you said "without going to the PCB." well, if the person before you used an adapter or wired the JAMMA harness to the test buttons, then you just need to slide the black switch inside the coin door or hold in the red button while you turn the game one. One should go to test menu and the other to service menu. Then push or slide to advance through the screens, and use buttons to make changes or save.
When I install new harness in cabs, I wire up the test and service buttons to double-duty on the control panel buttons (test to button #2 and service to button #3 if there is one or Start 2 if not) so that people can access the menus at powerup without opening the coin door or getting in to the PCB...