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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