Probleme mk 113

hello, I ve got a probleme with my kit there is only fire gun sound working
i use to have all of the sounds working but now pin 1 from ic is permanently connected with pin 5 from the sound selector
what can i do??

Check solderings for shorts.
Desolder switch and check funtionality with multimeter. If necessary, replace.

when i take the IC off the support evrything is soldered correctly when it put it back on place only machine gun is working!!cant explain that!could the IC short circuited??

the switch is working properly, by the way.

Check if pin 1 level changes when dip switch is changed when IC is removed. If this is the case, then the IC is defective.