Infinity-HTS20revJ-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 J 5/2003 BU-120/HTS-20 Powered Subwoofer SERVICEMANUAL 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 volt

2、ages and 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

3、 have 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

4、plugged 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 SafetyComponents Requiring ExactReplacements F1Fuse SLO BLO 1.0A 250V 20mm. UL approved PWRCORDSPT-2 or better with polarized plug, UL approved

5、 wired with the hot side to fused side. Use with factory replacement panel strain relief only. T1Transformer. Use only factory replacement. DBR or D1Bridge diode. Use only factory replacement. C1, 24700uF, 50V electrolytic filter caps. Be sure replacement part is at least the same working voltage an

6、d capacitance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration. C610uF 50V electrolytic radial* BU120 and HTS-20 rev. A only. S53AMI or CN1Power output module. Use only factory replacement FaceplateFaceplate. Use

7、 only factory replacement Air leak coverUse only factory replacement CMC1Use only factory replacement L1Use only factory replacement Fuse PCBUse only factory replacement Main PCBUse only factory replacement R29470 .25W METAL OXIDE, non flammable Leakage/Resistance Check Before returning the unit to

8、the customer, perform a leakage or resistance test as follows: Leakage Current. Note 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

9、 and chassis ground of the unit under test. if leakage current exceeds 0.5mA, the unit 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!

10、 DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected. 2 Amplifier/SubwooferBU-120/HTS-20 *See Service Bulletin (INF2000-01 REV 2) page 15. IMPORTANT SERVICE NOTES: When testing the BU120/HTS-20 Series amplifier, a load must always be conne

11、cted to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load. All AC powered test instruments (meters, oscilloscopes, etc.) must have a floating ground, i.e. be connected to an isolation transformer. RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS SAFETY INFORMATION.2 GENERAL SPECIFICA

12、TIONS.3 DETAILED SPECIFICATIONS .4 CONTROLS AND THEIR FUNCTION .6 BU-120/HTS-20 CONNECTIONS.7 OPERATION .11 BU-120/HTS-20 TEST SET UP PROCEDURE .12 BU-120/HTS-20 AMP MODULE FLOW CHART .13 SERVICE BULLETIN INF9902 Rev 1 .14 SERVICE BULLETIN INF2000-01 Rev 2 .15 TECH TIP INFTT2000-01.16 TECH TIP INFTT

13、2001-03.17 TECH TIP INFTT2003-01.18 PACKING this places the preset roll-off crossover frequency point at 100Hz. BU-120 OPERATION Setting the Controls Turn the Power On 4. Turn on the entireaudio system and play any music source. 5. Turn the Volume control to its mid position. If no sound emanates fr

14、om the subwoofer, check the AC line cord and input cables. Are the connectors on the cables making proper contact? Is the AC plug connected to a “live” receptacle? Adjustingthe Volume 6. Set the overall volume control of the preamplifier or stereo to a comfortable level. Adjust the subwoofers Volume

15、 control until you obtain a pleasing blend of bass.Bass response should not overpower the room but rather be adjusted so there is a harmonious blend across the entire musical range. Many users have a tendency to set the subwoofer volume too loud following the belief that a subwoofer is there to prod

16、uce lots of bass. This is not entirely true. A subwoofer it there to enhance bass, extending the response of the entire system so the bass can be felt as well as heard. However, overall balance must be maintained; otherwise, the music will not sound natural. An experienced listener will set the volu

17、me of the subwoofer so its impact on bass response is always there but is never obtrusive. The Crossover Frequency Controls (BU120 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

18、your satellite speakers, system 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 Cross

19、over Frequency control DOWN a 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 DO

20、WN. Switch the Phase switch between “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

21、try various locations in your 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

22、, the closer the subwoofer is 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-Frequ

23、ency Roll-off and Volume controls 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 placem

24、ent may not be correct.Try several 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 p

25、ower demands on your power amplifier.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 1

26、0 watts.The remaining power capacity required is on reserve for power peaks on sharp transients and powerful crescendos. 11 Amplifier/SubwooferBU-120/HTS-20 1. Initially set the subwoofers Volume control to the minimum position. 2. BU120 - Initially set the subwoofers Crossover Frequency control to

27、12 oclock. HTS-20 - If you are using a receiver or surround processor containing a Dolby Digital and/or DTS decoder, set the crossover bypass switch to On. If you are using a stereo or Dolby Pro logic receiver, set this switch to Off; this places the preset roll-off crossover frequency point at 100H

28、z. 3. Set the subwoofers Phase switch to the 0 position. only) NOTE: When testing the BU120/HTS-20 amplifier, a load must always be connected to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load. 13 Amplifier/SubwooferBU-120/HTS-20 BU-120/HTS-20 POWER AMP MODULE TESTING FLOW C

29、HART (HTS-20 rev. A only) Infinity Systems, Inc.250 Crossways Park Dr.Woodbury, New York 11797 (516) 496-3400 Service Bulletin Service Bulletin INF9902 Rev1 - February 2001This is considered a Minor repair To:All Infinity Service Centers Models: BU-80, BU-120, BU150, HTS-10, HTS-20 Subject:Check Sol

30、der Joints in Event of Failure Some performance related complaints in the BU Series powered Subwoofers may be caused by cold solder connections between the 28 pins of the Power Amp Module and the main circuit board. When troubleshooting, failure to check these joints can result in erroneous conclusi

