HIKVISION DS-K3G501 Quick Start Manual page 5

2.2 拆下 4 颗机芯螺丝，取下机芯。
2.2 Remove the four screws and take off the movement.
2.3 将机芯上的吸合式电磁铁拆除，然后重新安装到新的机芯下。
2.3 Remove the pull-in solenoid on the movement, and then reinstall it under the new
movement.