Scratchy noise from all surround mode except 3 channel
I have had this unit for quiet a while now. Before everything was working fine, but now the unit is not working properly. Here is the problem, when I play a movie or any cd selecting other surround mode, I'd get the scratchy noises and the unit will turn itself of. Only the 3 channel mode is working and I can only output the the two front speakers. I tried calling H/K tech for support but the unit warranty had expired a long time ago. Could it be the IC101 on the DSP board that were on the service bulletin board from H/K regarding the Logic 7 scratchy noise? Please help, I did not want to buy another receiver at this moment>
Re: Scratchy noise from all surround mode except 3...
I believe that these receivers needs approx. 100 Electrolytic capacitors that will fix all these kinds of problems. Mine had to go in the shop recently, the tech working on it is normally quite thourough, however he troubleshot to some ribbon flat cables that were defective and their slotted push in connectors going from the DSP board to the front processor. HK once pointed that a bunch of electrolytic capacitors have dried up, hence would need to be replaced. I would have done the work myself, however the unit had an extended warranty, in this case I will get an exchanged unit, perhaps a unit of my choice, but I still want a Harman Kardon.
The DSP processor is not always found to be faulty, however there is a change in the processor being used depending on your particular receiver's serial number.
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I've had this problem before, but not on this specific head unit. You most likely have your audio setup to 5.1 or other surround format, yet have nothing hooked up to the center channel output of the head unit.
Unless you've currently hooked up the center channel to an amplified speaker, or gotten out of a surround mode, you're not going to hear anything.
If you do have everything hooked up right and are sure the settings are correct, possibly a blown amp in the head unit.
There are a few things required for the rear surround channels to operate;
1. The surround back channels must be enabled in the surround setup menu.
2. The media being played through the receiver must have audio encoded for the rear surround channels. There are only a few exceptions to this but I'll exclude the explanation for simplicity.
3. The audio level of the speaker channels must be set high enough to be audible.
Enter the surround setup menu with your remote. Use the center button on the remote to toggle through the selections, press down on it to enter the selection. You will navigate to a selection in the surround setup menu that says "surround back" or S/B with a selectable yes or no indication. Press on the center button to enable them.
Media like DVD or Blu-ray that has 6.1 or 7.1 channel audio has separate, or often referred to as "discrete" or "matrixed" audio intended for playback through surround rear speakers, depending on the music or movie. If your media is encoded for 5.1, then there will be no audio sent to these speakers. However, with the different modes of on-board digital processing of this receiver you can still have audio through these speakers.
Last but not least is the actual playing level of these rear surround channels. They may simply be adjusted to quietly. Enter the setup menu with remote, choose "level" and navigate to the rear surround channels. You can adjust the level up or down in 1/2 dB level increments by toggling left or right with the center button. Each surround channel can and should be adjusted independently and equally.
There is likely separate gain controls for your surround channels on this receiver and they are probably set at -10dB. Enter the setup menu labled "level" and increase the amount for each channel equally.
Can I assume the calibration procedure also didn't work for the Front left channel? (It's not a "surround" if it's in the front). Switch the receiver to Stereo mode to eliminate any DSP actions. Tune an FM station to eliminate any external device or cable issues. What do you hear from the two Front speakers?
OK? Select a DSP surround mode. Check all modes. What happens?
If the channel goes dead using some or all DSP modes there's probably something wrong with the processor. If they all work...
Isolate the source that exhibits the problem.
It was a bad left channel cable somewhere, wasn't it?
Best thing to do is to put the unit in 5 channel or 7 channel mode. That will send left ch information to the front left and rear left speakers ( both will get the same information). Ditto with the right channel. The center channel will get centre channel information.
If all the speakers work, go out and rent TOP GUN. ( yes its old), BUT there are a few extreme scenes , one of which is the elevator scene, where the camera changes perspective and suddenly you hear the elevator doors close BEHIND you through only the surround speakers ( have the unit in surround mode....NOT 5 or 7 ch mode ). If this works ok, then you have no problems.
Remember, surround sound only produces information in the rear channels when the information is there. To check out the digital and DTS decoders, get an action flick. If you can, get a remote too, because that will unlock many features about the receiver that you cant get to with the front panel controls. Also go to yamaha and download the owners manual ( its free !!).....that should get you going.....