character conversion problem about UTF-8-->SHIFT_JIS_2004

hi

I used Postgresql7.4.3 with php for more than 3years.
Now I want to change my database to Postgresql8.3.
But I occur such problem
----------------------------------------------------------
ERROR: character 0xe9ab99 of encoding "UTF8" has no equivalent in "SJIS"
ERROR: character 0xe9ab99 of encoding "UTF8" has no equivalent in
"SHIFT_JIS_2004"
----------------------------------------------------------
The database was encoded by UTF-8,
to export data as .csv file,
I use  set client_encoding='SJIS' at client.
When I use Postgresql7.4.3,no problem occur,
but after I chaged to Postgresql8.3 ,the error was occured.

Can I ignore the error message ?
or any othe method to solve this problem.

Thanks