Examples of deteriorated parts
♦ Door hanger
![](/ckfinder/userfiles/images/sonha-Spare-Parts-Replacement-01.jpg)
► Abnormal noise generation and rattling
► Door comes off (derailing)
► Increased running resistance puts a burden on the power section and breaks down
♦ Pulley
![](/ckfinder/userfiles/images/sonha-Spare-Parts-Replacement-02.jpg)
► Abnormal noise generation
► Shutdown due to damage
♦ Motor
![](/ckfinder/userfiles/images/sonha-Spare-Parts-Replacement-03.jpg)
► Abnormal noise generation
► Pulliness of pulley shaft
► Does not work, malfunction
♦ Sensor
![](/ckfinder/userfiles/images/sonha-Spare-Parts-Replacement-04.jpg)
► The reaction is slow and does not open
► Repeat opening and closing
► Closes suddenly
♦ Electric lock
![](/ckfinder/userfiles/images/sonha-Spare-Parts-Replacement-05.jpg)
♦ Do not open