31、ons or wasted time. In the event you receive a Subwoofer with the complaints “Dead, or No Output, or Motorboating (Oscillation)”, perform the steps listed below first before any further troubleshooting takes place: 1) Unplug all cables, lay the subwoofer on a padded surface. 2) Remove all Philips sc

32、rews around the outer perimeter of the amplifier faceplate. 3) Remove amplifier assembly; you should be able to remove the amplifier far enough out of the cabinet to service it without removing the woofer wires. 4) Locate the Power Amp Module; it is the large gray component with a metal case. On the

33、 solder side of the circuit board are the 28 soldered connections to the Module. 5) Regardless of whether you can visibly see breaks in any of the connections or not, carefully re-solder all 28 pin connections, adding 60/40 rosin core solder. Take care not “bridge” any connections on the board with

34、solder. 6) Inspect the solder joints to the main filter capacitors C1 and C2 on the main PCB and re-solder if needed. 7) Replace the amplifier assembly back into the cabinet; replace the screws. 8) Test the unit by applying a signal from a music source, adjust the volume to a moderate level and conf

35、irm the original problem has been corrected. IMPORTANT SERVICE NOTES: When testing the BU or HTS Series amplifier, a load must always be connected to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load. All AC powered test instruments (meters, oscilloscopes, etc.) must have a fl

36、oating ground, i.e. be connected to an isolation transformer. 14 Infinity Systems Inc.250 Crossways Park Dr.Woodbury, New York 11797 (516) 553-3332 Service Bulletin Service Bulletin INF2000-01 Rev2 - February 2001Warranty labor rate: MINOR repair To:All Infinity Service Centers Models: BU80, BU120,

37、HTS-10 revA, HTS-20 revA subwoofers Subject: Failure of C6 In the event you receive a BU80, BU120, HTS-10 or HTS-20 subwoofer with the complaint “no output” and capacitor C6 (10uf 50v NPE) is damaged in the amplifier: Order kit Infinity part# 30722 and replace the following included parts: C6 (10uf

38、100v NPE cap)C24 (100nF 50v cap)R46 (471/4W resistor) R23 (20k1/2W resistor used only on models BU120, HTS-20 revA) BU80/HTS-10BU120/HTS-20 General reference for location only; not all parts or designators may conform to these drawings. FOLLOWING THE REPAIR: Follow instructions included in bulletin

39、#INF9902. IMPORTANT SERVICE NOTES: When testing the BU or HTS Series amplifier, a load must always be connected to the output terminals, whether the woofer, or a 4 to 8 ohm resistive load. All AC powered test instruments (meters, oscilloscopes, etc.) must have a floating ground, i.e. be connected to

40、 an isolation transformer. ModelsSerial number 120/230VStatusAction BU80 BU120 HTS-10 revA HTS-20 revA All serial numbers affected Replace if damaged Replace C6,R23, C24, R46 with Infinity part# 30722 15 TECH TIPS Troubleshooting tips and solutions to common service problems For models: BU-120/HTS-2

41、0 TIP# INFTT2000-01 Complaint: How do you replace or service any of the front panel components on the Subwoofer faceplate for model BU-120/HTS-20. Probable Cause: The High level Input terminals, potentiometers, RCA jack, and switch(es) are behind a sealed cover to protect the air-tight integrity of

42、the cabinet enclosure. Solution: 1) Unplug all external cables from the subwoofer; place the cabinet on a padded surface. 2) Remove any subwoofer grille; remove the woofer from the cabinet. Detach the two connections from the woofer terminals. 3) Remove all Phillips screws holding the amplifier to t

43、he cabinet; remove the amplifier. 4) Remove all knobs, nuts, and Philips screws from the outer control section of the amplifier faceplate. 5) Locate the sealed cover on the inside of the amplifier faceplate (see illustration); the bead of adherent must be broken to remove the main PCB with front pan

44、el components from the plastic faceplate. This is most easily accomplished by CAREFULLY using a box cutter, exacto knife, or similar sharp instrument. First scrape all excess material from the three surfaces; then force the blade into the groove between the rear cover and the faceplate. DO NOT attem

45、pt to remove the rear cover from the main PCB. 6) When enough material is removed, the main PCB with cover should pull away from the faceplate, exposing the components. 7) After servicing a bead of “silicon seal” or similar adherent must be applied to all surfaces where it was removed. Reassemble th

46、e rest of the components in reverse order. 16 Amplifier/SubwooferBU-120/HTS-20 17 TECH TIPS Troubleshooting tips and solutions to common service problems For models: HTS-10,* HTS-20,* BU80E (See Note below) TIP# INFTT2001-03 Subject: Disassembly instructions for power amp module CN1/CN101: Synopsis:

47、 The entire heatsink/shield assembly on the power amp module is attached with two screws, and will slide off the PCB, exposing the components. Instructions: 1) Unplug all external cables from the subwoofer; place the cabinet on a padded surface. 2) Remove all Phillips screws holding the amplifier to

48、 the cabinet; remove the amplifier. 3) Detach the plug connecting the amplifier to the woofer. 4) Remove the two large Phillips screws, with nuts remove the shield. 5) At the bottom of the main PCB locate the two Phillips screws holding the heatsink/shield assembly to the main PCB; remove them. 6) If required, with the addition of a screwdriver blade or similar tool, carefully pry the heatsink away from the main PCB, working both sides evenly. Pull it straight off the PCB (its in a slot in the heatsink). Replacement: Fo