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This is the Loopback Test mode to connect "Send signal" with "Receice signal" by inputting two number.

Input number is 6,7 and 8 and the mode is as follows
(I) :  Input    6.SP-phoneMIC  7.HandsetMIC  8.HeadsetMIC
(O): Output  6.SP-phoneSP   7.HandsetSP    8.HeadsetSP

1. Handset MIC  

→  Handset SP

       7                              7

    I :HsMic_WB
    O:HsSp_WB

*WB:Wide Band
→ No sound

2. Handset MIC  

→  SP-phone SP

       7                              6

    I :HsMic_WB
    O:Sp_WB

→ Sound OK

This result shows there is a problem in the signal path of Handset SP.

Just power off.

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Units are reset to the Factory settings by this operation (Erase stored IP address etc.).
This operation should not be performed for a usual repair.

1. Press "1", "5", "9" and "

" keys at the same time within 4 seconds after power on.

2. Release keys after "Now Loading" is displayed on LCD.
3. "Please wait..."is displayed.

After 40 seconds,all  Red LEDs of CO line turn on. 
(Beep sounds  is heared)

4. After all green LEDs of CO line turn on, 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 and new Serial number label to the unit by placing over the old label.

Attach the new label

Attach the new label

NEW MAC Address Label

NEW Serial Number Label

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