4. Drive board fault
Picture 16 or 18 , measure the travel motor patch switch 4148, patch resistance R77,R44, Drive axle LP205D, Electrolytic capacitor
whether they are fault. Check drive axle with signal, with the signal input the fault is from the Drive axle and the drive board circuit, if
without signal input, the fault is from the chip program or the circuit, repair or exchange the drive board.
IV. Troubleshooting 4 —— actuator reclining and inclining fault
▲ Actuator fault with the following performance
1.Reclining Angle memory function loss , but the calfrest &backrest cylinder normally working when in manual mode.
2. Both actuators working on single direction
3. One actuator working on signal direction
4. Backrest actuator will keep reclining no matter press reclining button or
inclining button
5. One actuator fault with reclining and inclining.
▲The Failure analysis method
1. Reclining Angle memory function loss, but the calf rest & backrest cylinder
normally working when in manual mode. See picture 22, the detection board
inside the cylinder fault that cause the signlechip in the drive board cannot catch
the signal of the screw rotation laps, in other words, the memory function loss.
2. Both actuator working on single direction
During the cylinder reclining &inclining, The relay is for exchange the power
supply polarity that is inside the motor of cylinder to make the motor change its moving direction. The DC24V power is asked by the
relay to keep its normal work. If the relay cannot change the direction, the motor will keep working to the same direction, No matter press
reclining or inclining button. The fault is from the drive board “LM2571-12” regulator. Repair or exchange it
power cord of motor in the
actuator
Figure 19 Real picture of actuator inner checker
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