Infinity-BasslinkII-sub-sm 维修电路原理图.pdf

BassLink II Powered Automotive Subwoofer SERVICE MANUAL Infinity Systems, Inc. 250 Crossways Park Dr. Woodbury, New York 11797 Rev0 8/2005 RadioFans.CN 收音机爱 好者资料库- CONTENTS - SPECIFICATIONS .1 PACKAGING.2 CONNECTIONS/APPLICATIONS.3 CONTROLS AND FUNCTIONS.6 BASIC TROUBLESHOOTING.8 DISASSEMBLY PROCEDURE.9 EXPLODED VIEW.10 AMPLIFIER BLOCK DIAGRAM11 ELECTRICAL PARTS LIST . 12 P.C.B. DRAWINGS.18 IC/TRANSISTOR PINOUTS. 30 SCHEMATICS.31 Basslink II Specifications Output Power (14.4V supply) 250W RMS 1% THD Type of Amplifier AB Frequency response: 20Hz 120Hz Maximum input signal: 4.0V Maximum sensitivity: 50mV to 4V Line-level input 1V to 16V High-level input Input Impedance 20K Idle Current 100dB (A-weighted ref to full power) Crossover Type Fixed LP 12dB per octave Crossover Range Variable 50 120 Hz Bass EQ 40Hz (-6dB to +3dB) Phase Control 0 and 180 Min Current Draw (Idle) 800mA Remote Current Draw 3.5mA Max Current Draw 26A DC Offset 30mV Bass Boost -6dB to +3dB 40Hz Auto Turn-On 2 -10min (Time to turn Off) Operating Voltage 10 16 VDC Overall Dimensions (L x W x H): 15-1/16 x 8-3/4 x 15-5/16 (383mm x 223mm x 389mm) Sub Level Control (w/ housing): 2-3/16 x 2-5/16 x 7/8 (56mm x 59mm x 23mm) Sub Level Control (w/o housing): 2-3/16 x 1-5/16 x 3/4 (56mm x 34mm x 20mm) Fuse: 25A Infinity 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. Powered SubwooferPowered Subwoofer Basslink IIBasslink II RadioFans.CN 收音机爱 好者资料库Powered SubwooferPowered Subwoofer Basslink IIBasslink II 2Make Power, Ground and Remote turn-on connections as shown in Figure 5. Observe the following installation tips:Use #8 AWG wire for the +BATT (+12Vdc) and GND (ground) connections. If needed, useat least a #20 AWG wire for the REM (remote)connection.If you pass the power or remote wire through the vehicles firewall or other metalobstruction, it must be insulated with a rubbergrommet. If a factory-installed grommet isunavailable, be sure to install a rubber grommet to protect the wires.Connect a short GND wire from BassLink II tothe nearest bare metal surface. For a good connection, sand away paint from the metal surface and use a screw with a (star) lock washer.Figure 5. Power connections for BassLink II.Install a fuse holder with a 25A fuse within 18of the battery + terminal (see Figure 5).The REM connection requires +5 to +12 Vdc for BassLink II to turn on remotely. Most headunits with preamp outputs provide this remotevoltage signal. For speaker-level applications, a remote connection is not required, sinceBassLink IIs AutoTurn On feature will sensevoltage on the speaker wires to automaticallyturn on BassLink II.IMPORTANT: To enable BassLink IIs Auto Turn On feature, set AUTO TURN ON to theAUTO position (see Figure 15 on page 6). POWERCONNECTIONSBassLink II is equipped with four line-level (RCA)inputs and four speaker-level inputs. Any combina-tion of line-level and speaker-level inputs may beused to provide nonfading bass when connected toa head unit with four outputs.Figure 6. BassLink II audio connections for a headunit with two line-level or subwoofer (RCA) outputs.To help you plan your installation, we haveincluded three system applications in Figures 6through 8. For more system ideas, see yourauthorized Infinity car audio dealer.Note: The applications show the REMOTE LEVELcontrol, which installs under the dashboard foreasy in-car bass level adjustments (see page 7).APPLICATIONSPowered SubwooferPowered Subwoofer Basslink IIBasslink II 3Figure 7. BassLink II audio connections for a headunit equipped with four line-level (RCA) outputs. APPLICATIONS(CONTINUED)Figure 8. BassLink II audio connections for a headunit equipped with four speaker-level outputs.LF Speaker+?RF SpeakerLR SpeakerRR Speaker+?+?+?Source UnitBassLink II?(right side)+?RCA Stereo Cables?(not supplied)BassLink II?(right side)Powered SubwooferPowered Subwoofer Basslink IIBasslink II 4DESCRIPTIONThe BassLink 4sc is a plug-and-play amplifierdesigned to make upgrading your system easy.The BassLink 4sc is designed to slide into anavailable slot in the BassLink II. Unlike an additional outboard amplifier, the BassLink 4scdoesnt require any additional space. TheBassLink 4sc also includes a Phantom Centereffect, which creates the illusion of a centerchannel even if no center speaker is installed.INSTALLATION1. Remove the wiring cover from BassLink II. 2. Remove the eight screws that hold theAMPLIFIER DOCK cover panel in place (Figure 9). Save the screws. 3. Remove the screw that attaches the twowiring harnesses and connectors to the panel. 4. Connect the wiring harness connectors to theappropriate connectors on the BassLink 4scscircuit board. See Figure 10. 