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schematics for yamaha rbx 375

i have the "battery problem" with an rbx (it dries out very quickly) and i find out it is a wiring problem that rbx bases seem to have so i need the schematic for Yamaha rbx 375 to fix it. I tried to mail to the dealer but no response came from them so if there is anybody that could help me i would be most grateful.
 
The negative terminal on the battery should be going to the ring terminal of the output jack.

Use an ohm meter to make sure that there is an infinite resistance between the ring and sleeve terminals with the bass unplugged.

As stated above, you don't need a schematic for this type of issue.