适合先电话说明的情况Situations to describe by phone
- 钥匙断在锁芯内Key broken inside a cylinder
- 钥匙可以插入但无法转动Key inserts but will not turn
- 钥匙转动但锁舌没有回缩Key turns but the latch does not retract
- 关门后变紧或门框挤压锁舌Binding after closing or frame pressure on the latch
联系前准备Before calling
- 停止强扭，不要把断片推得更深。Stop forcing the key and do not push a fragment deeper.
- 保留手中断片并拍摄断口。Keep the broken piece and photograph the break.
- 拍摄锁芯、门边锁舌、门框孔位和整扇门。Photograph the cylinder, latch edge, strike opening and full door.
- 说明开门与关门时症状是否不同。Explain whether symptoms differ with the door open versus closed.
操作前确认原则Confirm before work begins
先核实身份与进入授权，再根据门、锁、钥匙及现场情况确认处理范围。锁型、故障、零件、时间与地址可能影响方案和费用；任何新增工作应在操作前说明并获得同意。Verify identity and authorization first, then confirm scope based on the door, lock, key and site conditions. Hardware, failure, parts, timing and address may affect the approach and cost; explain and approve added work before it begins.