Kurzweil pc88mx with no sound


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I have an older Kurzweil pc88mx that when I turn it on there is sound, but only for about 3 seconds. it seems to die off. if I turn it off and on again, the same thing happens. does that possibly indicate a battery problem?
 
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happyrat1

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Possibly a blown output transistor with thermal disconnection of the internal lead as it warms up. Do you have alternate outputs on your Kurz? Also what happens when you try headphones?

Gary
 
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freaky thing just happened. I wasn't sure about the alt outputs so I opened the case (with the instrument vertical, because it's so heavy and hard to handle) and checked the back panel. tested the headphones (which I couldn't swear on last night that I did) and it worked fine. now I've laid it out in playing position, tested it again and all is well (at least for right now). I don't think I trust it, yet. i'll take down the equally heavy m-audio keystation and test out the Kurzweil. thanks for your response since it made me try it one more time. something isn't quite right, but I know at least it could work.
 
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happyrat1

Destroyer of Eardrums!!!
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OK, prolly not a thermal fault then. More likely a loose or oxidized connector or bad solder joint on a connector.

I'd suggest opening it up and unplugging and replugging the internal connectors like the ribbon cables and taking a good close look at the audio output jacks for any bad solder connections.

Gary
 

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