The key doesn't close. MIWA-PR.USHIN-SHOWA-QDJ696

"Key Malfunction Repair"

I was told the lower key wouldn't close.I thought it was the deterioration of the cylinder over time, but since it is a relatively new property, there must be some other cause.

Since it is a USHIN-SHOWA QDJ-696, the main unit may be defective.

The thumbturn and cylinder worked fine.So what's wrong with the strike?When I checked it, the strike was installed at the last minute position.

Mark the position of the deadbolt and reattach it about 4mm to the upper side.

It's a bad installation at the beginning, but there's a lot of things like this.Unfortunately.