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Onkyo TX-8555 Left channel crackle

havenforbid

New Member
I have an Onkyo TX-8555 receiver/amplifier I've had since about 2008. Recently I started hearing crackling noises in the left channel. The noises are intermittent, not constant, maybe once every 10-30 seconds. It's not that loud but it's just noisy and persistent enough to be irritating.

After testing speaker connections and switching around the speakers, I've concluded that the issue has to be in the receiver. It occurs regardless of which speaker I use or which component (including the built-in tuner) I'm using. It doesn't seem to be affected by me turning the volume up or down, though I do sometimes hear it when I turn the Balance knob. I suspect I may have let too much dust accumulate over the years. I've never opened up the cabinet and tried cleaning it with compressed air. I don't know how much that would make a difference,

Are there other things I should try before trying to take it to a local repair shop? Oddly enough, the local repair shops don't seem to be taking new tickets, though I'm still looking into other options. I don't know if the repair bill would approach or exceed what I'd pay for a new unit of similar quality.
 
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Before taking it to a repair shop, buy some Deoxit D5, unplug the receiver power cord and open it up.
1. Carefully vacuum all the dust out using an acid brush to help dislodge the dust. Be gentle and careful not to bend any components.
2. Inject a small amount of D5 into any opening you see in the balance control and work it back and forth 30 times. The volume control is probably sealed so you won't be able to clean it, but work it back and forth 30 times.
3. Inject a small amount of D5 into any opening in the body of each speaker switch and work the switches 30 times.
Do not replace the coverr, but hook the receiver up and play it for awhile to see if the noise is gone. If you hear the noise, get a plastic probe like a Bic pen and tap on the speaker relay. It's a black plastic box about 1/2" x 1" x 1" and located on one of the pc boards. If the noise gets worse or goes away, the speaker relay needs to be replaced. This requires soldering, but it's information you can give to the tech.
 
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