USHIN-SHOWA MLA MEISSNER card lock, inspection and repair due to malfunction

"I can't go out because I can't lock it all of a sudden."

I used it when I went out, but the door doesn't lock.It seems that the card key is used to lock and unlock the door, but I was told to insert the card and turn the dial to lock it.

I couldn't believe this content suddenly, but what kind of lock is it? I thought it was a set made by KEIDEN (KEIDEN).

When I arrived at the scene and checked, it was a MEISSNER (meissner) card lock made by USHIN-SHOWA.This is for short-term inspection.

It will be one of these three types, whether it is a card magnetic defect, a reader defect, or a defect in the link mechanism of the main unit.

There is also a case of poor positioning with the strike, so it is necessary to check firmly.

Start working.No misalignment with the strike was identified.The reader seems to read it correctly when I insert the card, but it seems that the link between the reader part and the main body locking mechanism is not working properly mechanically.

Even when I disassembled it, I didn't see any dirt that I was worried about, but the "crab scissors" that are part of the link mechanism are not working properly.In the end, I tried to remove the reader part, but it was improved by cleaning and lubricating it as it was.