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I have vintage PIONEER SX1010 receiver that works great except for a problem with thte output cutting out intermittently, usually shortly after power on. It will come back on after a while and then cut off again and then on. I have heard this model had problems with cold solder joints but unsure how to pinpoint the problem.

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  • electroned19 May 22, 2009

    I have a similiar problem with this same model receiver but I get a low crackling sound on the left channel. Appears to be in power amp since disconnecting jumper bar for left channel didn't stop problem. Didn't keep it on long enough to not damage spkr. but sometimes after powering it up, you'll hear a loud pop from it. Sometimes unit may go into protect. Any ideal as to what board would be for left channel?

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This could be solder connections that are cold or cracked, you can look for them on the power supply board and the amplifier boards. Sometimes it is not an easy thing to remove the boards, but usually you can at least pull them out far enough to solder on them. Just make sure that you re-connect everything just as it was when you took it apart. The amplifier boards are connected to the heat sinks. If my memory serves me right, you will have 2 amplifier boards, one for each channel. The heat sinks have short fins on them and those two boards will have lots of bad solder connections. The power supply is normally not as bad, but is worth checking out. You may be able to see the bottom of that board without removing it. Just make sure you take the bottom panel off of the unit and, of coarse, the top cover. The power supply board is where the power transformer has it's secondary wires connected to it and you will have 2 very large capacitors on it.

Be very careful when you solder on these boards, make sure you have no solder bridges (where one solder pad overflows onto another close by), it is a very easy thing to do by accident even for the best of technicians. You will find lots of solder connections that look grainy and are not shiny silver in color, and some with a ring crack around them. Make sure that every single one of those are reflowed with solder.

You should also clean the controls with a good contact cleaner made for electronic switches and relays. Start with the power switch, that could even be the cause of your entire problem. Spray or get drops of the contact cleaner inside the switch and then work the switch by turning it on and off, over and over again. Sometimes it needs to be done several times. You may even need to open the switch by taking it apart, to clean it good. Be careful, sometimes they are not too easy to get back together again. If you take it apart, look at the contact that it has and you will see some black residue. That needs to be removed with some contact cleaner and a burnishing tool. Or you can scrape it with a small sharp pick like a dental pick or a very small file to run across it if you can not find a burnishing tool.

Then you should clean all the other controls like the volume control, balance, treble, bass, speakers and even the function controls. You should not take those apart, they may never get back together again.

Once this is done, you should have your receiver working almost like new again. That is really the best you can hope for.

If you feel like this may be a bit more than you can do yourself, a service center would normally charge about $200 give or take about $25 to refurbish your receiver depending on the rates of the service center. Your old Pioneer receiver is well worth the high service cost, people who own them rarely give them up. Being one of those people yourself, you are in the position to understand why. Most other people just don't understand what it means to have such high quality equipment. After all, it has worked wonderfully for you for what, about 30 to 40 years? Try getting that out of anything made today, good luck with that!

If I can be any more help, just let me know by posting back on this thread.

Dave

p.s. Anything less than a "FixYa!" rating would lower my overall rating so I would prefer no rating at all if you do not believe I deserve a FixYa! rating. I only do this free help for people to earn a high rating, it is our only reward.

Posted on Sep 07, 2008

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De oxit d5 on the contacts, fader lube on the pots. and recap the supply board.a new set of output caps would be in order to. get an audiokarma profile, its all there. i would pick my 74 sx1010 over the lattest denon

Posted on Oct 12, 2010

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