Hi,
I need to repair a P-115 yamaha digital piano with a strange behaviour.
When I power on the piano from the dedicated on/off switch, the power led go to ON (red led), but the keyboard doesn't produce any sound, nor in the speakers nor in the headphones.
When I try to power off (pressing the switch for at least 1 second), the keyboard doesn't power off, the red led remains ON. I need to unplug the adapter cable to switch off the keyboard.
I checked the 12V voltage rail on the input PCB, after the power plug and it is OK.
I checked also the power switch on the dedicated frontal panel pcb with a multimeter and it works fine (when pressed 0 ohm, when released open circuit).
I tried to enter in test mode as described in the service manual, but the keyboard seems not to enter in that mode (C#2-F2-G#2 pressed at the same time and power on the piano, should follow a sound).
How do you suggest to proceed?
Thanks a lot.
I need to repair a P-115 yamaha digital piano with a strange behaviour.
When I power on the piano from the dedicated on/off switch, the power led go to ON (red led), but the keyboard doesn't produce any sound, nor in the speakers nor in the headphones.
When I try to power off (pressing the switch for at least 1 second), the keyboard doesn't power off, the red led remains ON. I need to unplug the adapter cable to switch off the keyboard.
I checked the 12V voltage rail on the input PCB, after the power plug and it is OK.
I checked also the power switch on the dedicated frontal panel pcb with a multimeter and it works fine (when pressed 0 ohm, when released open circuit).
I tried to enter in test mode as described in the service manual, but the keyboard seems not to enter in that mode (C#2-F2-G#2 pressed at the same time and power on the piano, should follow a sound).
How do you suggest to proceed?
Thanks a lot.
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