UTF-8에서 2단 카테고리를 사용하고 있는데요~

-----
if ($is_category) {
    $nc_category_location  = "./board.php?bo_table=$bo_table&sca=$sca&sfl=wr_10&stx=";
    $nc_category_option    = get_nc_category_option($bo_table, $sca);
-----

<? if ($is_category) { ?>
    <form name="fcategory" method="get">
    <td width="50%">
        <select name=sca onchange="location='<?=$category_location?>'+encodeURI(this.value);">
            <option value=''>전체</option>
            <?=$category_option?>
        </select>
    <? if ($sca) { ?>
        <select name=nca onchange="location='<?=$nc_category_location?>'+encodeURI(this.value)+'&nca='+encodeURI(this.value);">
            <option value=''>전체</option>
            <?=$nc_category_option?>
        </select>
    <? } ?>
    </td>
    </form>
<? } ?>
--------------------------------------------------------------------------------

UTF-8에서 1단계 [분류(<? if ($is_category) { ?>)]에서 카테고리를 선택했을때는아래처림 잘나오는데.
board.php?bo_table=EIRABA&sca=%EC%84%9C%EC%9A%B8%ED%8A%B9%EB%B3%84%EC%8B%9C

2단계 선택을 했을때는
(<?=$nc_category_location?>) 분류된 카테고리는 불러오지 못하고 에러가 나네요~
board.php?bo_table=test&sca=서울특별시&sfl=wr_10&stx=%ED%85%8C%EC%8A%A4%ED%8A%B8&nca=%ED%85%8C%EC%8A%A4%ED%8A%B8

select distinct wr_parent from g4_local_write_test where ca_name = '??울??별??sfl=wr_10' and ((INSTR(, '테스트')) ) and (wr_num between '' and '10000')

1064 : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' '테스트')) ) and (wr_num between '' and '10000')' at line 1

error file : /test/bbs/board.php

해결할 방법이 있는지 도움을 부탁드립니다.