1. The safety door is not closed.
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This is the most basic reason: If the front door is not completely closed, the machine will display an error and will not allow radio operation.
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Troubleshooting: Close the front door tightly, clear the error message on the screen, and try the operation again.
2. Control signal (IO) error
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Check on the IO Output page (F4 -> F4) forward (usually pin 07 ) and reverse (pin 08 ) radio signal pins
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If the signal pin on the motherboard is not producing power or is always producing power (due to a faulty contact), the technician will instruct you to switch to a backup pin (e.g., pin 29 ).
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Go to the configuration page (F6), enter the password 1234 , select page F3 to change the output port address from 07 to 29.
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Move the corresponding signal wire on the motherboard to the new pin position.
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3. Kiểm tra đường dây và van điện từ
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Use a multimeter to measure the 24V voltage at the forward and reverse valve connectors.
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In the video, the specific fault identified was a loose reverse radio signal terminal . After re-secured the wire, the signal reached the valve normally.
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Check the solenoid: If power is being supplied to the valve but it still doesn’t work, measure the resistance of the solenoid (normal value is around 22 Ohms ). If the resistance is abnormal, the solenoid needs to be replaced.
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Valve cleaning: If the solenoid is in good condition, the final step is to remove and clean the hydraulic valve as there may be mechanical jamming.
This process helps technicians quickly eliminate operational and control errors to get the machine back into production.