MIWA U9.HPD, Unlocking the entrance door due to operational defect and disassembly cleaning

"Cylinder disassembly and cleaning due to key defect"

The client said she had the key but it wouldn't turn, but when I arrived, she had already entered the room. Apparently, it took 20 minutes to unlock the door on her own.

However, it was found to be quite hard, so we decided to have it inspected and repaired. Repair work was completed by disassembling the cylinder, cleaning the cylinder, and checking its operation. It seems that the cause was dirt due to aging.

When unlocking, I usually use a special tool for HPD for the left-hand, but this time I didn't need that tool.