Harman Kardon HK 990 Owners Manual - Page 15

HK 990 Troubleshooting Troubleshooting This unit is designed for trouble-free operation. Most problems users encounter are due to operating errors. So if you have a problem, first check this list for a possible solution. If the problem persists, consult your authorized ­Harman Kardon service center. If the problem is... Make sure that... No lights illuminate when power cord is plugged into AC outlet. No sound is heard. Sound is not heard from the speaker system on one side. When listening to stereo sound, the left and right sounds are reversed. Intermittent or continuous buzzing or hissing. The remote control and front panel controls don't appear to work. Humming noise when listening to LP. Howl or ringing when listening to LP. Low sound level when listening to LP. LP sound is distorted and too loud. You can find additional troubleshooting information in the FAQs link on the Support page at www.harmankardon.com. •• The unit is plugged into a live outlet. •• Speaker switches corresponding to the desired speakers are pressed. •• Correct source button has been pressed. •• Volume is turned up. •• Speaker wires are connected properly. •• Hookup wires to source component are connected properly. •• The speaker wires and connection wires are connected correctly. •• The balance setting is at 0. •• The speaker wires are connected correctly. •• The wires between components are connected correctly. •• The unit is away from fluorescent lights, TV, motors and other electrical appliances. •• You try disconnecting the AC line cord from the wall socket, waiting five minutes and then reconnecting it. •• Ground wire from record player has been connected to ground terminal on amplifier. •• Cable from record player is away from power cords and speaker cables. •• Record player is not too close to speakers. •• Record player is on stable surface. •• Cable from record player is connected to the Phono jacks. •• The MM Input has not inadvertently been used with an MC phono cartridge. •• The MC Input has not inadvertently been used with an MM or MC High Output cartridge. 15