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When all hooked up properly, I have no audio coming out of the speakers, can only hear a buzzing/hissing sound from all the speakers. It doesn't matter which input is selected, they all have the same issue. Even before selecting any input at all, you can hear the buzzing/hissing as soon as the unit is powered up. Any help would be much appreciated.
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Go through the diagnostics section of the service manual here. You can start at "Step 2: Power Supply".
Let me know where you get to.
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Right from the start checking pin 1304 for 12v, I only have about 3.8 to both pins
And now I must have touched something I wasn't supposed to because now I have no power to the unit at all -_-
@Jay Castvan Is there any AC voltage coming out of the transformer?
How would I be able to test that? I do have 120v going in, just not sure which set of wires if the voltage out
@andrewsawesome I got the unit to reset, and now I have power to the unit again. So now I'm back to where I started with the buzzing/hissing sounds coming from the speakers
Change the electrolytics around the 1.2 VDC switching regulator for the DSP (see service manual).
I used two parallel capacitors for each capacitor I replaced. The capacitors need to be low-ESR. Paralleling them even halves the ESR. If you use wired capacitors, you are able to do some thermal de-coupling while leaving the solder pads exposed to add a 100nf X7R capacitor parallel to the electrolytics.
I repaired a few of these units. Main symptoms are weird sound out of the speakers or no audio at all. Except in "PURE DIRECT" mode where the DSP is not involved.
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Do you have a multimeter?
Andrew S さんによる
@andrewsawesome I do
Jay Castvan さんによる