Aiwa mx-z9400m sound issue

[Stormforce]

Hi all

I have recently acquired an Aiwa mx-z9400m system, there is a sound issue that affects the right channel only (both speakers and headphones)
The issue is present no matter what input is selected.

The sound is similar to say a bag being scrunched up and the occasional popping sound to.

I have had a visual inspection of the board and there is nothing glaringly obvious all the caps look OK with no obvious leaking or swelling etc.

Hoping someone may be able to point me in the direction of what maybe the cause of this.

Thanks

[stj]

Re: Aiwa mx-z9400m sound issue

sounds like you should start with the soldering of any pots on the front.
that type of thing.

[R_J]

Re: Aiwa mx-z9400m sound issue

It is likely a bad audio output ic, It might be a STK4182-MK2 . Also the headphone signal comes from the audio output ic same as the speakers

[Stormforce]

Re: Aiwa mx-z9400m sound issue

Thanks the info, is there a way to test the existing one? Or just get a new one and see if it fixes it.

Here is a photo of the board for info, which IC would it be?

[stj]

Re: Aiwa mx-z9400m sound issue

given the cost, i would test them by swapping them over first!

[Stormforce]

Re: Aiwa mx-z9400m sound issue

Hi All

Managed to hold of the service manual and replaced the STK-419-120 as this goes to the speakers and headphones, unfortunately it hasn't made any difference at all.
Symptoms still persist on the right channel (cracking/popping and lower volume than the left channel)

So just looking at any other possible causes?

[CapLeaker]

Re: Aiwa mx-z9400m sound issue

the headphone jack and the balance pot.

[jasonr2000]

Re: Aiwa mx-z9400m sound issue

hi @Stormforce you wouldn't happen to have the service manual by any chance ?

as ive got the same unit but my symptoms are different slightly.