故障现象 遥控诊断床在+90°时床面不能升降,床面后仰45°时床面所有动作都停止,失去控制,而球管及压迫器等动作正常。 故障分析及排除 首先检查床面的升降继电器R_2和R_3,经过修理并确认两继电器都工作正常后,但床面升降电机仍不转动。接着查看床面升降链条,发现链条掉下,拆下齿轮箱,把链条安装好,床面升降正常,可是所有床面运动程度出现混乱。手工把床面拉至+90°,检 Fault phenomenon When the remote control diagnosis bed is at +90°, the bed cannot be raised and lowered. When the bed is tilted backward 45°, all the actions on the bed stop, and the control is lost. The tube and the compressor are normally operated. Failure analysis and exclusion First check the bed lift relay R_2 and R_3, after repair and confirm that both relays are working properly, but the bed lift motor still does not rotate. Then look at the lifting chain of the bed and find that the chain falls, remove the gear box, install the chain, and the bed surface is moving up and down. However, the degree of movement of all the bed surfaces is chaotic. Manually pull the bed to +90°, check