JBL-TLXPS12-sub-sm 电路图 维修手册.pdf

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1、JBL Consumer Products Inc. 250 Crossways Park Drive Woodbury, N.Y. 11797 A Harman International Company 1112-TLXPS12 Rev A S E R V I C EM A N U A L TLX PS12 Discrete Output, High Current 12 Powered Subwoofer RadioFans.CN 收音机爱 好者资料库 1 Powered SubwooferTLX PS12 TABLE OF CONTENTS Specifications .1 Warr

2、anty.2 Safety Symbols .2 Controls and Their Functions.3 Test Procedure.4 Trouble Shooting Before Opening.5 Removing the Amplifier.5 Trouble Shooting After Removal .5 Components Requiring Exact Replacement.6 Block Diagram.7 Amplifier Exploded View.8 Cabinet Exploded View.9 Parts Lists.10 Packaging an

3、d Shipping.12 Integrated Circuit Diagrams.13 Printed Circuit Boards .14 Schematic Diagrams .16 SPECIFICATIONS Amplifier Power RMS.120 Watts Drivers .12 with high-polymer-laminated cones Inputs.Line level and Speaker Level Outputs*.High level with High-Pass filter at 180Hz Crossover Frequency.50-150H

4、z (continuosly variable) Frequency Response.23Hz to (50-150Hz) (-6dB) External Dimensions (Inches) Height.19 3/4 Width.15 Depth.16 3/4 Weight .43 lbs Shipping Weight .49 lbs External Dimensions (mm) Height.502 mm Width.381 mm Depth.426 mm Weight .19.5 kg Shipping Weight .22.3 kg * High-Level (speake

5、r) outputs are active only if high-level input are used. Occasional refinements may be made to existing products without notice, but will always meet or exceed original specifications unless otherwise stated. RadioFans.CN 收音机爱 好者资料库 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

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8、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

9、 ? ? RadioFans.CN 收音机爱 好者资料库 3 Powered SubwooferTLX PS12 CONTROLS AND THEIR FUNCTION 1. Output Level - The Output Level adjustment determines volume level strength. 2. Crossover Frequency - The Crossover Frequency adjustment determines the highest frequency the TLX PS10 will reproduce. It allows a s

10、eamless transition from the subwoofer to the satellite speakers. 3. On (LED) - This LED will light green when the unit is plugged in and is receiving signal. When in standby mode the LED is red. 4. Low Level Input - These left and right Line Level Inputs are normally used when the receiver/ processo

11、r has line-level “pre-amp out” or subwoofer out” jacks. 5. Phase Switch - The Phase switch is used to adjust the relative polarity of the subwoofer. Normally this switch is set to “0”. 6. High Level Inputs - These High Level Inputs are for receivers that dont have line-level “pre-amp out” or “subwoo

12、fer out” jacks. When a pair of main or satellite speakers are attached to the OUTPUT terminals, frequencies below 180 Hz are attenuated by the high-pass filter. 7. Fuse - Use only a slow-blo 2.0A 250V GMC fuse. 4 Powered SubwooferTLX PS12 TEST PROCEDURES General Function UUT = Unit Under Test 1.Conn

13、ect both right and left line level inputs (RCA) to signal generator and UUT. Use Y-cable if necessary from mono source. VOLUME control should be full counterclockwise. 2.Turn on generator, adjust to 50mV, 50 Hz. 3.Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise. 4.LED should tu

14、rn Green; immediate bass response should be heard and felt from port tube opening. 5.Turn off generator, turn VOLUME control fully counterclockwise, disconnect RCA cables. 6.Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amp

15、lifier fed by the signal generator. 7.Turn on generator and adjust so that speaker level output is 2.0V, 50 Hz. Turn VOLUME control full clockwise. 8.Green LED should light, immediate bass response should be heard and felt from the port tube opening. Sweep Function 1.Follow steps 1-4 above, using a

16、sweep generator as a signal source. 2.Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test. Driver Function 1.Remove driver from cabinet; detach + and - wire clips. 2.Check D

17、C resistance of driver; it should be 3.3 ohms. 3.Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V. 4.Sweep generator from 20Hz to 1kHz. Listen to dr

18、iver for any rubbing, buzzing, or other unusual noises. 5 Powered SubwooferTLX PS12 1. TROUBLE SHOOTING BEFORE OPENING Check connections, control settings, driver and other possible external problems. If there is Output, determine if all controls and Inputs function properly. Rotate Pots over full r

19、ange while applying lateral and vertical oscillating forces to locate possible intermittent function. High Level Inputs should be tested individually both differentially (signal from - to + with normal output) and in common mode (signal from low level ground to both + and - shorted together, giving

20、virtually no output). While passing a signal, corner drop the enclosure a few inches to expose possible intermittent problems. Check woofer for rubbing of voice coil or tears in cone or surround. Check cabinet for loose extraneous articles which may have been pushed into front port. 2. REMOVING THE

