Infinity-BU150-sub-sm 电路图 维修手册.pdf

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1、Infinity Systems Inc. 250 Crossways Park Drive Woodbury, N.Y. 11797 1-800-553-3332 A Harman International Company Rev A 3/2000 BU-150 Powered Subwoofer SERVICE MANUAL RadioFans.CN 收音机爱 好者资料库 SAFETY INFORMATION Warning Any person performing service of this unit will be exposed to hazardous voltages a

2、nd the risk of electric shock.It is assumed that any person who removes the amplifier from this cabinet hasbeen properly trained in protecting against avoidable injury and shock.Therefore, any service procedures are to be performed by qualified service personal ONLY! Caution This unit does not have

3、a power switch. Hazardous voltages are present within the unit whenever it is plugged in. Before the amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is plugge

4、d in. Do not exceed rated voltage by more than 10%: operation below 90% of rated voltage will cause poor performance or may shut the unit off. List of Safety Components Requiring Exact Replacements F1Fuse SLO BLO 1.5A 250V 20mm. UL approved PWRCORDSPT-2 or better with polarized plug, UL approved wir

5、ed with the hot side to fused side. Use with factory replacement panel strain relief only. T1Transformer. Use only factory replacement. DBRBridge diode. Use only factory replacement. C1, 22200uF, 100V electrolytic filter caps. Be sure replacement part is at least the same working voltage and capacit

6、ance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration. C64.7uF 100V electrolytic radial S64AMIPower output module. Use only factory replacement FaceplateFaceplate. Use only factory replacement Air leak cover Use

7、only factory replacement CMC1Use only factory replacement L1Use only factory replacement Fuse PCBUse only factory replacement Main PCBUse only factory replacement Leakage/Resistance Check Before returning the unit to the customer, perform a leakage or resistance test as follows: Leakage Current. Not

8、e there is no power switch on this unit. When the power plug is plugged in, the unit is live. Connect the unit to its rated power source. Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test. if leakage current exceeds 0.5mA, the u

9、nit is defective. Reverse the polarity of the AC supply and repeat. Resistance. Measure the resistance 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 pr

10、oblem is located and corrected. 2 Amplifier/SubwooferBU-150 RadioFans.CN 收音机爱 好者资料库 3 Amplifier/SubwooferBU-150 GENERAL SPECIFICATIONS Frequency Response (?3dB) . . . . . . . . . . . . . . . . . 28Hz 150Hz Output (RMS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200W Driver . . . . . .

11、. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Woofer Crossover Frequency . . . . . . . . . . . . . . . . . . . . . . . 50Hz 150Hz (continuously variable) Dimensions (H x W x D) . . . . . . . . . . . . . . . . . . . . . 17 ? x 17 ? x 17 ? (451 x 451 x 451mm) Add 1? (4.5cm) for feet. Weig

12、ht. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 lbs/20 kg Refinements may be made on occasion to existing products without notice, but will always meet or exceed original specifications unless otherwise stated. TABLE OF CONTENTS SAFETY INFORMATION.2 GENERAL SPECIFICATIONS.3

13、DETAILED SPECIFICATIONS .4 CONTROLS AND THEIR FUNCTION .6 BU-150 CONNECTIONS.7 OPERATION .11 BU-150 TEST SET UP AND PROCEDURE.12 BU-150 POWER AMP MODULE TESTING FLOW CHART .13 BU-150 PACKING otherwise, the music will not sound natural. An experienced listener will set the volume of the subwoofer so

14、its impact on bass response is always there but is never obtrusive. The Crossover Frequency Controls 7. The Crossover Frequency control sets the high-frequency roll-off, adjustable from 50 to 150Hz.Where you set this control depends on the low-frequency capabilities of your satellite speakers, syste

15、m placement, and other factors affecting the mid-bass region.Turn the control UP (clockwise) until you feel there is too much mid-bass information (around 100Hz), then back the control down a bit until that area sounds more natural. To hear more low bass, turn the Crossover Frequency control DOWN a

16、bit and the Volume control UP by about the same amount.This will increase low bass while leaving the mid-bass sounding the same as it did before the adjustment.To reduce low bass without changing midbass, turn the Crossover Frequency control UP and the Volume control DOWN. Switch the Phase switch be

17、tween “NOM” and “REV” positions while listening to music.The selection that sounds the best is the correct adjustment for your system. Room Placement 8. The room placement of the subwoofer is the most critical aspect of its installation. It will be necessary for you to try various locations in your

18、listening room before you choose the final location.Some possible starting points include: behind the right channel satellite speaker, along the back wall between the satellites, along a side wall (but not too close to a corner), or behind a couch or a chair. In general, the closer the subwoofer is