5. Insert the amplifier and install the eightscrews that were removed in Step 2. SeeFigure 10.6. Install 40A fuse at the battery.Note: All four inputs on BassLink II must be usedin order for the BassLink 4sc amplifier to functionproperly.Figure 9. Figure 10. BASSLINK4SCINSTALLATIONCONNECTIONSConnect the front and rear speakers as shown inFigure 11.Figure 11. SETTINGSThe BassLink 4sc has input level control for thefront and rear speakers and PHANTOM CENTERcontrols.For proper setup, please refer to the full BassLink 4sc owners manual.Figure 12. APPLICATIONFigure 13. Typical installation using all four speaker-level inputs from the source unit.LeftFrontRightLeftRearRight+?+LeftFrontRightLeftRearRight+?+BassLink II?(right side)LF+?RF?+LR+?RR?+Powered SubwooferPowered Subwoofer Basslink IIBasslink II 56BassLink II provides several controls and indica-tors that simplify sonic integration with virtuallyany vehicles unique acoustic properties. They arelocated on the front and side panels, as shown inFigures 14 and 15.Figure 14. BassLink II controls on the front panel. POWER LED:This indicator will glow blue whenBassLink II is operational.GAIN Control: Use this control to adjust the rela-tive volume (loudness) of BassLink II with respectto the other speakers in the vehicle.CROSSOVER: Use this control to adjust theamount of high-frequency information present inBassLink IIs output. A lower value means more ofthe high frequencies are filtered out. BASS BOOST: Use this control to correct any perceived peak or dip in the bass response (typically around 40Hz in most vehicles). Set thecontrol to any value between 6dB and +3dB,according to what sounds best.Figure 15. BassLink II controls on right-side panel. PHASE Control: Use this switch to reverse thephase of BassLink IIs output with respect to its input. Choose the position (0 or 180) thatsounds the best.Note: Depending on BassLink IIs orientation andlocation in a vehicle, reversing the phase may, or may not, increase or decrease the amount of upper bass being reproduced. AUTO TURN ON: For speaker-level connections,use this switch to activate (or deactivate) BassLinkIIs automatic turn-on circuit. For most speaker-levelapplications, slide the switch to AUTO. However, ifyour system produces false turn-on signals or usesa remote (REM) connection, slide the switch to OFF . REMOTE LEVEL Control: Use this RJ11 jack to connect the REMOTE LEVEL control (see page 7).SERVO LED:This indicator glows blue when thesubwoofer is at maximum excursion and theamplifier is modifying the output to maintainmaximum performance. Be sure to monitor thisindicator during BassLink II setup (see TuningBassLink II). When properly tuned, the SERVO LEDshould light momentarily during high-level basstransients. Avoid adjustments that cause the LEDto remain lit for extended periods.CONTROLS ANDFUNCTIONS1. Unplug the RJ11 cable that connects theREMOTE LEVEL control to BassLink II. 2. Make sure the head unit is off and its volumecontrol is set to minimum. 3. On BassLink IIs front panel, initially set all controls to their midpoint positions, asshown in Figure 14. On BassLink IIs sidepanel, initially set PHASE to 0 , as shown in Figure 15.4. Turn on the head unit and play a favoritemusic track that has substantial bass. Set thehead units volume control to 75 percent ofthe total output (approximately 3 oclock onrotary controls). 5. Adjust the GAIN control clockwise until theSERVO LED (on BassLink IIs side panel)begins to flash with each bass note but doesnt stay lit continuously.6. Listen to your system, making a mental note of the amount of upper bass being reproduced.7. Switch the PHASE control to 180 and listenagain for upper bass content. There may bemore upper bass, less upper bass, or nochange at all. The position that provides themost upper bass is correct, but choose eithersetting according to your taste.8. Adjust the CROSSOVER control clockwise or counterclockwise until you hear only low-frequency information. For example, youshould NOT hear any vocals coming fromBassLink II when seated in the normal listen-ing position. 9. Adjust the BASS BOOST control clockwise orcounterclockwise to suit your taste. 10. Recheck the SERVO LED to make sure its flashing in time with the bass but is not lit continuously. If it is lit continuously, adjust the GAIN control counterclockwise until theSERVO LED only flashes in time with the bass.11. Reconnect the RJ11 cable between theREMOTE LEVEL control and BassLink II. Youmay then use the REMOTE LEVEL control toadjust the level of the bass to suit your tasteand/or different program material.Note: In most cases, the above steps will providesatisfactory tuning. However, the actual processmay require several readjustments of each control,since the settings will interact with each other. If necessary, consult your authorized Infinity car audio dealer for help in tuning your system.TUNINGBASSLINKIIPowered SubwooferPowered Subwoofer Basslink IIBasslink II 6The REMOTE LEVEL control is used to adjust theoutput level of the subwoofer. This level controlallows you to reduce the subwoofer output formusic with heavy bass content and increase thelevel for music with less bass content. PHANTOM