JBL Northridge E250P Service Manual
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JBL Northridge E250P Service Manual

Northridge e-series powered subwoofer
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See also: Owner's Manual , Preliminary Service Manual
Northridge
E-Series
™
E250P
Powered Subwoofer
Service Manual
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797
Rev2 2/2004

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Summary of Contents for JBL Northridge 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: Table Of Contents

    (502mm x 365mm x 419mm) Weight: 43 lb/19.5kg 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.

  • Page 3: Safety Information

    E250P SAFETY INFORMATION Warning List of Safety Components Requiring Exact Replacements Any person performing service of this unit will be exposed to hazardous voltages and the risk of electric shock. It is assumed that any person who removes the amplifier from...

  • Page 4: Detailed Specifications

    E250P JBL E250P 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 Conditions Notes Amp Section Type (Class AB, D, other)
  • Page 5 (+) and negative (–) terminals. It proper connections, and any which description best is important to connect both damage to JBL or other equip- matches your system and speakers identically: ment due to improper connec- follow the corresponding...

  • Page 6: Connections

    E250P Analog Receiver/Processor – Speaker-Level Connections Use this installation method the left high-level inputs on speaker and left input on the only with an analog receiver/ the subwoofer. Insert the subwoofer, and then for the (+) processor that does not have joined (twisted) wires into the and (–) connections for the...
  • Page 7 E250P Analog Receiver/Processor – Line-Level Connections Use this installation method may connect the subwoofer with an analog receiver/ output on your receiver/pre- processor that does not have amplifier to either the left or digital processing or bass right line-level input on the management, and that is subwoofer.

  • Page 8: Operation

    LED on the top of the unit will signal to the subwoofer is woofer can be turned off, turn red. When a signal is removed. Due to JBL’s unique whenever desired, if you do present, the LED will turn high-output, high-efficiency not wish to leave it in auto green.

  • Page 9: Basic Troubleshooting

    E250P Phase Control The Phase Control determines bass output at the listening If at some time in the future whether the subwoofer’s pis- position. you happen to rearrange your ton-like action moves in and listening room and move your Remember, every system,...

  • Page 10: Exploded View/Parts List

    E250P Amplifier – Not for Sale Exploded View Ref# Part Number Description 351348-001 PLATE,LED/LOGO-E250P 338125-002 ASY,LED-E250P/E250P 336486-001 ASY,FOOT,PLSTC- E250P 763-31110-40 SCREW, 8 X 2 1/2,TR,PH,PB,BLK ZINC,LCS (FOOT) 908302-012 SCREW, PB,HXS,#6x.75,ZINC (LOGO PLATE) 903802-016 SCREW, PB,HXS,#8x1",ZINC (WOOFER) 338128-002 ASY, WOOFER,12" DCR 4.8 Ω...

  • Page 11: Test Set-Up And Procedure

    E250P TEST SET-UP AND PROCEDURE General Function UUT = Unit Under Test 1) Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. LEVEL control should be full counterclockwise (MIN). Make sure the LFE/Normal switch is in the NORMAL position.

  • Page 12: Amplifier Block Diagram

    E250P...

  • Page 13: Tech Tip Jbltt2003-04

    In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use ONLY the JBL 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 14: Detailed Troubleshooting

    E250P DETAILED TROUBLESHOOTING A. Power Amp Section Resistance from S+ (SPK O/P) to GND should be >1M Ω (NO LOAD) Resistance Check Resistance from V+ (C6 P+) to V- (C8 P-) gradually Fully CHARGED should read >10k Ω Resistance from V+ (C6 P+) to S+ (SPK O/P) should read >1MΩ...
  • Page 15 E250P DETAILED TROUBLESHOOTING (CONT'D) - 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 16 E250P DETAILED TROUBLESHOOTING (CONT'D) 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+.

  • Page 17: Drawings

    E250P...
  • Page 18 E250P...
  • Page 19 E250P...
  • Page 20 E250P...

  • Page 21: Electrical Parts List

    E250P E250P Electrical Parts List Part Number Description Reference Designator Resistors 020-220497-120 Carbon Film 2K2 1/4W J 1K 1W J 021-100401-120 MOF Resistor R103 021-120403-020 MOF Resistor 1K2 3WS J 8x20 021-120405-020 MOF Resistor 1K2 5WS J 8x25 021-220202-120 MOF Resistor...
  • Page 22 E250P Part Number Description Reference Designator 024-470698-120 SMD Resistor 470K 1/8W J 0805 024-470798-120 SMD Resistor 4M7 1/8W J 0805 024-487498-100 SMD Resistor 4K87 1/8W F 0805 R51,53 024-510398-120 SMD Resistor 510R 1/8W J 0805 024-560598-120 SMD Resistor 56K 1/8W J 0805...
  • Page 23 E250P Part Number Description Reference Designator 051-005600-100 PNP Transistor PN:MPSW56RLRA TO-92 (ON) 051-222200-100 NPN Transistor PN:MPS2222ARLRA TO-92 051-290700-100 PNP Transistor PN:MPS2907A RLRA TO-92 Q19,23 051-540101-000 PNP Transistor PN:2N5401 TO-92 051-555100-000 NPN Transistor PN:2N5551 TO-92 051-640001-000 MOSFET N-Channel PN:IRF640N TO-220 (IR)
  • Page 24 E250P Part Number Description Reference Designator 061-400014-000 Rubber Foot ID:6.2 OD:11.5 t=2mm blk 061-700044-000 Mycar 13x18mm TO-220 063-010012-000 Brckt for pwr transistor P/N:TRK-1 063-321100-001 Plate 322x105.7x15mm BLK (94V0)ABS 063-531808-000 Bucket 322x105.7x146.5mm blk (94VO) 066-120300-900 Cable Tie CV-120S 071-100608-100 Fiber Washer OD=8mm ID=3.2 t=1 (red)

  • Page 25: Ic/Transistor Pinouts

    E250P Semiconductor Pinout Diagrams 2N5401 MOSFET IRF640 OPAMP, QUAD Q18, 22 TL074CDR U2, 3 3 Collector 1. G Base 2. D 3. S 1 Emitter MPSW06RLRA, MPSW56RLRAMPQ, MPS2222ARLRA, OPAMP, DUAL 2N2907A, 2N5551, TIP31C TL072CDR SO-8, Q2, 16, 3, 21, 19, 23, 17...

  • Page 26: Schematics

    E250P SCHEMATICS NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND...
  • Page 27 NOTE: THIS VOLTAGE IS REFERENCED TO -V, NOT CIRCUIT GROUND E250P...

  • Page 28: Packing

    E250P Packaging Ref# Part Number Description 351249-002 MANUAL, OWNER-E250P/E250P 351249-001 CARTON,MASTER-E250P (BEECH MODEL) 351249-003 CARTON,MASTER-E250P (BLACK MODEL) 350884-003 CARTON,MASTER-E250P (CHERRY MODEL) 351252-001 PAD,END,TOP-E250P 351252-002 PAD,END,BOT-E250P 338381-001 WARRANTY CARD,1/5YR,JBL 352024-001 ASY, GRILLE, BLK, FRNT...

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