19、to wall and corners, the greater the effect of low-frequency enhancement. Experiment with the Crossover Frequency and Volume controls in different locations until you are pleased with the result you obtain from your particular application. A Word of Advice The Low-Frequency Roll-off and Volume contr

20、ols may be set anywhere within their rotation. However, it will be a most unusual circumstance if you have to set the Volume control completely clockwise.This may indicate an unbalanced condition in your system (too much bass) or an especially large room, or room placement may not be correct.Try sev

21、eral other locations before concluding that the Volume control must be set at maximum. A Word About Tone Controls The tone controls on your electronic components (preamplifier, receiver, etc.) should be used with the utmost discretion.Excessive boost can create severe power demands on your power amp

22、lifier.Maximum bass boost can create a demand for literally hundreds of watts in the bass region, whereas in the “flat” position, or with the tone controls switched out of the system, your average listening level may be impressively and realistically loud at less than 10 watts.The remaining power ca

23、pacity required is on reserve for power peaks on sharp transients and powerful crescendos. 11 Amplifier/SubwooferBU-150 12 Amplifier/SubwooferBU-150 BU-150 TEST SET UP AND PROCEDURE TO REDUCE THE RISK OF ELECTRIC SHOCK. DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE CAUTION RISK OF ELECTRIC SHOCK

24、DO NOT OPEN 120V 60Hz 250W BU-150 DigitalTechnology Powered Subwoofer 180o0o Min 50 Max 150 Level Low Pass R RR L LL PowerPhase SPKR IN SPKR OUT Line Input OUTPUT FROM AMPLIFIER OUTPUT FROM AMPLIFIER FROM PRE AMPFROM PRE AMP AMPLIFIER CD PLAYER PRE AMP AC VOLT METER ( 6V )BU-150 UNDER TEST LINE LEVE

25、L SPEAKER LEVEL 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.Turn on generator, adjust to 50mV, 50 Hz. 3.Plug in UUT; red LED shou

26、ld be ON. Turn VOLUME control full clockwise. Low Pass control should be set fully clockwise (150) 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. 6.Connect one

27、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, immediate ba

28、ss 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 unusual noises are

29、 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 6.4 ohms. 3.Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by a signal generator and

30、 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. 13 Amplifier/SubwooferBU-150 BU-150 POWER AMP MODULE TESTING FLOW CHART No Yes No Yes No Yes No Yes No No Yes Yes H No Yes No Yes START Check V+, V-

31、, +/-15V voltage to module Check fuse transformer, CMC, rectifier, C1, C2 Check switching frequency 100KHz +/-10% 1Vpp Check I/P of module to GND 0V D.C. Power up with no signal I/P LED RED OK OK OK OK OK OK OK OK Check C29 and Pre-AMP Check O/P to module for 80Vpp square wave measure to GND Check L

32、1, L2, L3, L4, C6, C24 Check 6V to module measure to V- Replace Module Power AMP OK END Check D1, R1, Q3, Q4, Q5 and SCP Check transformer, CMC, rectifier, C1, C2, D9, D10, R16, R17 Check S/D voltage to module (5V) measure to V- Check D6, R9, R46 Resistance check between V+ V- and O/P O/P to GND sho

33、uld 5K 14 Amplifier/SubwooferBU-150 BU-150 PACKING alternately observe position of label on the top of the module; incorrectly replacing the Module 180 in the PCB slot will result in its destruction. All AC powered test instruments (meters, oscilloscopes, etc.) must have a floating ground, i.e. be c

34、onnected to an isolation transformer. Align and position the Amp Module before soldering. Attach the amp Module with the mounting screwsor powering up. Use only rosin-core or non-acid core solder; thoroughly de-flux the surfaces after soldering. If the new S53AMI/S64AMI Amp Module has larger mountin

35、g hole(s) in the case, and the stock screws no longer will fit, and screws of the proper type cannot be obtained locally order: (2) part# 60301S (screws) (2) part# 60301N (nuts) ? before soldering 1) 2) 3) 4) 5) 1 2 3 4 8 7 6 5 A B - - + + B OUTPUT AOUTPUT B -INPUT A-INPUT B +INPUT A+INPUT V- V+ 22 Amplifier/SubwooferBU-150 BU-150 SCHEMATIC 1 of 2 55 44 33 22 11 A A B B C C D D E E F F G G BU-150 Schematic 1 of 2 23 Amplifier/SubwooferBU-150 55 44 33 22 11 A A B B C C D D E E F F G G BU-150 Schematic 2 of 2 BU-150 SCHEMATIC 2 of 2