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turn on reset key on power supply(make sure reset light comes on on power supply.
power down, then back on. yoru odds setting display should now be on. select your odds setting then turn off reset key (default/standard odds setting is 5)
that should do it.
you can also try turning the outer door key to the left sometimes that will reset a fault if it isnt too severe of a fault.
also read this
http://arcade.50megs.com/pachislomanual/resetpro.htm
and this
http://www.angelfire.com/ct3/pachislo/PachisloOperation.pdf