Question about Harman Kardon Harman HK 990 Amplifier
I have a Harman Kardon HK990 which throws an error #005 if I switch it on with a digital input connected. If digital input is not connected, it turns on without any error and all buttons work as expected - like switching inputs, speaker settings etc. But there is no sound for any inputs including processor bypass in direct mode. I have read about an IC SRC 4392 as a potential problem. If that is indeed the case, what is the solution? Just buying a new SRC 4392 and replacing the existing one will solve the problem? Can someone help me with instructions?
If you had a bad amplifier, as suggested, the unit would most likely have a condition known as DC Offset. In this case, the amp would immediately shut off. As you said, the amp stays on, but you have no sound. First thing I suggest, turn the unit off. Listen carefully to the top of the amp. When you first push the power button, you should immediately hear one click, followed by a second click, within 5-20 seconds. If you hear that second click, you amp is likely not bad. If you don't, then you do most likely have a blown amp, with engages the DC Protection circuit to the microprocessor(computer within your unit).
Next step is to open your owner's manual. In there, you will find a procedure called, "Return to factory reset, or default". Follow that procedure, to reset the unit back to the factory settings. Those inputs are assignable, meaning that you can make certain inputs, analog or digital. You may have set one wrong by mistake. The reset will fix that. If you need more assistance, or would like to inquire about a repair, please visit my website at, Audioserviceclinic.com. By the way, I worked for HK, JBL and Infinity. Thank you.
Posted on Nov 29, 2014
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Posted on Jan 02, 2017
You have a bad amplifier section and your unit will need to be repaired by a technician. I would disconnect the speakers to prevent possible damage. In some cases components in line with the transistors will be bad in the amplifier also. There is no way to tell without electrically testing the unit in shop. Estimated repair cost would be in the 60 to 80 dollar range depending on the number of parts that are bad and the labor rate in your area.
Posted on May 04, 2010
check to make sure you dont have a bad hdmi cable thats what it sounds like is stereo balance set to the middle on the receiver.
Posted on Aug 20, 2010
Testimonial: "Thank you, you were right on the money with your answer and help!"
The problem is in the audio circuitry, there are bad solder joints on the board that need to be addressed, from your description it is a intermittent issue with the sound. Since this a high end unit I recommend a top audio technician to work on your amplifier, and I suggest not using the system until it is repaired because the risk to the audio output parts getting damaged is high and they are pricey.
Posted on Jan 07, 2011
Sabve your money - it's BUY-wiring.
Bi-wiring does nothing but make you use twice as much speaker wire for the same electrical effect. Bi-amping assumes there are deficiencies in your electronics that must be worked around, again by using more speaker wire and separate amps.
Do some reading on the web about "bi-wiring".
Posted on Jul 16, 2011
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IMPORTANT: When connecting two pairs of speakers, determine the impedance of each pair
by looking on the back of the speakers, in your owner's manual, or by contacting your dealer or manufacturer.
You can listen to two pairs of speakers at the same time ONLY if the impedance of EACH speaker is NOT LESS THAN 8 Ohms.
WARNING: Do not play sets of speakers simultaneously except as recommended above.
Amplifier may overheat.
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