Trying to convert utf-8 to WINDOWS-1251

Hello all
i have utf-8 file that i try to convert to WINDOWS-1251 on linux
without any success
the file name is utf-8 when i try to do :

file -bi test.txt 

it gives me :

text/plain; charset=utf-8

when i try to convert the file i do :

/usr/bin/iconv -f UTF-8 -t WINDOWS-1251 test.txt > test2.txt

it gives me :

/usr/bin/iconv: illegal input sequence at position 0

where the first string in the file is :

1CClient

what im doing wrong here ?

Please post hexdump or od of your file, abbreviated to some meaningful lines.