Locked n Loaded setup - lightgun

[eds1275]

The calibration needs to be set on Locked and Loaded. To do so, you need to hold down a test switch and flip a dipswitch. I can't get it to register when I hold down the button and enter the mame menu - any ideas?

[eds1275]

OK, so I got into the calibration screen by turning the service dipswitch on, then holding down the test button while resetting. I figured that was a victory. But then it tells me to shoot at a target on screen but there is no target!

I've got the manual http://www.arcade-museum.com/manuals-videogames/L/Locked%20And%20Loaded%20Operation%20And%20Service%20Manual.pdf and as far as I can tell I'm doing it right but there's nothing for me to calibrate with.