Question about Audio & Video Receivers
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.
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
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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Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.
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