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1、S E R V I C EM A N U A L ARC SUB JBL Consumer Products Inc. 250 Crossways Park Drive Woodbury, N.Y. 11797 A Harman International Company 1112-ARCSUB Rev A 4/98 S E R V I C EM A N U A L ARC SUB Discrete Output, High Current 8 Powered Subwoofer RadioFans.CN 收音机爱 好者资料库 1 Powered SubwooferARC SUB TABLE
2、OF CONTENTS Specifications .1 Warranty.2 Safety Symbols .2 Controls and Their Functions.3 Test Procedures.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
3、 View.9 Parts Lists.10 Packaging and Shipping.12 Integrated Circuit Diagrams.13 Printed Circuit Boards .14 Schematic Diagrams .16 SPECIFICATIONS Amplifier Power RMS.75 Watts Drivers .8 with high-polymer-laminated cones Inputs.Line level and High Level Outputs*.High level with High-Pass filter at 180
4、Hz Crossover Frequency.50-150Hz (continuosly variable) Frequency Response.45Hz to (50 - 150Hz) (determined by crossover setting) External Dimensions (Inches) Height.9 1/4 Width.14 Depth.12 1/2 Weight .23 lbs External Dimensions (mm) Height.235 mm Width.356 mm Depth.318 mm Weight .10.5 kg * High-Leve
5、l (speaker) 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 2 Powered SubwooferARC SUB WARRANTY This amplifier is warr
6、anted against defects in material and workmanship for a period of 90 days from date of shipment, when installed in accordance with the owners manual in a clean, dry, interior home environment. THIS AMPLIFIER IS NOT SUITABLE FOR OPERATION OUTSIDE OR IN HARSH ENVIRONMENTS.During the warranty period, t
7、he manufacturer will, at its option, either repair of replace products which prove to be defective. For warranty service or repair, this product must be properly packed and returned to a service facility designated by the manufacturer.Buyer shall prepay shipping charges to the designated facility an
8、d the manufacturer shall pay shipping charges to return the product to buyer.However, Buyer shall pay all shipping charges, duties and taxes for products returned to the manufacturer from another country. The manufacturer does not warrant that the operation of the product will be uninterrupted or er
9、ror-free. The Buyer must determine the suitability of the product for his or her purposes. LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied interfacing, unauthorized modification or misuse, operation o
10、utside of the environment specifications for the product including inadequate ventilation, or improper site preparation, installation, or maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED.THE MANUFACTURER SPECIFICALLY DISCLAIMSTHEIMPLIEDWARRANTIESOF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
11、PURPOSE. EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLEANDEXCLUSIVEREMEDIES.THE MANUFACTURER SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. SAFETY SYMBOLS The following symbols
12、are used throughout this manual and in the product.Familiarize yourself with each of the symbols and its meaning before servicing this amplifier. Instruction manual symbol. The product will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to pr
13、otect the unit against damage. Indicates dangerous voltages are present. Be extremely careful. The CAUTION sign denoted a hazard.It calls attention to a procedure which, if not correctly performed or adhered to, could result in damage to or destruction of the amplifier.Do not proceed beyond a CAUTIO
14、N sign until the indicated conditions are fully understood and met. The WARNING sign denotes a hazard.It calls attention to a procedure which, if not correctly performed or adhered to could result in injury or loss of life.Do not proceed beyond a WARNING sign until the indicated conditions are fully
15、 understood and met. GENERAL SAFETY CONSIDERATIONS THIS UNIT DOES NOT HAVE A POWER SWITCH; HAZARDOUS VOLTAGES ARE PRESENT WITHIN THE UNIT WHENEVER IT IS PLUGGED IN.This still applies when the over-temperature thermostat opens, as it may automatically reset at any time. There are voltages and hot com
16、ponents at many points in the amplifier which can, if contacted, cause serious 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 personnel. RadioFans.CN 收音机爱 好者资料库 3 Powered Subw
17、ooferARC SUB 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 ARC SUB will reproduce. It allows a seamless transition from the subwoofer to the
18、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/processor has line-level “pre-amp out ” or “subwoofer
19、out” jacks. 5. Fuse - Use only a slow-blo 1.0A 250V GMC fuse. 6. High Level Inputs - These High Level Inputs are for receivers that do not have line-level “pre-amp out” or “subwoofer out” jacks. When a pair of main or satellite speakers are attached to the OUTPUT terminals, frequencies below 180 Hz
20、are attenuated by the high-pass filter. 4 Powered SubwooferARC SUB TEST PROCEDURES General Function UUT = Unit Under Test 1.Connect 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.Tu
21、rn on generator, adjust to 50mV, 50 Hz. 3.Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise. 4.LED should turn 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.
