Pioneer Dj DW40-W works only through headphones mini jack

Hello

I need your help!

Pioneer Dj DW40-W works only through headphones mini jack.

If the headphones are disconnected from the front plate minijack, speakers do not switch back into the speaker mode and thus does not play anything.

However they are technically working as when the heandphones are connected to the front plate mini jack the sound is comming through.

I guess it has something to do with the switch between the speaker mode and the passthrough frontplate headphones mode not going back into the main speakers mode.

Will much appreciate any advice.

Thank you in advance!