoofer Service Manual JBL Consumer Products 250 Crossways Park Dr Woodbury New York 11797 Rev2 2 2004...

Page 2: ...chable to LFE and Speaker Level with 5 way binding posts Low Pass Frequency Variable from 50Hz to 150Hz Frequency Response 25Hz Low pass crossover setting Dimensions H x W x D 19 3 4 x 14 3 8 x 16 1 2...

Page 3: ...nce 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 probl...

Page 4: ...esidual Noise Floor 1 5 mVrms max 2 Volume max w A P Swept Bandpass Measurement Line freq harmonics BW 20 Khz Line level inputs must be terminated using 1KOHM Input Impedance Line Input L R LFE 10K oh...

Page 5: ...CONNECTION When we designed the E150P and E250P powered subwoofers our goal was to offer the user the best pos sible performance combined with the most flexible and complete installation options Plea...

Page 6: ...e front left and right speakers or the subwoofer Refer to the connection dia gram for guidance Twist together the leads at one end of the speaker wires that you have designated for the left front spea...

Page 7: ...R PREAMPLIFIER L R For LFE use L or R Analog Receiver Processor Line Level Connections Use this installation method with an analog receiver processor that does not have digital processing or bass mana...

Page 8: ...er level adjustment depends on sev eral variables such as room size subwoofer placement type of main speakers and position Adjust the subwoofer level so that the volume of the bass information is plea...

Page 9: ...and there is no sound from the subwoofer Check that the receiver amplifier is on and a source is playing Check that the powered subwoofer is plugged into an active electrical outlet and is switched o...

Page 10: ...INC LOGO PLATE 4 11 903802 016 SCREW PB HXS 8x1 ZINC WOOFER 8 12 338128 002 ASY WOOFER 12 DCR 4 8 1 13 336799 001 ASY PORT TUBE 1 14 351307 001 GRILLE BLK FRNT 1 15 333249 003 CUP GRILLE TITANIUM BEEC...

Page 11: ...n UUT Cables should be connected to an integrated amplifier fed by the signal generator 7 Turn on generator and adjust so that speaker level output is 1 0V 50Hz Turn LEVEL control full clockwise MAX 8...

Page 12: ...E250P 11...

Page 13: ...s International Rectifier or Fairchild Replace both Q18 and Q22 MOSFET s in the circuit even if only one seems to be damaged Do NOT mix match these components from different manufacturers or batches T...

Page 14: ...U4 1 P U4 7 RED 0Vrms 11 84VDC GREEN 7 13Vrms 12 93VDC 3 D C Operation Voltage measurements DVM on CLASS D POWER AMP Between V Q4 E Q1 C Q10 C U7 1 U7 2 U7 4 U7 6 U7 7 U7 8 And This Point GND V GND GN...

Page 15: ...l to High level input Voltage measurements 15 3V at speaker output 3 Low Pass Set up Set Generator at 200 mV 100Hz Signal to Line level input Measure voltage at S speaker output Voltage measurement X...

Page 16: ...ctifier C6 and C8 Use scope to check switching frequency U6 7 100KHz 10 24Vp p Check Q4 E TO V 0V D C Power up with no signal input LED RED OK OK OK OK OK OK OK OK Check MUTE 8V and Q24 Q25 Q26 Use sc...

Page 17: ...E250P 16...

Page 18: ...E250P 17...

Page 19: ...E250P 18...

Page 20: ...E250P 19...

Page 21: ...8W J 0805 R29 1 024 187698 100 SMD Resistor 187K 1 8W F 0805 R45 1 024 200598 120 SMD Resistor 20K 1 8W J 0805 R94 1 024 220398 120 SMD Resistor 220R 1 8W J 0805 R90 1 024 220498 121 SMD Resistor 2K2...

Page 22: ...1 470244 102 SMD Capacitor 0u047 50V K 0805 X7R C62 59 2 031 560243 100 SMD Capacitor 56pF 50V J 0805 NPO C57 61 2 031 560343 102 SMD Capacitor 560pF 50V J 0805 NPO C56 1 032 100484 200 Mylar Capacito...

Page 23: ...8M TE3 DMP 8 U4 1 054 050601 100 SMD ZENER DIODE PN BZX84C5V6 5 6V SOT 23 D24 36 37 3 054 414803 100 SMD DIODE PN LL4148 Wishay D1 4 8 10 23 27 28 21 054 540100 100 SMD Zener Diode PN MMBT5401 LT1 SOT...

Page 24: ...l PC250 t 0 8 T250MA 072 040096 000 Terminal T187MA t 0 8mm PC187 0 8 AC1 AC3 T1 T2 AC2 SW2 SW4 072 040169 000 Connector 2 PIN JS 1001 2 P 2 5mm 072 060170 000 B P W Accessory Parts 073 032315 601 Bla...

Page 25: ...2N5401 Q1 2 Base 3 Collector 1 Emitter 1 2 3 MPSW06RLRA MPSW56RLRAMPQ MPS2222ARLRA 2N2907A 2N5551 Q2 16 3 21 19 23 17 MOSFET IRF640 Q18 22 TIP31C Q4 MMBT3904LTI SOT23 MMBT3906LTI SOT23 DTC114EK SMT3 M...

Page 26: ...E250P SCHEMATICS 25 NOTE THIS VOLTAGE IS REFERENCED TO V NOT CIRCUIT GROUND NOTE THIS VOLTAGE IS REFERENCED TO V NOT CIRCUIT GROUND...

Page 27: ...E250P 26...

Page 28: ...P E250P 1 2 351249 001 CARTON MASTER E250P BEECH MODEL 1 351249 003 CARTON MASTER E250P BLACK MODEL 1 350884 003 CARTON MASTER E250P CHERRY MODEL 1 3 351252 001 PAD END TOP E250P 1 4 351252 002 PAD EN...

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