mitsubishi hs-412e no picture

[newzealand]

hi all
i have found one of these players, its in great cond and i have replaced the belts,
all mechanical operations are working well ,
however im not sure how to get a picture from the unit,im using the yellow video out rca along with the red and white stereo out puts for the sound,
i get the sound no problems,
i have no experience with vcr hook up,is there a setting that changes picture output from the ariel to the video rca plug?
or a button that needs to be pushed to get picture ? i guessed that since the sound is good it should produce a picture?

has any one seen one of these units or worked on one? its very heavy and seems to be solidly made ,
it looks like a 80s unit,
im so excited about getting it going and watching my video collection thats been sitting about for years
any input would be helpful
mike