SOURCE: Pentax K2 Shutter and mirror problem
Without a stripdown it's not possible to give a definitive answer. Clearly the mechnical interlock which prevents the shutter from firing until the mirror is out of the way is not functioning correctly, but pressing the dof button overcomes this.
It's possible that something has broken or worn internally, but far more likely that old dried camera grease coupled with decomposing gooey foam bumpers and light seals has gummed up the workings.
Now that film SLR's are ten a penny and often free on FreeCycle it's certainly makes no economical sense to repair this camera. But it's a real classic and a delight to use so it's worth sending to a professional repair shop for a thorough service just as you would with a classic car or motorbike.
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