Problem - no component signal on all 5 old sony monitors

[monkeynuts]

Hi - I have puchased 5 old sony broadcast tv monitors - BVM-1415p and BVM-2015p - all have working inputs on the composite but appear to have a problem displaying component (can't test RGB as do not have correct output). I have already spoken to a broadcast engineer who suggested that they may be set up oddly in the engineering menu. Anyone know the way to access the engineering menu on these models? Apparently some strange combination of key presses as you start up the thing? ANY HELP APPRECIATED !! THANK YOU !!