Hi there,
I have a Yamaha PSR31 keyboard that does not turn on. I troubleshoot every component I saw, and all seemed to read normal values.
Now what's confusing me is that there is a battery voltage across the negative pole of the battery to the ground of the PCB.
When the power is connected it measures 12V across the - and + poles on the PCB. But also 12v across - and ground of the PCB!!
Is this behavior normal or am I having a short somewhere?
The board is from 1986, so it's the old PCB style where all the component are big and easy to work with.
Thank you
I have a Yamaha PSR31 keyboard that does not turn on. I troubleshoot every component I saw, and all seemed to read normal values.
Now what's confusing me is that there is a battery voltage across the negative pole of the battery to the ground of the PCB.
When the power is connected it measures 12V across the - and + poles on the PCB. But also 12v across - and ground of the PCB!!
Is this behavior normal or am I having a short somewhere?
The board is from 1986, so it's the old PCB style where all the component are big and easy to work with.
Thank you