22、6.Connect one pair of speaker cables to either high level input terminal on 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 2.0V, 50 Hz. Turn VOLUME control full clockwise. 8.Green LED should light
23、, immediate bass response should be heard and felt from the port tube opening. Sweep Function 1.Follow steps 1-4 above, using a 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 unus
24、ual noises are heard, remove driver and test. Driver Function 1.Remove driver from cabinet; detach + and - wire clips. 2.Check DC resistance of driver; it should be 3.0 ohms. 3.Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal
25、 generator and adjust so that speaker level output is 5.0V. 4.Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises. 5 Powered SubwooferARC SUB 1. TROUBLE SHOOTING BEFORE OPENING Check connections, control settings, driver and other possible external p
26、roblems. If there is Output, determine if all controls and Inputs function properly. Rotate Pots over full range while applying lateral and vertical oscillating forces to locate possible intermittent function. High Level Inputs should be tested individually both differentially (signal from - to + wi
27、th normal output) and in common mode (signal from low level ground to both + and - shorted together, giving 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 surrou
28、nd. Check cabinet for loose extraneous articles which may have been pushed into front port. 2. REMOVING THE 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 tha
29、t require operation of the amplifier out of its enclosure should be performed only by trained service personnel. 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 WARNING
30、S in section 2. To prevent loose hardware from reducing safety spacings, it is essential that all hardware be 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, o
31、r the AC switch are replaced, it is necessary to seal them completely to panel with an approved conformal coating 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 wi
32、th the exact replacements listed in the safety component list, section 5.If exact replacements are not available, 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 ventin
33、g. Check for shorts in Q3-Q7 with an Ohmmeter, (see schematic). B.With ohmmeter, verify contacts of thermostat are closed, voice coil of woofer is 3.0 ohms, and windings of transformer are continuous. C.Examine board and wiring for obvious damage, broken or poorly soldered connections, or discolorat
34、ion. D.Repair or replace items identified above. Procedures for replacing power transistors and removing PCB 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
35、P2 or equal. I)Replacing power transistors: Clip all 3 leads near body of transistor. Remove screw and discard 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
36、source to be employed. Failure to use the correct voltage could cause damage to the amplifier when the AC power 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 SubwooferARC SUB pliers, gently
37、 heat and remove cut lead from hole in edge or PCB. Clean insulator and seating area on back of panel. Coat 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
38、place pair over hole in panel; ensure hole in insulator is aligned. Insert screw from far side, pass shoulder 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 respec
39、tive slots with full fillet, being careful not to bridge pads. Use ohmmeter to verify there is no short from 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
40、 panel. After repair, inspect for possible safety hazards, including loose hardware, missing lock washers, correct 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 sign
41、al ground. It is essential that the following safety insulation test be performed prior to returning the Power 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
42、(chassis) to the line neutral of AC cord. Resistance should be 100M. B) Hi-Pot Test If a UL approved Hi-Pot 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 p
43、erforming this test. Connect sub-woofer system to a music source. Play at high level while checking for air 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 sho
44、uld be heard. 4. LIST OF SAFETY COMPONENTS REQUIRING EXACT REPLACEMENTS F1Fuse SLOW BLO 1A 250v GMC UL 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. XFTra
45、nsformer. Use only factory replacement BD1Bridge diode. Use only factory replacement. C36, 374700uF, 50V 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
46、 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 SubwooferARC SUB ARC SUB AMPLIFIER BLOCK DIAGRAM 8 Powered SubwooferARC SUB AMPLIFIER EXPLODED VIEW 9 Powered SubwooferARC SUB CABINET EXPLODED VIEW 10 Powered SubwooferARC SUB ELECTRICAL PARTS LIST Ref. NumberPart NumberDescriptionQuantity Capacitors C1, 2130001529100UF 100V NP
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