This procedure will take you to a GX-700 Test Mode were normal GX-700 users shouldn´t be so don´t try any of the tests if you don´t want to send the GX back to the factory for repair.. :)

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Hold down the SP.SIM and PREAMP buttons while turning on the power. The system version will be displayed directly in the window.

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After you have done this just press the PLAY button to restart to GX-700 in normal mode.