Hello,
I assumed that you loaded a fresh battery set and with correct polarity ,otherwise it does give such signal.
If you have the user manual,please check the other alternatives on trouble shooting section.
If you do not have a user manual you can visit
the site below where instruction manual copies for Pentax,
www.pentax-manuals.com
It's
not an official site, but the manuals for downloading are better
quality copies and in color
where possible: and they have the MZ30 too.
Regards
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