CENTER Switch:The REMOTE LEVELcontrol has a three-position switch that is usedwhen the BassLink 4sc amplifier is installed.Please refer to the BassLink 4sc owners manual for the specific operation of this switch.INSTALLATIONOPERATIONCONNECTING THEREMOTE LEVELCONTROL TOBASSLINKIIThe REMOTE LEVEL control may be mountedunder the dash or may be dismantled and mounted in the dash for a factory appearance.UNDER-DASH MOUNTING Select a mounting location that allows easyaccess to the control while driving. Using theREMOTE LEVEL control as a template, mark anddrill holes in the mounting surface. Attach theREMOTE LEVEL control using the mountingscrews provided (Figure 16). Figure 16. Under-dash mounting of the REMOTELEVEL control. Route the cable behind the dash or other interiorpanels and under the carpet. Do not route the cable outside the vehicle. Connect the RJ11 cablebetween the RJ11 receptacle on the BassLink II and the receptacle on the REMOTE LEVEL control(Figure 17). Figure 17. REMOTE LEVEL control electrical connection.Powered SubwooferPowered Subwoofer Basslink IIBasslink II 7BassLink II (4sc, if installed)PROBLEM: POWER LED not lit. CAUSES and SOLUTIONS:1. Fuse is blown and needs replacement.2. Head unit not functioning properly. Checkremote voltage, and power, ground orremote connections.PROBLEM: POWER LED is lit but there is no bass.CAUSES and SOLUTIONS:1. Inputs are not connected. Check connections.2. Head-unit fader control is not set properly.Adjust head-unit fader control to feed audiosignals to BassLink II.PROBLEM: BassLink II sounds muddy or distorted.CAUSES and SOLUTIONS:1. Gain is set too high and SERVO LED is lit constantly. Readjust GAIN control (seeTuning BassLink II on page 6). 2. Bass is set too high. Readjust BASS BOOSTcontrol (see Tuning BassLink II on page 6).3. Head-unit output is distorted or blown. Seeyour authorized Infinity car audio dealer.PROBLEM: No output from BassLink II when head-unit fader control set to front or rear (in a 4-channel connection).CAUSE and SOLUTION:Input connections are improperly wired. Verifyall connections (see Applications starting onpage 3).PROBLEM: BassLink II turns on before head unit is com-pletely on and produces a “thump” sound.CAUSE and SOLUTION:For speaker-level connections, head unit is producing a false turn-on signal. On BassLinkIIs side panel, slide AUTOTURN ON to OFF . PROBLEM: BassLink IIs POWER LED remains on after headunit is turned off.CAUSE and SOLUTION:For speaker-level connections, this is normaloperation when AUTOTURN ON is set to ON.BassLink II will remain on another 5 to 10 min-utes after sensing that audio signals are notpresent before shutting down.PROBLEM: BassLink II produces a loud humming noisewith the system OFF when using speaker-levelinputs. CAUSE and SOLUTIONS:This problem is caused by a feedback loopbetween your speakers and the high-level inputsof BassLink II. Choose one of the following solutions:1. Connect a wire from the REMOTE terminal onBassLink II to the remote turn-on of your headunit or to the vehicles accessory circuit. On thecontrol panel, slide the AUTOTURN ON switchto the OFF position.2. Connect the supplied capacitors between each of the speaker outputs of the head unitand the speakers positive lead, as shown in Figure 18. Connect each positive lead ofBassLink IIs high-level inputs to the head-unitside of the capacitors. Use one capacitor perspeaker input channel.Figure 18. Connecting supplied capacitors. TROUBLESHOOTINGCapacitor+ Speaker wire ?from head unitTo + speaker-level?input on BassLink IITo + speaker leadPowered SubwooferPowered Subwoofer Basslink IIBasslink II 8 BASSLINK II DISASSEMBLY 1) Remove “Amplifier Dock” cover; (8) Phillips screws. 2) Remove (10) Phillips screws holding main heatsink/amplifier to enclosure, tapping the heatsink with a rubber mallet may be necessary to loosen it. Pull amplifier from enclosure 3) Remove single 12 pin Molex connector M300 and both pairs of FASTON terminals from the amplifier PCB; do not mix up the two pairs of red/black wires (speaker and A/B). Label if necessary. 4) With the screw cavities facing upwards on the enclosure, remove the (12) Phillips screws holding the enclosure together. 5) Using the opening of the “Amplifier Dock” as leverage, separate the enclosure halves; to completely separate the wiring, remove the 8 pin Molex connector M200 from the Jack/Limiter PCB. 6) If the Gain PCB (Gain/Xover/Base pots) needs to be accessed, there is an additional screw holding the plastic cover on, besides the two exposed ones, that must be removed and is visible after removing the 10 passive radiator (8 Phillips screws) 7) The Jack PCB is not serviceable, as it is attached to the enclosure with adhesive. 8) Reassembly: follow in reverse order, and be sure to not mix the red/black wire pair (speaker and A/B) on the MAIN PCB when you connect them to the FASTON terminals. 9Powered SubwooferPowered Subwoofer Basslink IIBasslink II EXP