Panasonic KX-TD7895 - Digital Spread Spedtrum..., Service Manual

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(1) RF unit error
(2) EEPROM read write error
(3) EEPROM stored data error
(4) Codec IC error
10.6. SELF DIAGNOSIS ERROR(HANDSET)
If you see the need repair X (X means ldigit NO.) on LCD display of Handset when you turn on
the Power Switch, Self Diagnosis error is detected by CPU.
The errors are occurred by following five reasons.
(1) RF unit error
(2) EEPROM read write error