Electone FX1 organ

[fastFX1]

Lights turn on, no sound. Power switch doesn’t light up. Can anybody give me advice and tell me how to open this up? Thank You!

 

[fastFX1]

found problem. mouse chewed wires

 

[John Canon]

found problem. mouse chewed wires

not again!

 

[fastFX1]

Power switch led doesn’t light up. LED runs on -15vdc and powers Mix4 board. Can anybody tell me where to check the -15vdc output. Yamaha FX1 Thank You!