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Units are reset to the Factory settings by this operation (Erase stored Phone numbers, Caller list and etc.).
This operation should not be performed for a usual repair.

1. Connect power plug(AC adaptor/PoE)
2. Press "1","5","9"and "*" at the same time within 5 seconds after power on.  

Keep it until "Now Loading" is displayed on LCD.

3. Release keys.
4. After 10 seconds,all red LEDs of CO line turn on.

Beep sounds is heard.

5. Soon,red LEDs of CO line changes to green.
6. Power off.

When replacing the Main P.C.B., customer data shall be renewed before sticking the included MAC/Address.

(*1) : If you reuse defective P.C.B. for another repairing unit by repairing. Peel off the serial number and MAC address label on
original bottom cabinet and keep them with defective P.C.B..
(*2) : If you do not reuse the defective P.C.B. by repairing, scrap the P.C.B. to prevent the leak of customer's information in flash
ROM.

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Attach the new MAC address label to the unit by placing over the old label.

Attach the new label

NEW MAC Address Label

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Refer to waveform (6) in  Waveform (P.64) .