JBL Ms8 User Guide
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www.jbl.com Usi NG T he Ms-8 RESETTING THE MICROPROCESSOR If your MS-8 stops responding to the remote control (even after you’ve replaced the remote’s battery) or fails to operate in the way this manual describes, use a pen or similar pointed object to press the Reset button on the main unit (see Connections , on page 5.) NOTE: Pressing the Reset button will NOT erase your calibration settings. Need More Information? For more information, visit www.JBL.com for the latest technical information and other important MS-8 details. 41
www.jbl.com Tr OUBL eshOOT iNG If your MS-8 doesn’t seem to be working the way it should, read this section to see if the problem and possible solution are listed here. If, after you try all of the solutions listed here, the problem persists, contact JBL Customer Service at 516.255.4JBL (4525). POW er s OUN d The power LED does not illuminate. Symptom Symptom Possible Cause Possible Cause Solution Solution The power LED illuminates, but the display does not illuminate. There is no sound in all channels. Improper input connections. Calibration/setup procedure has not been performed. Incorrect input is selected on the MS-8 The MS-8’s System Volume is turned all the way down. Set the MS-8 System Volume at –20dB. See Acoustic Calibration , on page 32, and Volume Up and Volume Down Buttons , on page 35. Select the correct input using the MS-8’s Input Selection menu. See Input Selection Menu , on page 35. Perform the calibration/ setup procedure. (The procedure must be performed before the MS-8 will pass an audio signal through to its outputs.) See Calibration/Setup , on page 24. Confirm that all the required channels of the source unit are properly connected. See Audio Inputs , on page 7. The +12V, Gnd or Rem In terminals are not properly connected. The fuse is blown. The display is not properly connected. The MS-8’s microprocessor needs to be reset. Replace the fuse with an identical 25A fuse. Check the connections at display and at main unit. See Connections: Display , on page 14. Press Reset button with a pen or similar object. See Resetting the Microprocessor , on page 41. Confirm that all power connections are correctly made according to this manual. See Connections: Power , on page 5. The head-unit or source-unit volume control is turned all the way down. Turn the head-unit or source unit volume up to a normal level. 42
www.jbl.com Tr OUBL eshOOT iNG s OUN d Symptom Possible Cause Solution There is no sound in one or more channels. The sound comes from the incorrect speaker. Sound comes from only the left or right side speakers; or sound comes from only the front or rear speakers. The Balance and/or Fader controls are set all one way or another. Use the MS-8’s System Levels screen to set the controls to their center positions. See Audio Controls Menu , on page 35. Incorrect output connection. Incorrect channel assignment. Perform the Input Setup (page 25) and Output Setup (page 26) procedures again. (See the If you make a mistake sidebar, on page 27.) Before beginning the procedures, make sure to confirm and document which speakers are connected to which MS-8 Confirm that the speaker is connected to the correct MS-8 speaker output or to the correct outboard- amplifier channel. Improper input connection. Improper output connection. Improper speaker connection to outboard amplifier. Outboard amplifier channel is not functioning. Troubleshoot the outboard amplifier and replace it, if necessary. Confirm that the speaker is properly connected to the outboard amplifier. Confirm that the speaker in question is properly connected to the MS-8’s speaker output. See Audio Outputs , on page 10. If the speaker is connected to an outboard amplifier, confirm that the outboard- amplifier channel is properly connected to the MS-8. See Audio Outputs , on page 10. Confirm that all required channels of the source unit are properly connected. See Audio Inputs , on page 7. 43
