• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Nikko STA 5010 Issues...

50 Green said:
@avionic will hopefully jump on here soon (he knows volumes more than I do) but judging by the schematic, C662 should be in the area I've circled in red. Based on capacitance, compared to others electronically adjacent, and its connection to other components, I think it's likely the larger cap that I've circled in yellow.It's quite possible that the silkscreened number is hidden under it.)

It won't be "part of" Q662. ("Q" designates a transistor.)

View attachment 2110607
Click to expand...
Hey, I really appreciate this! Makes sense as to why I didn't see the numbers now... I am debating if I should just order all the necessary replacements or try doxifying first as I would have to buy a can of a deoxifier.
 
avionic said:
Probably some CAIG Deox-it...
Click to expand...
Before finally proceeding with the deoxit, I am a little unsure of what to hit with the stuff? Rear inputs? Speaker connectors slots? Areas behind front knobs? Last thing I want to do is cause more problems...
 
Deox-it needs to be applied to the internal switch contacts and internal potentiometer wiper and resistance pads.
 
avionic said:
Deox-it needs to be applied to the internal switch contacts and internal potentiometer wiper and resistance pads.
Click to expand...
I finally got around to this today, applied Deox-it to the areas you said to. All the knobs were turning smoothly, smoother than ever before. It was working great, both channels were going strong with no crackle. Until suddenly a loud noise, I thought it came from outside but no it was crackle building up. Now I cannot hear any music from either channel, just crackle. Thoughts? Could I have done something wrong? It was unfortunate I tell ya, like being a few feet from the finish line and tripping on your shoelace.
 
Sounds like a bad solder connection possibly in the power supply..
 
Exercise the connect/seperate switch. Possibly on the rear panel by the pre-out/main-in RCA jacks.
 
avionic said:
Exercise the connect/seperate switch. Possibly on the rear panel by the pre-out/main-in RCA jacks.
Click to expand...
Finally coming back to this. Decided to see how things were after not touching it for a month and half and it was working fine, no scratchy sound. Wanted to try a different set of speakers, one of them was broken so went back to the kenwoods I was just using. Now the scratchy sound is back with a revenge, but only when I have a speaker connected to the right input. Should I try another round of deoxit? How do you mean exercise said switch? Should I use deoxit?
 
coelacanthy said:
Finally coming back to this. Decided to see how things were after not touching it for a month and half and it was working fine, no scratchy sound. Wanted to try a different set of speakers, one of them was broken so went back to the kenwoods I was just using. Now the scratchy sound is back with a revenge, but only when I have a speaker connected to the right input. Should I try another round of deoxit? How do you mean exercise said switch? Should I use deoxit?
Click to expand...
Are you saying it's fine with one pair of speakers but you get the problem when you play it through the second pair? Could the issue be the speakers?
 
50 Green said:
Are you saying it's fine with one pair of speakers but you get the problem when you play it through the second pair? Could the issue be the speakers?
Click to expand...
Tried it with different speakers and it sounds the same, bad. To clarify, when I have any speaker connected to the right channel I get varying levels of noise. When there is no speaker connected to said channel, there is no noise. Initially, I wasn't getting anything out of the right channel. Used deoxit and it worked for perfectly for a minute, then this noise set in. Also, this crackle noise is present when no speakers are connected and using headphones.
 
coelacanthy said:
Tried it with different speakers and it sounds the same, bad. To clarify, when I have any speaker connected to the right channel I get varying levels of noise. When there is no speaker connected to said channel, there is no noise. Initially, I wasn't getting anything out of the right channel. Used deoxit and it worked for perfectly for a minute, then this noise set in. Also, this crackle noise is present when no speakers are connected and using headphones.
Click to expand...
1.Exercise the right channel circuit breaker on the rear panel .. Maybe a dirty breaker contact.

2.Get a spare interconnect cable and jumper the Pre-out / Main - in left and right RCA jacks on the rear panel..
Left-in to left out...
Right - in to right -out...
This by-passes the coupler switch***. < ---- did you deox-it that switch ?
Might just try exercising the connect/seperate switch*** a couple dozen times..

*** connect/separate is a coupler/de-coupler switch...
 
Last edited:
I may be out in left field, but sounds like original problem is DC offset - there is no protect circuit except for the circuit breakers, and the DC sounds like a hum on the speakers before the breaker trips. Also, the trimmers for both DC and Bias are notorious for becoming intermittent. And now, you may have bad woofers, from the DC. Also, the input pair of the bad channel of the amplifier is probably causing the original issue. Get some beater speakers, and watch the cones when amplifier is connected. Check DC on the speaker outs, with no speakers connected. My 2 cents....
 
You must log in or register to reply here.
Back
Top Bottom