Roland JX8P Keyboard Power Issues

[SYSDOA]

Hi Again,

I need guidance on the power for this keyboard. It came in with no power to the screen and no sound at all. Power seems to be flowing as intended until a 5V supply that goes to the main board. I am reading under 1V. There is a 5V regulator that I have disconnected and the 7V of power off the secondary seem to flow fine. Is the 7805 regulator pinout for Japanese units different from a generic 5V regulator?

[Enzo]

Nope, input, ground, output, left to right.

If the 7805 puts out 1v, then either it is defective (most likely) or it is being loaded down.

[Jazz P Bass]

Here is the Power Supply schematic.


The complete set can be found here: http://www.florian-anwander.de/rolan...jx3p_schem.htm