kyocera taskalfa 255 error c0840

[javier4065]

my problem is that display says c0840 error code , what does mean it? How can I solve it ? thanks in advance maybe is the mainboard I think.

[javier4065]

Re: kyocera taskalfa 255 error c0840

Manual says: Faults of RTC. The time is judged to go back based on the comparison of the RTC time and the current time or five years or more have passed.

Reasons: - The battery is disconnected from the main PWB.
- Defective main PWB.

I think the Date and Time settings are wrong.

Maybe i can change it or date .well i'll do that and i'll see what happen thanks