21、AMPLIFIER. There are voltages and hot components at many points in the amplifier which can, if contacted, cause personal injury. Be extremely careful. Any adjustments or service procedures that require operation of the amplifier out of its enclosure should be performed only by trained service person

22、nel. Refer to PCB drawings for locations of hazards and familiarize yourself with their locations before starting. 3. TROUBLE SHOOTING AFTER REMOVAL Verify AC plug is disconnected See WARNINGS in section 2. To prevent loose hardware from reducing safety spacings, it is essential that all hardware be

23、 replaced in the same manner as it was removed, with lock washers under all nuts, proper torque on screws and thread locking sealer on the transformer nuts. If line core, its strain relief, or the AC switch are replaced, it is necessary to seal them completely to panel with an approved conformal coa

24、ting to prevent air whistling through any openings from woofer pressure. To reduce the risk or electric shock and/or fire, replace items as marked on schematic with the safety marking only with the exact replacements listed in the safety component list, section 5.If exact replacements are not availa

25、ble, order them from the factory or an authorized service center. A.)Check fuse F1. If blown visually check transformer for discoloration, and large capacitors (C36, C37) for bulges or venting. Check for shorts in Q3-Q7 with an Ohmmeter, (see schematic). B.With ohmmeter, verify contacts of thermosta

26、t are closed, voice coil of woofer is 3.3 ohms, and windings of transformer are continuous. C.Examine board and wiring for obvious damage, broken or poorly soldered connections, or discoloration. D.Repair or replace items identified above. Procedures for replacing power transistors and removing PCB

27、are as follows: Use low power, grounded temperature regulated iron with small tip such as Weller PTA7 and ESD control. Use SN63/37 solder 0.032 diameter with no clean flux core, Alpha Metals P2 or equal. I)Replacing power transistors: Clip all 3 leads near body of transistor. Remove screw and discar

28、d device (keep hardware and insulator). Holding each lead in turn with needle nose BEFORE THIS AMPLIFIER IS PLUGGED IN, make sure its rated voltage corresponds to the voltage of the AC power source to be employed. Failure to use the correct voltage could cause damage to the amplifier when the AC pow

29、er cable is plugged in. Do not exceed the rated voltage by more than 10%; operation below 90% will degrade performance or cause the unit to shut off. 6 Powered SubwooferTLX PS12 pliers, gently heat and remove cut lead from hole in edge or PCB. Clean insulator and seating area on back of panel. Coat

30、both sides of insulator with silicon (white) thermal compound (unless silicone rubber pads are provided), position it centered on back of device with holes aligned. Insert leads into PCB then place pair over hole in panel; ensure hole in insulator is aligned. Insert screw from far side, pass shoulde

31、r bushing over screw and carefully seat shoulder in hole in tab, add flat washer, lock washer and nut (finger tight). Center insulator tighten screw first then solder all three leads in respective slots with full fillet, being careful not to bridge pads. Use ohmmeter to verify there is no short from

32、 tab of transistor to panel, or between pads. Never operate amplifier with load connected when PC assembly is not attached to panel or when any of output transistors is not properly screwed to panel. After repair, inspect for possible safety hazards, including loose hardware, missing lock washers, c

33、orrect fuse and lead dress of primary wires (these must be held in position with cable ties so that they cannot touch secondary components).With ohmmeter, check that panel is connected to signal ground. It is essential that the following safety insulation test be performed prior to returning the Pow

34、er Sub-Woofer to the customer, using one of the following methods: A) Insulation Resistance Test With a 500VDC Insulation Tester, Check insulation from the outer metal contact of the RCA jack (chassis) to the line neutral of AC cord. Resistance should be 100M. B) Hi-Pot Test If a UL approved Hi-Pot

35、tester is available, test line & neutral of AC cord to outer shell of RCA jack (chassis) at 1100VAC for 2 seconds. Observe all of instrument manufacturers instructions and safety warnings in performing this test. Connect sub-woofer system to a music source. Play at high level while checking for air

36、leaks around panel edge, driver, panel jacks and controls, and voice coil problems such as rubbing or loose turns.With the crossover frequency set to 50Hz, very little of the voice content should be heard. 4. LIST OF SAFETY COMPONENTS REQUIRING EXACT REPLACEMENTS F1Fuse SLOW BLO 2.0A 250v GMC 20mm U

37、L approved. FHFuse holder. Use only factory replacement. PWR CORDSPT-2 better with polarized plug, UL appoved wired with the hot side to fused side. Use with UL approved panel strain relief only. XFtransformer. use only factory replacement. BD1Bridge diode. Use only factory replacement. C36, 376800u

38、F, 63V electronic filter caps. Be sure replacement part is at least the same working voltage and capacitance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressures and vibration. K1Safe operating area relay to protect output devices. Use only factory replacement. R645.6 .5W METAL FILM, non flammable. 7 Powered SubwooferTLX PS12 TLX PS12 AMPLIFIER BLOCK DIAGRAM 8 Powered SubwooferTLX PS12 AMPLIFIER EXPLODED VIEW