Yamaha Psr-410 pitch bend twitching when I try to raise the tone. (When lowering the pitch, the pitch bend works fine. And one more problem: when I turn on the auto-accompaniment mode, the accompaniment plays a half tone higher than the right side of the keyboard. However, when the accompaniment is turned off, the musical scale is normal.Has anyone encountered such a problem?
PS: tests No. 1, No. 2, given in the service manual, do not pass.