AV Receiver Pioneer SX-217

[volverine357]

Hi, my receiver's right channel is quiet. When I turn up the volume to loud, it turns on and stays operational. I tried heating up the transistors with a hair dryer, but that didn't help. Is it even a transistor problem or should I be looking at something else? Thanks.

 

[Martaine2005]

I tried heating up the transistors with a hair dryer

You cool them, not heat them.
Is this units volume control digital or a potentiometer?.


Martin

 

[volverine357]

 

[volverine357]

Here are some photos
https://ibb.co/Htphsbs
https://ibb.co/9wJMhQT
https://ibb.co/x7jh29H
https://ibb.co/Wvp7T3k
https://ibb.co/PYm97M
Looks like they don't work

 

[volverine357]

Volume is digitally controlled. Should I freeze the transistors? I once fixed RAM by heating it up. (Power off of course)

 

[AnalogKid]

None of the links in post #4 work. Also, we need photos of the inside of the unit.

ak

 

[volverine357]

Photo gallery here:
https://postimg.cc/gallery/7615Kxc

 

[AnalogKid]

The STK412 is a dual, 150 W/channel audio power amplifier hybrid module. You have two of them, for the two main channels and the two surround channels. Of those four outputs, which ones are behaving correctly and which ones are not?

Also, are the sub woofer and other outputs behaving correctly?

ak

 

[volverine357]

The STK412 is a dual, 150 W/channel audio power amplifier hybrid module. You have two of them, for the two main channels and the two surround channels. Of those four outputs, which ones are behaving correctly and which ones are not?

Also, are the sub woofer and other outputs behaving correctly?

ak

It seems like everything else works fine just the right channel is acting like it's fried or something

 

[AnalogKid]

Hi, my receiver's right channel is quiet. When I turn up the volume to loud, it turns on and stays operational.

1. When it turns on, is it distorted? Also, is its volume approx. the same as the other channel?

2. After it comes on, does it stay on when you turn down the volume? If it does, is it distorted or out of balance?

ak

 

[volverine357]

When I turn it on it's almost inaudible. When I play something loud enough it fixes it, but until the restart.

When I turn down the volume it sounds fine, maybe a tiny bit quieter than the left one.

 

[volverine357]

1. When it turns on, is it distorted? Also, is its volume app

2. After it comes on, does it stay on when you turn down the volume? If it does, is it distorted or out of balance?

ak

Also it's kind of cracking like a mildly durned up speaker

 

[John Canon]

Somebody has to ask: you tried swapping the L/R speakers, right?

 

[volverine357]

Somebody has to ask: you tried swapping the L/R speakers, right?

Yes, It's not the speaker

 

[John Canon]

I bet it is a broken or cold solder joint. So look closely at every solder joint where the component lead goes through the PC board.

If each one is not shiny and smooth give it a quick touch with your small point soldering iron and a tiny dot of fluxy solder. Leave any SMD solder points for now, or you can look with a magnifier.