Nikko STA 5010 Issues...

[coelacanthy]

I would like to see the underside of those two large caps..

I'll get back to you on this, I sincerely appreciate your help.

 

[avionic]

Probably need to clean your speaker select switches as well as the connect/seperate switch.

 

[coelacanthy]

Probably need to clean your speaker select switches as well as the connect/seperate switch.

Which one is the connect/seperate switch and are we talking deoxifying?

 

[avionic]

Which one is the connect/seperate switch and are we talking deoxifying?

Probably on the rear panel.. To connect or separate the pre-out to the main-in on the rear panel.

 

[coelacanthy]

I would like to see the underside of those two large caps..

Everything looks pretty clean down here.

 

[coelacanthy]

I would like to see the underside of those two large caps..

What do you make of this? If you look at the previous photo taken months ago it does not look this...burned?

 

[avionic]

It is probably OK. ...Just the camera angle and lighting...

 

[coelacanthy]

It is probably OK. ...Just the camera angle and lighting...

How did the underside if the caps look?

 

[avionic]

How did the underside if the caps look?

Old. . I was looking for signs of venting. Which I don´t see any..

 

[coelacanthy]

Old. . I was looking for signs of venting. Which I don´t see any..

They do look old huh, but pretty clean! Is no venting is good?

at this point, do you suggest I try deoxifying? I didn’t see any damaged connections or anything.

 

[avionic]

Is no venting is good?

Yes..

do you suggest I try deoxifying?

Yes, then re-evaluted the situation.

 

[coelacanthy]

Yes..

Yes, then re-evaluted the situation.

I'll procure a can and give it a shot.

I am currently only receiving a hum and intermittent crackle from the right channel while the left sounds normal, this is the same through headphones. Do you think deoxifying could fix this? I'l definitely give it a shot, need to get a can anyways for a guitar with crackle issues on it's volume knob. Just curious as I await the delivery.

 

[avionic]

Do you think deoxifying could fix this?

Its possible..

 

[coelacanthy]

Its possible..

Is a hum a good sign? It’s better than no signal at all I would assume.

 

[avionic]

Is a hum a good sign? It’s better than no signal at all I would assume.

Likely a capacitor in that channel or a cracked solder connection. At least it is not triggering the protect circuit.

 

[avionic]

Do you still get the hum if you separate the pre-amp from the power amp with the separate switch?

 

[coelacanthy]

Likely a capacitor in that channel or a cracked solder connection. At least it is not triggering the protect circuit.

So if deoxify doesn’t work, check the solder connections and then use an attenuator to check caps? What would the protect circuit do, just shut down everything?

Do you still get the hum if you separate the pre-amp from the power amp with the separate switch?

When I press the right channel switch that silences the hum and crackle heard through the right channel and the left channel can play in all its glory.

 

[avionic]

When I press the right channel switch

Wrong switch.... According to the service manual there is a connect/separate switch. It should separate both channels at once. It is usually on the rear panel close to the pre-out / main-in RCA jacks.

 

[avionic]

What would the protect circuit do,

In this case it is the two circuit breakers.

 

[coelacanthy]

Wrong switch.... According to the service manual there is a connect/separate switch. It should separate both channels at once.

Hm, where would that be located? There is a knob for a and b speakers but am using only a as b are rca jack style and i do not have any. Other that there is a balance knob for left and right channels?