Press and hold the SEL button to bring up the PSM menu. Use the up/down-arrow to select "DEMO", then turn the knob to select "DEMO OFF" and press the SEL button. Full details are in the lower-right corner of the first page of the manual.
SOURCE: Trying to set clock time
http://resources.jvc.com/Resources/00/01/15/GET0582-
001A.pdf
you will find the instructions on the link above
SOURCE: How to switch off the demo on a JVC car radio
press and hold the select button and and when it says demo turn the volume knob until it says off then press select
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