Press the key patient chair up and down before and after, you can hear the sound of relay, but the chair does not move, this phenomenon indicates that the control loop, no problem. Check AC24V, ACl2V normal. Wherein ACl2V control circuit power supply, AC24V for the DC power supply. After checking the rectified voltage, no DC24V output. View check circuit control board found scorch marks near DC24V rectifier bridge rectifier bridge which measures the arms has breakdown, because there is no DC24V, so although the relay pull, but because of the lack of electrical power, so the chair does not work. Analysis of reasons: The first element is the quality, but off, the second motor stall, causing a short circuit. Check the motor continue down the normal, excluding the second reason. Remedy: Since the control circuit printed wiring board near the bridge rectifier has been blown, only replace the rectifier bridge to cause difficulties, decided to replace the entire board. Should be replaced with a new board of the original 1203 chip circuit board mounted to unplug the new board to continue to use the original data store. Remove the wires, connectors and other color-coded according to its original position and connected, power-commissioning work chair.
Pressing on the best dental chair, down, front, back key, the chair does not move nor relay sound. Open the front cover inspection, AC-DC power supply is normal, if the plugs, no loose wiring, gas control switch is turned good. You should check the key signal line is normal. Inspection method: Unplug the control circuit board signal line plug, a wire with a black line termination socket end and the other end on the other electrodes respectively touch the socket, observe whether the relay operation, the corresponding indicator light is illuminated. As compared with the normal signal conductors have a problem, the most likely reason is that the common black line is broken, identify the point of failure can be treated. If during the test relay no action, then the control board is faulty, replace the circuit control board.
If you have any questions, please contact: Email: cindy@medicalequipment-msl.com
Product details, please click:http://www.medicalequipment-msl.com/
