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Old 7th February 2010, 06:31 PM   #1
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Default SS Hi-fi Pioneer SA 6800

Having an Issue with this Amp, it powers on *in theory*, I hear the relay for the ease-in click, and nothing else happens.
BUT if I take a hair dryer, and heat up the heat-sink and the board after about 50 seconds on high heat, it powers on with no issues and gives continuous use without fail. once it's turned off again, same problem.

does anyone have Ideas on what would cause this?
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Old 7th February 2010, 08:53 PM   #2
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anyone? anything?
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Old 7th February 2010, 09:00 PM   #3
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You just posted 2 hours ago. Patience my friend.
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Old 7th February 2010, 09:43 PM   #4
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There is usually an over temperature sensing device mounted on the heatsink to protect the amp - check for a transistor or Temp sensor - sounds like this could be the source of your trouble.
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Old 8th February 2010, 12:20 AM   #5
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cal: sorry, I've been going to so many forums and reading over every bit of info I can, I have this piece and I'm attempting something else which I may also post about later, I got a little impatient since after everywhere I went I realized I might actually get some half decent answers here lol.

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Originally Posted by Jaimo View Post
There is usually an over temperature sensing device mounted on the heatsink to protect the amp - check for a transistor or Temp sensor - sounds like this could be the source of your trouble.
after looking over the schematic for the 5th time, I can't find anything attached to the heatsink, but I did happen to notice a protection switch indicated, which I cannot locate in the schematic. I'm going to keep looking, but if anyone can think of another reason for something like this to happen, I'd appreciate the input. this amp was a x-mas gift, if I can't get it to fire up on switch, I may just Gut it for parts...
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Old 8th February 2010, 12:28 AM   #6
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Just realized, I'm some stupid sometimes... the protection circuit is the relay I hear, which operates whether it boots or not...
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Old 8th February 2010, 03:41 AM   #7
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looked it over more intensely, there are 2 varistors screwed to the bottom of the heat-sink, but they're for voltage overload situations, still nothing dealing with overheating.

as a side note before I got the amp apparently it would power on fine and drop while it was on, is it possible the problem I'm having now stemmed from that issue? I would imagine so, but it seems like 2 extreme opposite issues.
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Old 8th February 2010, 05:12 PM   #8
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Look for "cold soldering" (or whatever is that called in elglish). Maybe re-solder all board?
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Old 8th February 2010, 05:40 PM   #9
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ok after messing around with some frozen beef and my g/f's hairdryer, I've pretty much determined that it's the varistors, any canucks know a good online source for electronic parts in canada? I've been looking around and I can't find any place that I can order parts, or replacement parts from.
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Old 8th February 2010, 05:41 PM   #10
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Originally Posted by wojtek5001 View Post
Look for "cold soldering" (or whatever is that called in elglish). Maybe re-solder all board?

I did that today to no avail, I didn't find any cold solders, but I Re-soldered a bunch anyway just to be sure, I either have to bypass the varistors or order new ones... which sucks because they're 5 bucks a piece USD from the only site I could find them, and they don't ship to canada >.<
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