Download the manual here:
http://www.crazykong.com/manuals/RaidenFighters.man.pdf
This is in Japanese unfortunetly.
You can dl the Raiden Fighters 2 manual here, which is in English:
http://www.crazykong.com/manuals/Raiden ... s2.man.pdf
Every pcb has a parts side and a solder side.
gently connect pin 15 from the parts side to any grounded pin and it will instantly take you to the test mode. You can do this when the pcb has been powered up.
In the Raiden Fighters 2 and Jet manuals there is mention of being able to flip a dip switch. My board does not have such a dip switch bank, so I just connect ground to pin 15. Good luck
And in the Japanese manual pin 30 is the equivalent to pin 15 in the English manuals. If you're not absolutely sure what you're about to do, ask again. My explanation might just be a tad dodgy.
Be careful in any case. Good luck.