How do you recalibrate arcade gun on namco point blank game

Gun Sight Set-Up 1 To initialize gun sight set-up press and hold in the Service Button and slide the Test Switch ON. 2 Test screen for player 1 gun will appear. To adjust player #2 gun press the Service Button. 3 Follow the instructions on the screen. 4 When set-up is completed ensure Test Switch is returned to OFF.