Hi Dear friend
Great thanks for your huge effort to help me.
At first I should appologize for a mistake:The error code is "F498
" no "F489".So do excuse me for that.
Yes ,I consulted the local Panasonic service center,But they couldn't find this error code in their service manuall.Even they couldn't find my machine in the list .Mine is RV32E-S but all the machines included in service manuall were RV32Pxxxx
I also tried to reset it by unplugging from the main for 15-30 minutes.during the 10 days of appearance of this problem,such a trick caused just 2 sessions of proper functioning but next time I tried to turn it on I encountered the problem again and in last 4 days even that trick never worked.
Amazingly during those short periods of functioning,everything was good and I had no problems in both firmware function or mechanical function.
Again I thank you for your kind help to me.
Looking forward to hearing from you again.