does it have 2 white buttons on the door frame that get pushed in when the door is closed?
if it does one will have 4 wires & one will have 2 wires. the one with 2 wires is the memory protect switch. make sure that this switch is working.
try removing one of the wires off the white switch with 2 wires and try the adjust buttons again. (remove the wire with the pin turned off)
Being a WPC95 it should have the Interlock switch assembly unless its been Eurohacked
tmAlthough - if the coin door switch is not operating it should display an error on the DMD ie..Open coin door...
Andrej indicated he is a novice so I wouldn't suggest to be pulling out wires just yet until the problems been identified.
Andrej - Where did you buy the pin (ie commercial seller) and how long ago did you get it?