Physical Error

	BF	ST
Master LED Condition	Light OFF	Red Light Blinking
Absent Slave LED Condition (Physical error)	Red Light ON	-

Process Flowchart

Causes of Error

Possible Cause	Examination Method	Countermeasure
Electrical surges of device power supply	Measure voltage of the device power supply at the trouble unit. → It should be within the range of sufficient voltage for device operation.	Check voltage of the device power supply.
Broken unit	Replace the trouble unit with a new one. → Verify whether the problem is fixed.	Replace the unit with a new one.