<Do you mean it only has sound out of the headphones when connected and not out of the speakers when the headphones are disconnected? If so, your problem may be as simple as a dirty contact in the headphone jack.
Yes it only has sound out of headphones. How do I clean the contact? Don't want to mess anything up.
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SOURCE: I have a yamaha electone hs4, The foot pedals do not work.
JM: Your problem is this: There are rubber washerson the bolt that holds the pedal on. They are shot. Most likely Yamaha doesnot have the parts.Go to the plumbing dept of a hardware store and get some faucet washers and replace them. YYou can tell if the washers are shot by tiping over the organ and looking at the pivot bolt. Most likely that is yoiur problem. I am an organ tech. and have replaced many of these. DM
SOURCE: no sound from Yamaha Electone HS-6
First check if you get sound from the headphone jack.
Do you hear anything as the power comes on from the speakers..? A slight bump?
A lot of these dead audio things can be traced to a failure at the expression pedal. often these use a light dependent resistor and the illuminating lamp burns out. This is all down by the pedal.
Many of the Yamaha organs, including the FX20 I have, have circuitry that checks that the power amp has DC balance before a relay closes to connect the speaker. A failure in the amp can cause dead sound as well.
SOURCE: Model C-60 Yamaha organ. Loud hissing sound
This is likely in the power amp or the drivers for it.
The key to troubleshooting is a schematic. Try to procure one.
You MIGHT try using circuit cooler in the area of the power amps to isolate a bad component or cracked circuit board.
SOURCE: need an operator's manual for yamaha electone el-15
You can find it here
http://www2.yamaha.co.jp/manual/pdf/emi/english/ele/EL15E.PDF
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