www.jbl.com sOUN d The Aux input level is not properly set. The source player’s volume control is set too low. Set the source player’s volume control to a higher level. The source connected to the Aux input is too quiet or too loud. The sound in all speakers is distorted. The MS-8’s System Volume control and the head unit’s volume control are not properly adjusted. The MS-8’s Bass Control and/ or Graphic EQ bass bands are set with too much boost, combined with a high System Volume setting. Reduce the Bass Control and/or Graphic EQ boost levels. We recommend never combining high levels of Graphic EQ bass-band boost with high Bass Control boost. If you have connected the front speakers to be driven directly by the MS-8’s internal amplifier, set the MS-8’s System Volume at –20dB. If you have connected the front speakers to an external, higher-powered amplifier that is connected to the MS-8’s line outputs, set the MS-8’s System Volume to a level lower than –20dB. In either case, you should use the head unit’s volume control to control the system’s volume. You may need to make a minor adjustment to the MS-8’s System Volume setting to allow you to use more of the range in the head unit's volume control. If you hear distortion when the head unit’s volume control is at higher settings, increase the MS-8’s System Volume to compensate. This change will let you keep the head unit’s volume control within a lower (more distortion-free) portion of its range. Use the MS-8’s System Levels screen to set the Aux level so that the Aux source’s level matches the level of the head unit source. See Audio Controls Menu , on page 35. Tr OUBL eshOOT iNG Symptom Possible Cause Solution 44
www.jbl.com Tr OUBL eshOOT iNG s OUN d The MS-8’s Logic 7 processing is (by design) sending all mono information to the center speaker. The center speaker seems too loud when you’re listening to news, sports or talk radio stations. The sound always has too much or too little bass or treble. Music is dull, lifeless and confined-sounding, with poor stereo imaging. The MS-8’s Logic 7 and digital signal processing (DSP) are defeated. The MS-8’s System Volume was set at too high a level during the acoustic-calibration process. Perform the acoustic- measurement portion of the calibration/setup process again, with the MS-8’s System Volume set at –20dB. See Acoustic Calibration , on page 32. Use the MS-8’s Audio Controls menu to activate Logic 7 and DSP. See , on page 36. The MS-8’s Tone Controls and/or Graphic EQ are mis- adjusted. Use the MS-8’s Tone Controls and/or Graphic EQ screens to return all controls to their center positions. See Audio Controls Menu , on page 36. Use the MS-8’s System Levels screen to reduce the center speaker’s level until it sounds correct to you. Then save the settings as one of the MS-8’s Favorite settings so you can recall it whenever you listen to this type of station. See Audio Controls Menu , on page 36, and Favorites Menu , on page 39. Symptom Possible Cause Solution 45
www.jbl.com errOr M ess AGes ON disPLAY There is insufficient cooling air around the main unit. “MS-8 Has Overheated…” “No DSP Response…” “Voltage Too High…” or “Voltage Too Low…” The vehicle’s electrical system may be malfunctioning. If the message displays only once and the MS-8 resets without incident, no further involvement is necessary. If the message displays often, contact your vehicle’s dealer or mechanic. There has been a possible electrostatic discharge within the main unit. If the message displays only once and the MS-8 resets without incident, no further involvement is necessary. If the message displays often, contact JBL Technical Support at 516.255.4JBL (4525).Re-install the main unit in a less confined area that will allow cooling air to circulate around the unit. See Choosing a Location for the Main Unit , on page 17. Tr OUBL eshOOT iNG M is CeLLAN eOU s The display is hard to read. The Brightness and/or Contrast controls are not properly adjusted. Use the MS-8’s Brightness and Contrast screens to adjust the display for better viewing. See System Settings Menu , on page 40. Symptom Symptom Possible Cause Possible Cause Solution Solution 46
www.jbl.com sP eC iF iCAT iON s Power Output: 20W x 8 channels @ 4 ohms Maximum Output Power: 30W x 8 channels @ 2 ohms Frequency Response: 20Hz–20kHz Signal-to-Noise Ratio (Line Input to Line Output): >90dB Signal-to-Noise Ratio (Line Input to Speaker Output): >85dB Maximum Input Voltage (Speaker-Level Input): 15V Maximum Input Voltage (Line Input): 2.8V Maximum Output Voltage (Line Output): 2.8V Maximum Current Draw: 16A Standby Current Draw:
www.jbl.com © 2010 Harman International Industries, Incorporated. All rights reserved. JBL and Logic 7 are trademarks of Harman International Industries, Incorporated, registered in the United States and/or other countries. Dolby and Pro Logic are registered trademarks of Dolby Laboratories. iPod is a trademark of Apple Inc., registered in the U.S. and other countries. iPod is not included. Velcro is a registered trademark of Velcro Industries B.V. Features, specifications and appearance are subject to change without notice. www.jbl.com Harman Consumer, Inc. 8500 Balboa Boulevard Northridge, CA 91329 USA 48